期刊
TETRAHEDRON
卷 60, 期 5, 页码 1065-1072出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.tet.2003.11.082
关键词
triruthenium dodecacarbonyl catalyst; catalytic dehydrogenation; alcohols; ligands; hydride acceptors
Dehydrogenation of alcohols into aldehydes and ketones by Ru-3(CO)(12)/PPh3 based homogeneous catalysis has been investigated as an alternative for the classical Oppenauer oxidation. Several catalytic systems have been screened in the Oppenauer-like oxidation of alcohols. A systematic study of various combinations of Ru-3(CO)(12), mono- and bidentate ligands and hydride acceptors was performed to enable dehydrogenation of primary alcohols to stop at the aldehyde stage. Among many H-acceptors screened, diphenylacetylene (tolane) proved the most suitable judged from its smooth reduction. Electron rich and deficient analogues of tolane have been synthesized and, based on competition experiments between these H-acceptors, a tentative catalytic cycle for the Ru-3(CO)(12)/PPh3-catalyzed dehydrogenations has been proposed. (C) 2003 Elsevier Ltd. All rights reserved.
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