A cyclometallated O,Oâ²-diphenyl aryloxy(chloro)neopentylideneâtungsten complex [graphic omitted]r)(OAr)(CHCMe3)Cl(OEt2)1 is able to carry out metathesis of phosphorous containing olefins; diallylphenyl phosphane is metathetized intramolecularly to give the corresponding phospholene derivative 2 and allyldiphenyl phosphane gives the corresponding bisphosphane 3.