Preparation and characterization of carbene complexes of iron from azolyl and thienyl precursors
- 1 January 1996
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in J. Chem. Soc., Dalton Trans.
- No. 23,p. 4431-4438
- https://doi.org/10.1039/dt9960004431
Abstract
Azolyl and thienyl iron(II) complexes have been synthesized by the addition of 1-phenylpyrazol-5-yllithium, 5-(4,5-dihydro-4,4-dimethyloxazolin-2-yl)-2-thienyllithium, 2-(4,5-dihydro-4,4-dimethyloxazolin-2-yl)-3-thienyllithium or 5-(2-pyridyl)-2-thienyllithium to [Fe(cp)(CO)2Cl](cp =η-C5H5). Protonation or alkylation of these precursor complexes yielded the corresponding amino(organo)-, organo(thio)- or heterometallacyclic alkoxy(amino)- and hydroxy(amino)-carbene complexes as well as compounds in which the ligand shows more pyridinium character. The molecular structures of the pyrazolyl complex [Fe(cp)(CO)2([graphic omitted]Ph)] and the pyrazolinylidene complex [Fe(cp)(CO)2([graphic omitted]Ph)][CF3SO3] have iron–carbon bond lengths of 1.981(2) and 1.969(5)Å respectively.Keywords
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