ferric chloride-DMF-complex in tetrahydrofuran; tetrachloromethane ((3-Furyl)((2-(phenylthio)-5-(trimethylsilyl)-4-pentynyl)oxy)carbene)pentacarbonylchromium was heated at 80°C for 8h. addn of FeCl3-DMF-complex; residue was solved in CCl4 and treated with CF3CO2H; stirring for 30 min; chromy. (silica gel, 3:10 EtOAc/hexane); H-NMR, 13C-NMR, m.p. elem. anal., mass spectrum;
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