Mitsuhiro Yoshimatsu and Junko Hasegawa
Addition of PhSeNa to the conjugate enyne sulfones 1, 11–18 occurred at the δ-position of the sulfonyl group to give the 4-phenylseleno-1-sulfonylbuta-1,3-dienes 10, 19–22, 24, 25 and 27 regio- and stereo-selectively.