Carbon-13 NMR spectra of chromium pentacarbonyl carbenoid complexes |
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| Authors: | DJ Ciappenelli FA Cotton L Kruczynski |
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| Institution: | Department of Chemistry, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139 U.S.A.;Department of Chemistry, Texas A&M University, College Station, Texas 77843 U.S.A. |
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| Abstract: | The carbon-13 NMR spectra of six carbenoid complexes of the type (OC)5Cr-(CXX′) have been recorded. The carbenoid carbon atoms are all markedly deshielded (chemical shifts vs. TMS in the range ?271 to ?360). With only one minor inversion of uncertain significance, the chemical shifts correlate well with the expected ability of the X and X′ groups to engage in dative π bonding to the carbenoid carbon atom. The longitudinal relaxation times for both carbenoid and carbonyl carbon atoms in (OC)5CrC(CH3)(OC2H5)] are 1 – 2 sec. The chemical shift difference for carbonyl carbon atoms cis and trans to the carbenoid ligand is essentially invariant in the six compounds. |
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| Keywords: | Address correspondence to this author |
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