Abstract: Organoselenium reagents are powerful tools for the preparation of small organic molecules.A simple preparation of polystyrene-supported(E)-1-bromo-2-selenoethylene was reported.In the presence of NiCl₂(PPh₃)₂ catalyst,polystyrene-supported(E)-1-bromo-2-selenoethylene reacted with different Grignard reagents to offer(E)-1,2-disubstituted ethenes or trisubstituted ethenes.The evident advantages of this reaction are easy operations,odorlessness,good yields of the products.

Key words: β-Selenovinyl bromide, Polysubstituted alkenes, Solid-phase synthesis