Abstract Reaction of 2-phenylsulphonyl oxiranes (1) with butyllithium in the presence of chlorotrimethylsilane gave 2-phenylsulphonyl-2-trimethylsilyl oxiranes (2), which on treatment with MgBr 2 Et 2 O gave 2-bromoacylsilanes (3) and either bromovinyl sulphones (5) or α, β-unsaturated acylsilanes (6) and 2-trimethylsilyl car☐ ylic acids (7), depending on structure.
