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HIGH-PRESSURE NMR-STUDY OF IMINE HYDROGENATION CATALYZED BY RHODIUM(I) PHOSPHINE COMPLEXES - CHARACTERIZATION OF SPECIES PRESENT UNDER CATALYTIC CONDITIONS

TitleHIGH-PRESSURE NMR-STUDY OF IMINE HYDROGENATION CATALYZED BY RHODIUM(I) PHOSPHINE COMPLEXES - CHARACTERIZATION OF SPECIES PRESENT UNDER CATALYTIC CONDITIONS
Publication TypeJournal Article
Year of Publication1994
AuthorsBall, GE, Cullen, WR, Fryzuk, MD, Henderson, WJ, James, BR, Macfarlane, KS
JournalInorganic Chemistry
Volume33
Pagination1464-1468
Date PublishedMar
Type of ArticleArticle
ISBN Number0020-1669
KeywordsLIGAND, SYSTEMS
Abstract

A high-pressure NMR cell based upon the use of a sapphire NMR tube and simple valve design was constructed. The use of the cell to study the hydrogenation of imines under 1000-2000 psi of hydrogen mediated by [tertiary bis(phosphine)]rhodium(I) catalysts is described. Complexes of the type [{Rh(diphos)}2(mu-H)(mu-X)] (X = Cl, I, OMe), which are formed at these elevated hydrogen pressures, were characterized in situ, and the possible significance of these complexes in the catalysis is discussed. The dihydride cis-[RhH2(diphos)2]Cl, produced in a side reaction, was spectroscopically characterized at low temperature under 1200 psi of H-2.

URL<Go to ISI>://A1994NE10200040