Add time:07/29/2019         Source:sciencedirect.com

The barrier to rotation around the bond between the formyl group and the complexed ring in para-dimethylamino-π-(tricarbonylchromium) benzaldehyde (I) was determined by 13C NMR spectroscopy at variable temperature and complete line shape analysis. The ΔG≠ value for the interconversion in I (8.6 kcal mol−1 is smaller than the corresponding value for the free arene(II) (10.2 kcal mol−1. This decrease can be attributed to a loss of conjugation in the complex and/or to an interaction between the formyl group and the Cr(CO)3 moiety in the transition state.

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