OXIDATIVE ADDITION OF HALOGENOPENTAMETHYLCYCLOPENTADIENES TO METAL-CARBONYLS - A SIMPLE METHOD FOR THE SYNTHESIS OF (ETA-5-PENTAMETHYLCYCLOPENTADIENYL)METAL HALIDES

Oxidative Addition of Halogenopentamethylcyclopentadienes to Metal Carbonyls: A Simple Method for the Synthesis of (η5‐Pentamethylcyclopentadienyl)metal Halides The alkyl halides 5‐chloro‐1,2,3,4,5‐pentamethyl‐1,3‐cyclopentadiene (1), 5‐bromo‐1,2,3,4,5‐pentamethyl‐1,3‐cyclopentadiene (2) and 5‐iodo‐1,2,3,4,5‐pentamethyl‐1,3‐cyclopentadiene (3) add oxidatively to the metal centres of carbonyl complexes of group‐8 elements. Thus, 1 and 2 react with Fe(CO)5 to give compounds of the type (C5Me5)Fe(CO)2X (X = Cl, Br) (4, 5). Irradiation of Ru3(CO)12 together with 1 and 2 yields the compounds (C5Me5)Ru(CO)2X (X = Cl, Br) (6, 7). Reaction of 1, 2, and 3 with Co2(CO)8 and Ni(CO)4 leads to halide‐bridged dinuclear complexes of the type [(C5Me5)MX]2 (M = Co, Ni; X = Cl, Br, I) (8–12). Copyright © 1990 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim