in water excess nitrile, room temp.;

in neat (no solvent) refluxed at 100°C for 1 h; hot filtered, pumped to dryness, treated with hot benzene, filtered, residue washed (petroleum ether), dried under vacuo (yields the cis-isomer), the same procedure with the benzene-soln. gave the trans-isomer; elem. anal.;

in water Ramberg, L., Ber. Dtsch. Chem. Ges. 1907, 40, 2578-2588; Hofmann, K. A., Bugge, G., Ber. Dtsch. Chem. Ges. 1907, 40, 1772-1778; stoich. amt. ofK2PtCl4 in min. H2O and PhCN stirred at room temp. for 1 week; ppt. collected, dried in air, dissolved in CH2Cl2, passed through Celite, evapd. in vac., extd. with hot C6H6 (residual solid was cis-PtCl2(PhCN)2), C6H6 ext., cooled to room temp. to yield trans-PtCl2(PhCN)2;

in benzonitrile stirring at 100°C for 1d; pptn. on cooling,elem. anal;;

benzonitrile in water; benzonitrile stirring of mixt. of K2(PtCl4) in water mit benzonitrile (molar ratio 1:10, 60.degre.C, 4 h), pptn.; sepn., extn. (CH2Cl2), removal of solvent, trituration with light petroleum (b.p. 40-50°C); extn. (CHCl3), cis isomer as solid residue, evap. of ext. to dryness (vac.), crystn. of trans isomer (benzene); t.l.c. (silica gel);

in not given excess nitrile;

in water stirred at 60°C for 6 h with a large excess of benzonitrile, pumped to dryness; extd. (CH2Cl2), soln. dried (Na2SO4, 2 h), filtered, taked to dryness (reduced pressure), treated with hot benzene, filtered, residue washed (petroleum ether), dried under vacuo, the same procedure for the benzene soln. gave the trans-isomer; elem.anal.;

in dichloromethane dropwise addn. of a CH2Cl2 soln. of the ethane to a CH2Cl2 soln. of the Pt complex with stirringreflux, 2 h, pptn.; filtration, washing (cold methanol, twice diethyl ether), drying under reduced pressure, elem. anal.;

in toluene suspn. of Pt complex in toluene heated under reflux until solid dissolved, filtered, filtrate treated with Fe complex, mixt. heated under refluxfor 5.5 h; evapd. under vac., residue washed with hexane, dissolved in CH2Cl2, hexane added, slowly evapd. at room temp., crystals collected, air-dried; elem. anal.;

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