Trifluoroacetic acid-mediated hydrolysis

Palladium-mediated addition of silyl stannane reagents to alkynyl ethers has been employed for the synthesis of aliphatic acyl silanes in very good yields via the intermediate a-alkoxy-/J-stannyl vinyl silanes (enol ethers of acyl silanes)82. In a second palladium-catalysed step, the vinyl stannane moiety could be coupled to suitable halides before hydrolysis to the acyl silanes with trifluoroacetic acid (Scheme 11). 

Ethyl enol ethers of acyl silanes have been prepared by the palladium-mediated addition of silyl stannanes to alkynyl ethers. Hydrolysis using trifluoroacetic acid gave very high yields of acyl silanes (vide supra, Section m.A.4)82. 

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