The stereochemistry of organometallic compounds. Part V. Preferred conformations of tricarbonylmetal groups in some cis-tricarbonyl-(1-substituted indane)chromiums
- 1 January 1969
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in Journal of the Chemical Society B: Physical Organic
- p. 1210-1214
- https://doi.org/10.1039/j29690001210
Abstract
The n.m.r. spectrum of tricarbonyl-(trans-1,3-dimethylindane)chromium (I; M = Cr) shows separate signals for the four aromatic protons, the separation being sufficient for the spectra to be considered first order. The aromatic regions of the spectra of other cis-tricarbonyl-(1-substituted indane)chromiums show similar properties, in contrast to the spectra of the corresponding trans-isomers. The signal separation in the case of the cis-isomers is attributed to the tricarbonylchromium residue adopting a preferred conformation in which steric interactions with the bulky cis-substituent are minimised.Keywords
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