With  Na{HB(OMe)3} in  tetrahydrofuran  addn of Na{HB(OMe)3} to cis-chloro(methyl){bis(dicyclohexylphosphino)ethane}platinum(II) in THF with immediate cloudiness, after 3 h quenched by aq.NH4Cl; layers sepd., aq. layer extrd. with ether, solvent removal by evapn., resulting oil dissolved in min. of THF, 4 parts methanol added, crystn. at -10°C, suction filtrn.;