The Horner−Wittig reaction of sulfinylmethyl-substituted diphenylphosphane oxides 1−3 with aldehydes is reported. In a straightforward synthesis, (E)-vinyl sulfoxides 4 (R 1 = Ph), 5 (R 1 = Me) and 6 (R 1 = pTol) were formed, mostly with high configurational selectivity and in high yields. In less selective