diethoxymethyltributyltin affords a large variety of new α-stannylacetals, which are expected to have a high potential for selective organic synthesis when they contain labile or chiral alkoxy groups. The α-stannylacetals can be converted into the corresponding substituted α-stannyl-ethers by treatment with organoaluminium halides or by use of an acetyl chloride/Grignardreagent sequence. The study has concentrated
organometallic reagents to give chiral α-oxygenated organotins in high yields. The Lewis acid promoted ringopening of the these chiral α-tributylstannylacetals by organocopper reagents, allyltins or silylenol ethers has been considered to occur mainly according to an anti process (), the absolute configuration of the newly created centre being S when the reaction was performed with on the α-stannylacetal