Restricted rotation about arene-oxygen bonds in some 1,3-di-tert-butyl-2-methoxyarenedicarbonylphosphorus(III)chromium compounds

The 1 H nmr spectra of 1,3-di-tert-butyl-2-methoxybenzenedicarbonyltriphenylphosphinechromium ( 5 ) and some related compounds at low temperatures show the presence of two species which interconvert with free energy of activation near 50 kJ mol −1 . The species differ in the orientation of the metho...

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Bibliographic Details
Published in:Canadian journal of chemistry 1984-11, Vol.62 (11), p.2566-2569
Main Authors: Campi, Eva M, Gatehouse, Bryan M. K, Jackson, W. Roy, Rae, Ian D, Wong, Margaret G
Format: Article
Language:English
Subjects:
Applied sciences
Exact sciences and technology
Other techniques and industries
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Summary:The 1 H nmr spectra of 1,3-di-tert-butyl-2-methoxybenzenedicarbonyltriphenylphosphinechromium ( 5 ) and some related compounds at low temperatures show the presence of two species which interconvert with free energy of activation near 50 kJ mol −1 . The species differ in the orientation of the methoxy with respect to the chromium, since the same type of process is observed in a chelate complex in which a phosphinite ligand on chromium is also attached to the arene. Hindered rotation about the arene-chromium axis is not involved. The crystal structure of 5 shows the Ph 3 P anti to the methoxy and the O-methyl group proximal to chromium.
ISSN:0008-4042
1480-3291
DOI:10.1139/v84-438