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STATEMENT OF THE PROBLEMS
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7r-complex abstraction acetic acid addition alcohol aldehydes aliphatic alkyl Amer Angew anion benzene bromine C-H bond carbanion carbon atom carbonium ion carbonyl carbonyl compounds cation CfiHs CH3 CH3 Characteristic IR absorption Chem chloride cleavage converted COOCH COOH COOR cyclic cycloaddition cyclopropyl decomposition derivatives diene dienophile double bond effect electron density electron-attracting electrophilic elimination enamines energy enol epoxide equilibrium ester ether example excited formation formed fragmentation H. C. Brown H3C CH3 halides hydride hydrocarbon hydrogen atom hydroperoxide ibid intermediate isolated isomerization isomers J. D. Roberts ketone leads mechanism methyl methylene molecule multiplet nitrogen non-classical nucleophilic attack obtained OCH3 OH OH olefins orbitals oxide oxygen phenyl polar proton racemic radical rate-determining step react reaction reactive rearrangement resonance ring salts singlet sodium solvent solvolysis stable starting material steric substituents synchronous takes place tertiary Tetrahedron Letters thermal transition triplet Wittig yields ylides