Et2NH; copper(l) iodide in tetrahydrofuran (Ar); CuI was added to suspn. of Pt complex in THF/Et2NH at 0°C; ethyne was bubbled through mixt. for 2 h; solvent removed (vac.); residue dissolved in CH2Cl2; washed (H2O); org. phase dried (MgSO4); filtered; filtrate passed through alumina; solvent removed; recrystd. (CH2Cl2/ether); dried (vac.);