SEARCH Articles Figures Tables Acetals Mannich reaction Enantioselective ketenes Enantioselective reaction Keten acetal Ketene acetal Ketene reaction Ketene silyl acetals Mannich reaction Ketenes acetals Ketenes reactions Ketenes silyl acetals Mannich reaction enantioselective Mannich reactions enantioselectivity Mannich silyl ketene acetals Silyl acetate Silyl ketene acetals Silyl ketene acetals, reaction Silyl ketenes Silyl ketenes, reactions Silyl using Silylation reactions