Abstract A series of 1, 6-and 1, 7-bis (acylsilanes) have been prepared using a strategy of substitution of dihalo derivatives with a synthetic equivalent of the trialkylsilylcarbonyl anion. These bis (acylsilanes) could easily be converted, under Lewis acid activation, into cis-β- hydroxyacylsilanes or the corresponding α, β-unsaturated derivatives, by means of a completely stereoselective intramolecular aldol reaction.
![1,4-bis[2-(tert-butyldimethylsilyl)[1,3]-dithian-2-yl]butane Structure](https://image.chemsrc.com/caspic/314/241807-12-5.png)
![1,6-bis[tert-butyl(dimethyl)silyl]hexane-1,6-dione Structure](https://image.chemsrc.com/caspic/407/241807-27-2.png)
![1,5-bis[2-(trimethylsilyl)[1,3]-dithian-2-yl]pentane Structure](https://image.chemsrc.com/caspic/276/241807-13-6.png)
