Zz. Huang et al., SYNTHESIS OF ALPHA-PHENYLSELENO CARBOMETHOXYMETHYLENE TRIPHENYLARSORANE AND ITS WITTIG-TYPE REACTION, Tetrahedron letters, 36(3), 1995, pp. 425-426
The first example of alpha-seleno arsonium ylide (3) was reported. It
has sufficient activity to undergo a Wittig type reaction, affording a
novel method for the stereoselective synthesis of (Z)-alpha-seleno-al
pha,beta-unsaturated compounds (5).