Isocyanid‐ und Heteroallen‐verbrückte Metallkomplexe, IX. Di‐ und Trieisenkomplexe mit funktionellen Isocyanidbrücken

Isocyanide‐ and Heteroallene‐Bridged Metal Complexes, IX[1,2]. – Di‐ and Triiron Complexes with Functional Bridging IsocyanidesThe reactions of ten mainly functional isocyanide dichlorides RN = CCl2 with Na[FeCp(CO)2] in tetrahydrofuran give mono‐isocyanide derivatives [Fe2(Cp)2(CO)3CNR] (1 a–g) of [Fe‐Cp(CO)2]2 in which the isocyanide occupies a bridging position. In three cases also minor amounts of diisocyanide complexes [FeCp(μ‐CNR)CO]2 (2c, 2e, 8) have been isolated. The chlorocarbonyl‐substituted aryl isocyanide dichlorides and pentafluorophenyl isocyanide dichloride in addition suffer (CO)Cl/ and F/ metal exchange, respectively, with formation of μ3‐isocyanide‐bridged triiron complexes (4 a–c, 7) via the intermediates 5 and 6, 7 has been studied by X‐ray analysis.