A highly regio‐ and stereoselective selenoxide elimination of 1,2‐bis[4‐(trimethylsilyl)phenylseleno]alkanes to give (E)‐alkenyl selenoxides and its mechanistic study

Oxidation of organo-selenium compounds (I) with MCPBA generates bisselenoxide intermediates which undergo elimination to give products (II) with high regio- and E/Z-selectivity.