Preparation of sila-functional 3-sila-1-thiacyclohexanes

First sila-functional heterocycles 7 and 9 with Si and S atoms in 1,3-position bearing the reactive X group at silicon (X = i-PrO, F) were prepared from the corresponding phenyl-protected cycle 6 in good yields via Ph-Si bond cleavage by electrophilic reagents. Treatment of the i-propoxy derivative 7 with LiAlH4 gave heterocycle 8 with Si-H bond.