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High-spin cyclopentadienyl complexes. 1. Synthesis and characterization of the stable dicarbonyl(cyclopentadienyl)iron radical (C5R5)Fe(CO)2 (R = CHMe2)

, , , , , , , , , and . Angewandte Chemie, International Edition in English, 35 (23/24): 2872--2875 (1997)
DOI: 10.1002/anie.199628721

Abstract

(C5R4R')Fe(m-Br)2Fe(C5R4R') (R = iPr; R' = H, iPr) were prepd. and reacted with CO to give (C5R4R')Fe(CO)2Br, which were reduced by Na amalgam or K to give various products, among which was the radical (C5R4R')Fe(CO)2 (R' = iPr). High-spin Fe2+ was found in (C5R4R')Fe(m-Br)2Fe(C5R4R') with 4 unpaired electrons and parallel spin coupling of the 2 d6-Fe2+ centers within one dimer. Redn. of (C5R4R')Fe(CO)2Br (R = H) by Na amalgam gave (C5R4H)Fe(m-Br)2Fe(C5R3H2) by regiospecific propene elimination. The radical (C5R4R')Fe(CO)2 (R' = iPr) is monomeric in soln. but dimeric in the solid state as detd. by x-ray crystallog. on SciFinder(R)

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