in tetrahydrofuran N2 atmosphere; treatment of Pt-complex with equiv. amt. of Ph2PCH=CHPPh2 (room temp., IR minitoring, 2 h); pptn. on n-hexane addn.;

in tetrahydrofuran N2 atmosphere; treatment of Pt-complex with equiv. amt. of Ph2PCH=CHPPh2 (IR minitoring, 10 days); pptn. on redn. of vol. and n-hexane addn.;