Polarized ketene dithioacetals. 28. A new general highly stereoselective and regiospecific method for homologation of ketones to .alpha.,.beta.-unsaturated esters via .alpha.-oxoketene dithioacetals
Polarized ketene dithioacetals. 28. A new general highly stereoselective and regiospecific method for homologation of ketones to .alpha.,.beta.-unsaturated esters via .alpha.-oxoketene dithioacetals