ISSN:
0018-019X
Keywords:
Chemistry
;
Organic Chemistry
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Chemistry and Pharmacology
Notes:
The ligand (6,6′-dimethoxybiphenyl-2,2′-diyl)bis[3,5-di(tert-butyl)phenylphosphine] (1) forms an unexpectedly stable hydrido-bis-solvento complex of composition [RuH(isopropanol)2(1)]BF4, (2) under the conditions used in the enantioselective hydrogenation of pyrones. The structure of 2, determined by X-ray diffraction, represents the first well-characterized chiral five-coordinate bis-phosphine ruthenium-hydride complex stable as a solvento complex, and provides a structural link in the enantioselective pyrone hydrogenation cycle catalyzed by [Ru(OAc)2(1)]. Using the arene complex [RuH(p-cymene)(1)]BF4 (3), the chiral pocket of coordinated 1 is shown to be relatively rigid, via NMR spectroscopy. This is reflected in restricted rotation about one of the four P-[3,5-di(tert-butyl)phenyl] P—Cipso bonds at room temperature.
Additional Material:
3 Ill.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/hlca.19960790608
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