Journal of the Chemical Society, Dalton Transactions p. 1545 - 1550 (1987)
Update date:2022-09-26
Topics:
Hunter, Geoffrey
Weakley, Timothy J. R.
Weissensteiner, Walter
The variable-temperature 90.56-MHz (13)C-<(1)H> n.m.r. spectra of dicarbonyl(η6-benzene)(triphenylphosphine)chromium(o), (1), dicarbonyl(η6-hexamethylbenzene)(triphenylphosphine)chromium(o), (2), dicarbonyl(η6-hexaethylbenzene)(triphenylphosphine)chromium(o), (3), and dicarbonyl(η6-hexa-n-propylbenzene)(triphenylphosphine)chromium(o), (4), have been observed and a decoalescence in the triphenylphosphine subspectra of (2), (3), and (4), with ΔG200<*>ca. 38 kJ mol(-1), attributed to restricted rotation about the chromium-phosphorus bond.The steric requirements for intramolecular rotations for these complexes are visualised as two cones with a common apex at the centre of the chromium atom.The crystal and molecular structure of (4) has been determined and the co-ordinated hexa-n-propylbenzene has been found to adopt an all-distal alkyl group conformation.
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