A NEW METHOD FOR THE PREPARATION OF β-HYDROXYESTERS. THE TITANIUM TETRACHLORIDE-PROMOTED REACTION OF KETENE ALKYL TRIALKYLSILYL ACETALS WITH CARBONYL COMPOUNDS

Abstract
In the presence of TiCl4, ketene alkyl trialkylsilyl acetals, prepared from α-lithio esters and a trialkylsilyl halide, react with aldehydes and ketones at −78°C to afford the corresponding β-hydroxyesters and β-trialkylsiloxyesters in good yields.