The reactions of allyltrimethylsilane with dialdose derivatives occur, under catalysis by boron trifluoride etherale or titanium tetrachloride, with high stercosclectivity, thereby providing simple routes to the corresponding allyl carbinols. The sense of this Sakurai reaction is very dependent on the nature of the Lewis acid. The same aldehydes react with β- trimethylsilylethylidenetriphenylphosphorane to afford 3-trimethylsilylprop-1-ene-1-yl- ...
