(Z)-α-(Trimethylsilyl) α,β-Unsaturated Esters. Their Stereoselective Conversion into α,β- and β,γ-Unsaturated Esters and β,γ-Unsaturated Ketene Acetals

Article abstract of DOI:10.1021/jo00007a039

Deprotonation of methyl (Z)-α-(trimethylsilyl) α,β-unsaturated esters with lithium diisopropylamide (LDA) or with lithium hexamethyldisilazide (LHMDS) in the presence of hexamethylphosphoramide (HMPA) as an activator, followed by protonation of the interm