in toluene under protective gas; 2 mmol (Me3Si(Me3C)P)2 added to 2 mmol of the trans Pt-complex in toluene; mixt. heated to 80°C (2 d); the cis Pt-educt is formed intermediately; volatiles removed in vac. at 20°C; residue recrystd. from n-pentane at -20°C;

in tetrahydrofuran under protective gas; soln. refluxed for 1 wk; Pt compound not isolated, detected by (31)P-NMR;