Advanced Organic Chemistry: Reactions and synthesisPlenum Press, 1990 - Chemistry, Organic |
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Page 16
... steric hindrance on the two faces of the enolate . The electrophile will approach from the less hindered of the two faces , and the degree of stereoselectivity will depend upon the degree of steric differentiation . Entries 1 , 5 , and ...
... steric hindrance on the two faces of the enolate . The electrophile will approach from the less hindered of the two faces , and the degree of stereoselectivity will depend upon the degree of steric differentiation . Entries 1 , 5 , and ...
Page 242
... steric bulk . The trends in the table illustrate the increasing importance of steric approach control as both the hydride reagent and the ketone become more highly substituted . The alkyl- substituted borohydrides have especially high ...
... steric bulk . The trends in the table illustrate the increasing importance of steric approach control as both the hydride reagent and the ketone become more highly substituted . The alkyl- substituted borohydrides have especially high ...
Page 326
... steric effects on the rate of rearrangement have been observed and can be accommodated by the chairlike transition ... steric interactions with R are relieved as the C - O bond stretches . The rate acceleration would reflect the higher ...
... steric effects on the rate of rearrangement have been observed and can be accommodated by the chairlike transition ... steric interactions with R are relieved as the C - O bond stretches . The rate acceleration would reflect the higher ...
Contents
Alkylation of Nucleophilic Carbon Enolates and Enamines | 1 |
CONTENTS | 3 |
Polar Addition and Elimination Reactions | 6 |
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acetic acyl adduct alcohols aldehydes alkenes alkyl allylic amines anion aromatic aryl boron bromide C=C H C₂H carbanions carbon carbonyl carbonyl compounds carbonyl group carboxylic acids catalyst CH,O CH₂ CH₂OH CH3 CH CHAPTER 6 CYCLOADDITIONS Chem chiral chloride Claisen rearrangement CO,CH CO₂C₂H CO₂H cyclic cycloaddition reactions Diels-Alder reactions diene dienophile double bond E. J. Corey electron electrophilic ENAMINES enantioselectivity enol ether epoxides esters examples formation FUNCTIONAL GROUPS give Grignard reagents H CH H H H H H,C H,C CH H,C H,C H. C. Brown H₁C H₂ H₂C H₂O halides halogen hydride hydrogen hydroxyl intermediate intramolecular ketones Lewis acid lithium mechanism methyl molecules n-BuLi organoboranes organolithium organometallic oxidation oxygen Ph Ph PhCH₂O proton radical react reaction conditions REACTIONS INVOLVING reactive ring Scheme SECTION solvents step stereochemistry stereoselectivity steric structure Synth synthesis synthetic Tetrahedron Lett THERMAL ELIMINATIONS transition metal UNIMOLECULAR REARRANGEMENTS ylides