2,2'-azo-bisisobutyronitrile in neat (no solvent) under N2 atm. mixt. (OC)5WPPh(CH=CH2)2, PPh2H and 2,2'-azobis(isobutyronitrile) heated for 24 h at 75°C, excess PhP(CH=CH2)2 removed under high vac. after which (OC)5WPPh2H and AIBN added and mixt. heated for24 h at 75°C; oil dissolved in min. CH2Cl2 and CH3OH and refrigerated at 6°C;