Restricted rotation about a metal-arene bond caused by the steric effects of proximal ethyl groups : stereodynamics of some complexes of 1,3,5-triethyl-2,4,6-tris(trimethylsilylmethyl)benzene

doi:10.1039/dt9910003337

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Restricted rotation about a metal-arene bond caused by the steric effects of proximal ethyl groups : stereodynamics of some complexes of 1,3,5-triethyl-2,4,6-tris(trimethylsilylmethyl)benzene

Published Jan 1, 1991 · DOI · J. A. Chudek, G. Hunter, R. MacKay

Journal of The Chemical Society-dalton Transactions

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Abstract

1,3,5-Triethyl-2,4,6-trineopentylbenzene 5 and 1,3,5-triethyl-2,4,6-tris(trimethylsilylmethyl)benzene 6 are considered as realistic role models for the intramolecular rotational behaviour of hexaethylbenzene in its metal complexes. Empirical force-field calculations are reported for the ten diastereomeric conformers of 5 and 6 which fall into four sets depending on the number of syn interactions. Variable-temperature 75.5 MHz 13C-{1H} NMR spectra have been recorded for dicarbonylthiocarbonyl-, dicarbonyl(η2-cis-cycloctene- and dicarbonyl(triphenylphosphine)-[η6-1,3,5-triethyl-2,4,6-tris(trimethylsilymethyl)benzene]molybdenum(0). Decoalescence phenomena are observed for the three complexes and line-shape-fitting studies gave the barriers for rotation about molybdenum–arene bond.

Study Snapshot

The steric effects of proximal ethyl groups restrict rotation about a metal-arene bond in 1,3,5-triethyl-2,4,6-tris(trimethylsilylmethyl)benzene complexes, affecting the intramolecular rotational behavior of

PopulationOlder adults (50-71 years)

Sample size24

MethodsObservational

OutcomesBody Mass Index projections

ResultsSocial networks mitigate obesity in older groups.

Restricted rotation about a metal-arene bond caused by the steric effects of proximal ethyl groups : stereodynamics of some complexes of 1,3,5-triethyl-2,4,6-tris(trimethylsilylmethyl)benzene

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