M. Hariharasarma, C. H. Lake, C. Watkins
Jun 18, 1999
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Influential Citations
8
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Journal
Organometallics
Abstract
Both cis-tetracarbonylmolybdenum(0) and cis-dichloroplatinum(II) complexes of {(±)-6,6‘-[[1,1‘-biphenyl]-2,2‘-diylbis(oxy)]bis(dibenzo [d,f][1,3,2]dioxaphosphepin)}, 1, and {(±)-6,6‘-[[1,1‘-binaphthyl]-2,2‘-diylbis(oxy)]bis(dibenzo[d,f][1,3,2]dioxaphosphepin)}, 2, have been prepared. Atropisomerism of the ligands in these complexes has been investigated by variable-temperature 31P{1H} NMR spectroscopy. These studies demonstrate that all three diastereomers are present in solutions of the cis-tetracarbonylmolybdenum(0) complexes of both ligands in the slow exchange region, although the distribution of the diastereomers is strongly dependent on the nature of the ligand. The conformations proposed for the major complexes in solution are consistent with the solid-state conformations of the complexes, as determined by X-ray crystallography. Only two species are present in solutions of the cis-dichloroplatinum(II) complexes, and surprisingly, both appear to have the R*R*S*(S*S*R*) configuration. The different c...