THE MICHAEL TYPE REACTION OF O-SILYLATED KETENE ACETALS WITH α,β-UNSATURATED CARBONYL COMPOUNDS PROMOTED BY TITANIUM TETRACHLORIDE

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Abstract
O-Silylated ketene acetals reacted with α,β-unsaturated carbonyl compounds at −78°C in the presence of TiCl4 or in the coexistence of TiCl4 and Ti(OPr-i)4 to afford the corresponding δ-ketoesters in good yields.