Paper 2: Subject Code 1018
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Delocalized Covalent Bonding; annulenes, azulenes, tropolones, fulvenes, sydnones; aromaticity, anti-aromaticity
(i) Reaction mechanisms: General techniques for studying organic reaction mechanisms, including kinetic and non-kinetic approaches, include isotopes, method cross-over experiments, intermediate trapping, stereochemistry, activation energy, thermodynamic control, and kinetic control.
(ii) Reactive intermediates: formation, structure, stability, and interactions between free radicals, carbenes, benzynes, nitrenes, and carbonium ions and carbanions.
(iii) Substitution reactions: SN 1, SN 2, and SN I; adjacent group involvement; aromatic compound electrophilic and nucleophilic reactions, including heterocyclic compound reactions involving pyrrole, furan, thiophene, and indole.
(iv) Elimination reactions: acetate pyrolysis, Chugaev and Cope eliminations; Saytzeff and Hoffmann orientation in E2 processes; E1, E2, and E1cb mechanisms.
v) Addition reactions: nucleophilic addition to C=O, C=N, conjugated olefins, and carbonyls; electrophilic addition to C=C and C≡C.
(vi) Responses and Modifications:
(a) Rearrangements of Wagner—Meerwein, Hoffmann, Beckmann, Baeyer-Villiger, Favorskii, Fries, Claisen, Cope, Stevens, and Pinacol-pinacolone.
(b) Benzoin, acyloin, and Stobbe condensations; Fischer indole synthesis, Skraup synthesis, Bischler-Napieralski, Sandmeyer, Reimer-Tiemann, and Reformatsky reactions; Aldol condensation, Claisen condensation, Dieckmann, Perkin, Knoevenagel, Witting, Clemmensen, Wolff-Kishner, Cannizzaro, and von Richter reactions.
Examples and classification of pericyclic reactions The FMO method, sigmatropic shifts [1, 3; 3, 3 and 1, 5], electrocyclic processes, and cycloaddition reactions [2+2 and 4+2] are all governed by the Woodward-Hoffmann principles.
(i) Polymer preparation and properties: polyethylene, polystyrene, polyvinyl chloride, teflon, nylon, terylene, and synthetic and natural rubber are examples of organic polymers. (ii) Biopolymers: Protein, DNA, and RNA structures.
OsO4, HlO4, CrO3, Pb(OAc)4, SeO2, NBS, B2H6, Na-Liquid NH3, LiAIH4, NaBH4, n-BuLi, and MCPBA are examples of synthetic reagent uses.
Simple organic compound excited and ground states, singlet and triplet states, and Norrish-Type I and Type II reactions are all examples of photochemistry.
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