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Search for13C equilibrium isotope effects in dicyclopentadienyltricarbonyldirhodium

Authors
Journal
Journal of Organometallic Chemistry
0022-328X
Publisher
Elsevier
Publication Date
Volume
367
Issue
3
Identifiers
DOI: 10.1016/0022-328x(89)87055-x
Disciplines
  • Chemistry

Abstract

Abstract The interchange of the carbonyl groups in dicyclopentadienyltricabonyldirhodium (η 5-C 5H 5) 2Rh 2(CO) 3 ( 1) has been investigated by the method of isotopic perturbation of equilibrium. Neither direct integration of the signals of terminal and bridged CO carbons in the 13C NMR spectrum at 193 K nor measurement of the 13C chemical shift of the averaged CO signal in the spectrum at 298 K at different grades of 13CO enrichment indicated an isotopic perturbation. It is concluded that a 13C equilibrium isotope effect for the carbonyl groups in 1 is either nonexistent, or is too small to be detected by the method employed.

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