Abstract
[HC(py) 3W(NO) 2(CO)](SbF 6) 2 is a feasible Lewis acid catalyst precursor for the addition of silylated C-nucleophiles to carbonyl compounds. The O-silylated adducts are easily isolated without aqueous work-up and the catalyst can be recycled. A remarkable solvent effect is found in the addition of TMS-CN to cyclohexanes.
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