Organic Chemistry 1-Master The Concepts!

Explore alkanes, carbon-hydrogen compounds with carbon-carbon single bonds, including cyclic and acyclic varieties. Learn how normal and branched alkanes are named, and how cycloalkanes are formed and named.

Master naming branched alkanes by identifying the longest chain, numbering to place the first substituent at the lowest locant, and naming alkyl groups with yl endings alphabetically.

Learn to name cycloalkanes by counting ring carbons, choosing substituent prefixes, and applying numbering rules, including alcohol priority, to decide cycloalkane versus alkane names.

Classify carbons in alkanes as primary, secondary, tertiary, or quaternary by counting directly bonded carbons, and identify primary, secondary, and tertiary hydrogens accordingly with examples.

Explore constitutional and structural isomers of alkanes, comparing same-formula compounds with different arrangements, and identify primary, secondary, tertiary, and quaternary carbons.

Explore cis-trans isomerism in cycloalkanes, noting how ring constraints lock rotation and how cis or trans geometry is named for substituents such as isopropyl and methyl on cyclohexane.

Examine the conformations of alkanes and how rotation about the carbon-carbon sigma bond yields staggered and eclipsed forms. Understand h c h angles and the basis for their relative stability.

Master Newman projections of alkanes, drawing front and back carbons from a C-C bond, and identify eclipsed, staggered, and skew conformations.

Explore the conformational analysis of ethane, comparing eclipsed and staggered conformations from rotation about the C–C bond, and explain how dihedral angle and electron repulsion influence torsional strain.

Draw the propane Newman projection to analyze eclipsed and staggered conformations and compare their energies, noting greater repulsion in eclipsed conformations.

Explore Newman projections of butane, identifying eclipsed, totally eclipsed, gauche, staggered, and anti conformations through front and back carbon views, with dihedral angles of 0°, 60°, and 180°.

Explore conformational analysis of butane through rotations around carbon-carbon bonds, comparing anti, gauche, and eclipsed conformations and their energy differences.

Explore how angle strain and torsional strain arise in cycloalkanes, and how chair conformations reduce these strains by adjusting bond angles and minimizing eclipsing interactions.

Explore cyclohexane conformations, with chair as the most stable form, near-tetrahedral geometry, and reduced angle strain; ring flipping exchanges axial and equatorial hydrogens among conformations.

Explain the one- and three-diaxial interactions in cyclohexane derivatives and how ring flipping reduces repulsion, making equatorial substituents more stable, with examples like methyl and tert-butyl groups.

Explore the conformational change of methyl cyclohexane during ring flipping with Newman projections. Show why equatorial is more stable than axial and summarize key intermediates like boat and twist-boat.

Explore the conformations of disubstituted cyclohexane, including cis and trans arrangements at carbons one and three, ring flipping, axial and equatorial positions, and stability from diaxial interactions.

Analyze how cis and trans disubstituted cyclohexanes stabilize through axial and equatorial arrangements, ring flipping, and 1,3-diaxial interactions to determine the most stable conformer.

Explore polycyclic compounds where two or more rings join to form spiral, fused, or bridged systems, including cis and trans isomers of the fused system.

Explore stereoisomers by examining how identical bonds in a tetrahedral carbon can orient differently in space, with cis and trans examples illustrating same formula and bonds but different arrangements.

Define chiral molecules and enantiomers, examine mirror images and rotation effects, note non-superimposability, identify planes of symmetry, and recognize chiral centers or stereo centers in carbon and nitrogen.

Learn to distinguish enantiomers by assigning priorities to groups on a chiral center, then view with the lowest priority in the back to determine R or S configurations.

Learn to determine priorities for double and triple bonds, treating them as single bonds and ranking atoms by atomic number to assign configurations for chiral centers with four different groups.

Learn to draw fisher projections by rotating molecules so two groups face forward and two back, then use a cross to place horizontal front and vertical back groups, noting enantiomers.

Practice configuration assignment at chiral centers by converting Fisher projections to three-dimensional structures and applying priority rules.

Explore diastereomers and enantiomers as distinct stereoisomers, learn how mirror images can be non superimposable, and apply R/S priorities to determine configurations in chiral molecules.

Explore meso compounds, molecules with two chiral centers and an internal plane of symmetry, which are superimposable on their mirror image.

Explore the stereochemistry of butane conformations, showing rotation about a single bond creates mirror-image enantiomers in certain conformations, while the totally eclipsed form has a plane of symmetry affecting enantiomerism.

Examine conformational enantiomers that arise when a molecule lacks chiral centers but has mirror-image conformations that are non superimposable, with rotation around a single bond hindered by bromine and iodine.

Analyze how to determine relationships between stereoisomers by comparing mirror images to identify enantiomers, diastereomers, and non‑superimposable pairs using R/S configurations and projection methods.

Learn how plain polarized light distinguishes enantiomers by their clockwise or counterclockwise rotation, identify optically active chiral molecules, and distinguish optically inactive ones.

Explore how we define specific rotation from observed rotation alpha, tube length L, concentration c, and temperature, yielding a value for enantiomers that rotate light oppositely, regardless of configuration.

Explains how enantiomers rotate polarized light in opposite directions by equal amounts, and shows that a 50/50 R/S mixture cancels rotation to yield an optically inactive racemic mixture.

The section explains enantiomers share melting points, boiling points, and solubility, while diastereomers differ. It shows r/s assignments and notes a plane of symmetry makes C achiral with rotation zero.

Explore enantiomeric excess and optical purity, contrasting racemic and enantiomerically enriched mixtures, and learn to calculate ee and specific rotation from enantiomer percentages using the provided equations.

Explain how hydrogen adds to a chiral alkene from the top or bottom face to produce two enantiomeric products in equal amounts, forming a racemic mixture.

Explore substitution reactions by comparing sn2 and sn1 pathways, analyze substrates and leaving groups, and note how hydroxide or water nucleophiles shape mechanisms.

Explore alkyl halides, with fluorine, chlorine, bromine, or iodine bonded to sp3 carbons across primary, secondary, and tertiary types; define vinyl, aryl, allyl, and benzyl halides.

Name alkyl halides by selecting the longest chain with the halogen, numbering from the end closest to it, and noting chlorine and methyl locants; for example, tert butyl iodide.

Compare nucleophilicity and basicity by showing how lone-pair groups can act as nucleophiles or bases, with nucleophilicity tied to reaction rate and basicity to equilibrium constants.

Explore the SN2 mechanism, where a nucleophile attacks a carbon bearing iodine in a bimolecular substitution, with a polar transition state and rate depending on nucleophile and substrate concentrations.

Examine the energy diagram for an SN2 reaction, showing reactants, transition state, and products; relate activation energy and heat of reaction to the concerted, exothermic hydroxide substitution of iodide.

Demonstrates SN2 inversion of configuration via backside attack in a concerted transition state. Explains bromide leaving and product inversion, and why front-side attack is unstable and not observed.

Explore how nucleophile strength governs SN2 reaction rates, with stronger nucleophiles accelerating rate and weaker ones slowing it, illustrated by comparisons such as oh minus vs water.

Learn how solvent choice governs SN2 reactions, with strong nucleophile-solvent attraction slowing attack in protic water, while polar aprotic solvents like DMF accelerate the reaction by reducing solvation.

Examine how leaving group strength shapes SN2 reactions, showing that weaker carbon–leaving group bonds lower activation energy and shift charge in the transition state, with groups like br− and cl−.

The SN2 reaction rate decreases as the substrate becomes more crowded, from methyl bromide to t-butyl bromide, due to backside attack challenges and steric hindrance around the halogen-bearing carbon.

This lecture introduces the sn1 mechanism for substitution, describing a unimolecular rate-determining step forming a carbocation after leaving group bromide and rapid nucleophile attack.

Analyzes the SN1 energy diagram in three steps—bromide leaving to form a carbocation, fast nucleophilic attack, and rapid deprotonation—identifying the rate-determining first step and exothermic overall.

Explore how substrate structure affects SN1 reaction rates by examining carbocation stability, inductive effects, and hyperconjugation, and explain why tertiary alkyl halides react faster than secondary, primary, and methyl halides.

The lecture explains how solvent polarity and hydrogen bonding accelerate SN1 reactions, showing that protic solvents stabilize carbocation and leaving group, making rates higher than in aprotic solvents.

Explore the SN1 stereochemistry with a chiral tertiary alkyl halide, where a planar carbocation allows ethanol to attack from either face, yielding a racemic mixture of enantiomers.

Explore SN1 reaction on a ring, with methanol as nucleophile, showing 40% and 60% formation of two diastereomers from front- and back-side attack on a planar carbocation.

Examine how rearrangement in sn1 reactions converts a secondary carbocation to a more stable tertiary carbocation via hydride shift, producing multiple products and a major product when ethanol attacks.

Analyze SN1 reactions where tert-butyl bromide reacts with acetate to yield an ester. Carbocation formation makes moderate to weak nucleophiles effective, with protonation needed for neutral nucleophiles.

Secondary alkyl halides undergo sn2 with strong nucleophiles like hydroxide, and sn1 with weak nucleophiles such as water or methanol, involving backside attack or carbocation formation respectively.

The leaving group governs sn1 rate: bond cleavage forms a carbocation in the rate-determining step, followed by methanol attack and deprotonation, with larger, more stable leaving groups accelerating the reaction.

Explore why aryl and vinyl halides do not undergo SN1 or SN2 reactions, due to sp2 hybridization and strong carbon-halogen bonds, with resonance stabilization considerations.

Analyze SN1 reaction problems to determine which substrate undergoes solvolysis faster, considering secondary versus primary carbocation stability, leaving group ability (iodide vs chloride), and solvent as nucleophile.

Explore sample SN1 and SN2 reactions, predicting mechanisms, major products, and stereochemistry from nucleophile strength, carbocation rearrangements, and backside attack.

Compare sn2 and sn1 reactions, including kinetics and mechanisms, backside attack, carbocation formation, inversion versus racemic outcomes, and solvent effects.

Explore elimination reactions where bases remove hydrogen and a leaving group from adjacent carbons to form alkenes; learn how base strength and beta hydrogens influence products.

Explain the structures and stereoisomers of alkenes using ethylene to illustrate sp2 hybridization, sigma and pi bonds, and planar geometry; show how pi density yields cis/trans isomers and restricts rotation.

Classify alkenes by substituents on the carbon–carbon double bond, from mono- to tetra-substituted, and explain that increasing substituents and electron-donating groups raise stability via hybridization, while cis–trans hindrance modulates it.

Explore the E1 mechanism for a tertiary alkyl halide with a weak base like ethanol and heating; a first-order rate forms a carbocation, then beta-hydrogen removal yields an alkene.

Explore the energy diagram for E1 reactions, showing a mechanism from tert-butyl bromide forming a carbocation to beta-hydrogen elimination yielding a disubstituted alkene, exothermic and rate-determined by the first step.

The rate of E1 reactions increases from primary to tertiary alkyl halides as more substituted carbocations form, with the mechanism involving carbocation formation, beta-hydrogen removal, and pi bond formation.

The Zaitsev rule predicts the major alkene in elimination reactions. An E2 mechanism with a strong base removes beta hydrogens to form the more substituted, tri-substituted alkene, favored by increased stability.

Explains regioselectivity in e1 reactions and the two-step mechanism. Shows how removing a beta hydrogen by water forms the more substituted alkene as the major product via a tertiary carbocation.

Explore E1 elimination with carbocation rearrangements, showing how hydride or alkyl shifts convert secondary to tertiary carbocations, guiding which beta hydrogen elimination yields the major, more substituted alkene.

Larger leaving groups stabilize negative charge and lower activation energy in E1 reactions. Mechanism involves cleavage of the carbon–leaving group bond, carbocation formation, and beta-hydrogen elimination to form an alkene.

Explore how solvent choice shapes E1 reactions, showing methanol stabilizing the carbon cation and transition state via hydrogen bonding and electrostatic interactions, while acetone cannot stabilize.

Explore the competition between SN1 and E1 mechanisms as a tertiary carbocation formation drives substitution or elimination, influenced by solvent role (water, methanol, ethanol) and possible hydride shifts.

Explore the E2 mechanism, concerted elimination where a strong base removes a beta hydrogen from a tertiary alkyl halide to form an alkene, with rate depending on substrate and base.

Analyze the energy diagram for E2 reactions, a concerted one-step process where a strong base removes a beta proton, bromide leaves, forming an alkene via transition state with activation energy.

Explore how alkyl halide structure shapes e2 rates. A base removes a beta proton and bromide leaves, forming an alkene; rates rise with more substituted alkenes due to transition-state stability.

Explore regioselectivity and stereoselectivity in E2 reactions by showing how removal of different beta hydrogens by a strong base yields tri-substituted versus di-substituted alkenes, with the trans isomer predominating.

Explore how leaving group ability influences E2 reaction rates, with iodide fastest and fluoride slowest, due to greater stabilization of negative charge in the transition state.

Polar aprotic solvents accelerate E2 by boosting base reactivity and rapid beta-hydrogen removal, favoring more substituted alkenes; protic solvents like methanol hinder this rate by hydrogen bonding.

Compare E1 and E2 elimination mechanisms under weak and strong bases, noting methanol solvent prompts E1 while hydroxide drives E2, with carbocation rearrangements and formation of the most substituted alkene.

Compare e2 and e1 mechanisms, showing hydroxide-driven e2 is one-step with rate depending on substrate and base, while methanol-driven e1 is two-step with rate depending on substrate.

Explain how anti-coplanar (anti-periplanar) H and leaving group alignment enables E2 reactions, compare staggered and eclipsed conformations, and show lower activation energy for anti configurations.

Explore e2 eliminations on cyclohexane halides, comparing equatorial vs axial leaving groups, antiperiplanar beta hydrogen arrangements, and how anti-zaitsev and zaitsev products arise from ring flips.

Explore alkenes by examining carbon–carbon double bonds, sigma and pi bonds, and sp2 hybridization in ethylene, and note how bond length, energy, and polarity vary across cis, trans, and cycloalkenes.

Explore degrees of unsaturation, the number of hydrogens that can be added to form alkanes from alkenes, using pi bonds and the C, H, X, N formula.

Explain naming alkenes and cycloalkanes by selecting the longest chain containing the double bond, numbering from the end closest to the double bond, and detailing substituents and multiple double bonds.

Explore geometric isomers around carbon–carbon double bonds, including cis/trans and the E/Z nomenclature, priority rules, and why rotation is blocked at room temperature, with cycloalkane examples.

Learn how hydrogenation of alkenes, catalyzed by palladium, proceeds via syn addition and how substitution and heat of hydrogenation reveal relative energies and cis–trans stability.

Explore dehydrohalogenation by the E2 mechanism, where a strong base removes a beta hydrogen anti to the leaving group to form the most substituted alkene, with stereospecific outcomes.

Explore Zaitsev and Hofmann products in E2 eliminations of alkyl halides, showing how bulky bases favor the less substituted Hofmann alkene by removing beta hydrogens.

Master the E1 elimination: convert an alkyl halide with a weak base in methanol into the major, more substituted alkene via carbocation formation and beta hydrogen elimination.

Explore the dehalogenation of vicinal dibromides with iodide in acetone to form an alkene, and examine how same-side stereochemistry yields the product while other arrangements give a trans alkene.

Explore the addition reactions of alkenes, including hydrogenation, hydration, halogenation, halohydrin formation, hydroboration-oxidation, epoxidation, cyclopropanation, and oxidative cleavage, with mechanisms for each.

Explore the two-step hydrohalogenation of alkenes, where a proton adds to form a carbocation and bromide attacks to yield an alkyl bromide, with energy diagrams and activation energies.

Demonstrate markovnikov's rule in hydrohalogen and electrophilic addition to alkenes, showing hydrogen adds to the less substituted carbon and halogen to the more substituted one, leading to the major product.

Explore hydration of alkenes, where acid-catalyzed water adds across double bonds following Markovnikov's rule to yield alcohols, via protonation, carbocation intermediates, and nucleophilic water attack.

Explain oxymercuration-demercuration: convert alkenes to alcohols via mercury acetate and water, form a mercurinium intermediate, then demercuration with a hydride donor to give the alcohol following the Marconi rule.

Explore hydroboration-oxidation of alkenes, using borane reagents (BH3 or 9-BBN) and hydrogen peroxide in base to form alcohols via syn addition with retention of configuration.

Explain the anti addition halogenation of alkenes via a bromonium ion mechanism, showing how cis alkenes yield enantiomers while trans alkenes produce meso compounds.

Learn halohydrin formation from alkenes via a bromonium ion mechanism, where water acts as the nucleophile to open the three-membered ring, producing anti, regioselective halohydrins in unsymmetrical alkenes.

Master cyclopropanation of alkenes by carbenes, including dichlorocarbene, dibromocarbene, and diazomethane routes, and the Simmons–Smith method, with syn addition and stereochemical outcomes.

Learn how proxy acid epoxidizes alkenes to a three-membered epoxide with a carboxylic acid byproduct, via a concerted transition state and cis/trans stereochemistry outcomes.

Learn syn dihydroxylation of alkenes using potassium permanganate or osmium tetroxide to form 1,2-diols via syn addition, mechanism steps, and stereochemical implications.

this lecture presents anti dihydroxylation of alkenes, forming a three-member ring via proxy acid, then opening in acidic or basic solution to yield trans diols and equal enantiomers.

Learn how warm, concentrated potassium permanganate oxidatively cleaves alkenes, yielding ketones and carboxylic acids, with CO2 formed from highly oxidized carbons.

Explore ozonolysis of alkenes, where ozone cleaves the double bond to form two carbonyls. Note workups with dimethyl sulfoxide or zinc and water, and observe formaldehyde formation for terminal alkenes.

Learn how alkenes polymerize via free radical, cationic, and inorganic mechanisms, where monomers like styrene join into polymers, initiated by radicals, protonation, or nucleophilic attack.

Explore alkynes, their CnH2n-2 formula, and distinguish terminal and internal alkynes, emphasizing proper nomenclature—longest chain, triple-bond position, and substituents.

Master alkyne synthesis via dehydrohalogenation of dihalides using excess amide base in two E2 steps, converting dihalides to alkynes through alkene intermediates.

Learn how terminal alkynes form acetylide ions by deprotonation with strong bases. Understand why sp-hybridized conjugate bases are more stable than sp2 or sp3, guiding base choice for acetylide formation.

Explore the reactions of acetylide ions with alkyl halides, epoxides, and carbonyl compounds, including deprotonation to form acetylide, SN2 alkylation, epoxide opening, and carbonyl additions.

Explore the hydrogenation of alkynes, from catalytic hydrogenation to alkanes, to selective cis-alkene formation with Lindlar's catalyst, and trans-alkene synthesis via metal ammonia reduction.

Explore halogenation of alkynes with halogens like chlorine or bromine, forming halonium ion intermediates and anti-addition to yield trans-dihalide, and with a second equivalent produce a tetrahalide alkane.

Explore the hydrohalogenation of alkynes, adding two equivalents of hydrogen halide to form vinyl bromide and then geminal dibromide. Understand the mechanism, including Markovnikov addition, carbocation intermediates, and bromide attack.

Observe the hydration of alkynes, converting terminal and internal alkynes to ketones via water and sulfuric acid catalysis, enol formation, and enol-to-ketone tautomerization, with mechanism steps.

The lecture explains hydroboration of alkynes, showing anti-Markovnikov addition to internal and terminal alkynes and subsequent oxidation to ketones or aldehydes via enol intermediates.

Learn oxidative cleavage of alkynes using ozone in water to form carboxylic acids (and co2 for terminal alkynes) and permanganate under various conditions to yield diketones, carboxylic acids, or oxalates.

Explore the structures, nomenclature (common and IUPAC), and classifications of alcohols—primary, secondary, tertiary; including cyclic and phenol examples—and understand how hydrogen bonding drives their high boiling points.

Alcohols can lose a proton to form alkoxide ions; phenol is more acidic than cyclohexanol because the negative charge on oxygen resonates across the aromatic ring, stabilizing the anion.

Explore organometallic reagents, including organolithium reagents, Grignard reagents, and organocopper reagents, and how polar carbon–metal bonds create strong nucleophiles and drive acid–base reactions with acetylene, water, and methanol.

Explore how organo lithium reagents convert carbonyl compounds into alcohols via nucleophilic attack and alkoxide formation, followed by protonation with water, with aldehydes yielding secondary alcohols.

Explore Grignard alcohol synthesis: alkyl halides react with magnesium in ether, add to carbonyls, then protonate to form primary, secondary, or tertiary alcohols, including stereochemistry and epoxide routes.

Explore the reduction of aldehydes and ketones to alcohols via hydride transfer from bh4− to the carbonyl carbon, followed by protonation from water to form the alcohol.

Explore the reactions of alcohols, including oxidation to ketones, aldehydes, and acids. Examine substitution, dehydration to alkenes, reduction, and the formation of esters and ethers, including steps with alkyl halides.

Explore oxidation of all alcohols to aldehydes, ketones, or carboxylic acids with different oxidants. Primary alcohols become aldehydes or acids; secondary alcohols become ketones; tertiary alcohols do not oxidize.

Convert alcohols to alkyl tosylates with tosyl chloride and base, creating a superb leaving group for SN2 substitutions with inversion or E2 eliminations to give ethers, bromides, nitriles, or amines.

Convert alcohols to alkyl halides using hydrogen halides via sn2 for primary and sn1 for secondary/tertiary; protonation forms water, leaves, halide attacks, giving inversion for primary and racemic for tertiary.

Explains how Lucas reagent (ZnCl2 and HCl) converts alcohols to alkyl chlorides, outlining primary through SN2 or secondary/tertiary through SN1 pathways and the resulting inversion.

Convert primary and secondary alcohols to alkyl bromide using phosphorus three bromide, with inversion at the carbon and a leaving group driven mechanism, while tertiary alcohols cannot react.

Convert primary and secondary alcohols to alkyl chlorides with thionyl chloride, using proline as base; sn2 inversion occurs at the carbon, forming chloride and SO2.

Explore dehydration of alcohols under sulfuric acid, where primary follows E2 and secondary or tertiary follow E1 to form the more substituted alkene per Saytzeff's rule.

Explain how dehydration of alcohols forms carbocations that rearrange via one- and two-hydride shifts or alkyl shifts to yield stable tertiary carbocations, leading to major and minor alkenes through elimination.

Dehydrate alcohols with POCl3 in the presence of pyridine to form alkenes via a phosphate ester intermediate, involving nucleophilic attack, chloride departure, and beta-elimination.

Under acid and heat, a diol with two adjacent carbons undergoes the pinacol rearrangement to yield a ketone, via protonation, water loss, a 1,2-shift, and deprotonation.

Understand the structure and nomenclature of ethers, epoxides, and sulfides, including common and IUPAC naming. Compare hydrogen bonding and dipole-dipole interactions; explore ethers as solvents and crown ethers in reactions.

Explore Williamson ether synthesis: convert alcohols to alkoxides, then SN2 attack on alkyl halides (or tosylates) to form ethers, prioritizing less hindered halides to avoid elimination.

Explore bimolecular dehydration of alcohols to synthesize ethers under strong acid and heat, where two equivalents form ether and water, while one equivalent yields an alkene.

Explore electrophilic addition of alcohols to alkenes in acid to form ethers via protonation, carbocation formation, and attack by the alcohol, noting possible rearrangements and the Alcock steamer Croatian approach.

Explore the alkoxymercuration-demercuration reaction that forms ethers from alkenes using mercury acetate and methanol. Observe markovnikov fashion via a mercurinium intermediate with anti addition and no carbocation rearrangement.

Learn how ethers react with two equivalents of hydrohalic acids to form two alkyl halides via protonation, water as leaving group, and stable carbocation intermediates.

The lecture shows how alkenes undergo epoxidation with a proxy acid to form a three-membered epoxide via a concerted oxygen transfer, with stereochemistry yielding meso or racemic products.

Explore how halohydrins form epoxides under base, as hydroxide deprotonates to an alkoxide and intramolecularly displaces the leaving group X−, with water acting as a base and forming byproducts.

Explore acid-catalyzed opening of epoxides, where protonation creates a leaving group, leading to ring opening by nucleophiles at the more substituted carbon and relief of angular strain.

Explore base-catalyzed opening of epoxides by metal oxide nucleophiles attacking the less substituted carbon, forming ether and alcohol, with water or ethanol protonation yielding enantiomeric racemic products.

Explore organometallic reactions with epoxides, where alkali metal reagents open rings via a polar carbon–metal bond to form alcohols after aqueous workup.

Epoxides react with lithium aluminum hydride through a hydride attack on the less substituted carbon, opening the ring and yielding alcohol after water protonation, driven by relief of angular strain.

Explore sulfides (thioethers), compounds with two groups bonded to sulfur, via sn2 synthesis from an alkyl halide with hydroxide, inversion, sulfonium formation, and ozone oxidation to dimethyl sulfoxide and carbonyls.

Examine the structure and formation of radicals via hemolytic cleavage, including C-H bond energy and primary–secondary–tertiary stability trend, with alkyl groups and orbital interactions driving reactivity toward bonds and oxygen.

Radical halogenation of alkanes replaces a C–H with a halogen under light or heat, yielding alkyl halides via initiation, propagation, and termination steps with chlorine radicals.

Draws an energy diagram for radical propagation, showing exothermic steps: C–H bond cleavage and chlorine attack form radicals, followed by alkyl chloride formation; alpha radical instability accelerates the second step.

Explore radical halogenation mechanisms producing product mixtures from primary and secondary hydrogens. Explain chlorine yields 50/50 while bromine favors secondary hydrogens through radical stability.

Explain how NBS generates bromine radicals that abstract allylic hydrogens to form resonance-stabilized allylic radicals, leading to two possible C–Br products from different allylic positions.

Explore radical addition of HBr to alkenes under light or peroxides, where bromine adds to the less substituted carbon, forming a secondary radical, then hydrogen transfers to give anti-markovnikov alkyl bromide.

Demonstrates radical substitution mechanisms: photolysis of Br2 forms bromine radicals that abstract hydrogens to give tertiary or benzylic radicals, guiding selective C–Br formation via resonance stabilization.