in benzene-d6 under Ar; in NMR tube; Fe complex and dialkyne (molar ratio 1:2) dissolved in benzene-d6; heated to 80°C for 1 h; s pumped off at reduced pressure; excess dialkyne removed by sublimationat 70°C; extd. with hexanes; filtered; solvent removed from filt rate in vac.; Fe complex contaminated with Pt complex (<= 5percent) obtained; detd. by NMR spectra;

in benzene-d6 byproducts: PEt3; under Ar; in NMR tube; Pt(PEt3)4 heated (60°C, 20 min) under vac.; Fe complex and dialkyne (molar ratio 1:1.5) added; dissolved in benzene-d6; heated to 90°C for 14 d; volatiles pumped off at reduced pressure; excess dialkyne removed by subllimation at 70°C; extd. with hexanes; filtered; solvent removed from filtrate in vac.; Fe complex contaminated with Pt complex (<= 5percent) obtained; detd. by NMR spectra;