Preparation of 2,5-disilylated thiophene derivatives and their conversion to 2,5-dihalo derivatives

2,5-Disilylated thiophenes were prepared and readily oxidized with m-chloroperbenzoic acid (m-CPBA) to give the corresponding 1,1-dioxides. The thiophene dioxide was converted to 2,5-dihalogenothiophene dioxides with halogenating agents