(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)
%0 Journal Article
%1 Sitzmann.1997
%A Sitzmann, Helmut
%A Dezember, Thomas
%A Kaim, Wolfgang
%A Baumann, Frank
%A Stalke, Dietmar
%A Kaercher, Joerg
%A Dormann, Elmar
%A Winter, Hubert
%A wachter, Christoph
%A Kelemen, Marc.
%D 1997
%J Angewandte Chemie, International Edition in English
%K 2 bromo carbonyl carbonyl;regiospecific complex;iron crystal cyclopentadienyl dimer;high dimer;redn elimination iron isopropylcyclopentadienyl prepn;mol propene radical redn spin structure
%N 23/24
%P 2872--2875
%R 10.1002/anie.199628721
%T High-spin cyclopentadienyl complexes. 1. Synthesis and characterization of the stable dicarbonyl(cyclopentadienyl)iron radical (C5R5)Fe(CO)2 (R = CHMe2)
%V 35
%X (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)
@article{Sitzmann.1997,
abstract = {(C5R4R')Fe(\textgreek{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(\textgreek{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(\textgreek{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)]},
added-at = {2019-07-15T13:41:23.000+0200},
author = {Sitzmann, Helmut and Dezember, Thomas and Kaim, Wolfgang and Baumann, Frank and Stalke, Dietmar and Kaercher, Joerg and Dormann, Elmar and Winter, Hubert and wachter, Christoph and Kelemen, Marc.},
biburl = {https://puma.ub.uni-stuttgart.de/bibtex/2ddb715d2b76e74fdface7e66628e8c35/b_schwederski},
doi = {10.1002/anie.199628721},
interhash = {a2fd26c7d1e6f77dcd50256b4190e4e4},
intrahash = {ddb715d2b76e74fdface7e66628e8c35},
issn = {0570-0833},
journal = {Angewandte Chemie, International Edition in English},
keywords = {2 bromo carbonyl carbonyl;regiospecific complex;iron crystal cyclopentadienyl dimer;high dimer;redn elimination iron isopropylcyclopentadienyl prepn;mol propene radical redn spin structure},
number = {23/24},
pages = {2872--2875},
timestamp = {2019-07-15T11:42:10.000+0200},
title = {High-spin cyclopentadienyl complexes. 1. Synthesis and characterization of the stable dicarbonyl(cyclopentadienyl)iron radical [(C5R5)Fe(CO)2] (R = CHMe2)},
volume = 35,
year = 1997
}