Sz. Zhang et al., EXCLUSIVE CIS-1,4-ADDITION REACTION IN THE BROMINATION OF 2,5-BIS(TRIMETHYLSILYL)THIOPHENE MONOOXIDE, Heterocycles, 48(2), 1998, pp. 227-234
2,5-Bis(trimethylsilyl)thiophene monooxide (1) underwent a 1,4-additio
n reaction with Br-2 to give stereospecifically 2,5-bis(trimethylsilyl
)-2,5-cis-dibromothiolene monooxide (2) in quantitative yield.