期刊
INORGANICA CHIMICA ACTA
卷 484, 期 -, 页码 160-166出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.ica.2018.09.038
关键词
-
资金
- department of science and technology (DST), India [SR/S2/JCB-09/2011, EMR/2014/000502]
- DST-SERB
- Council of Scientific and Industrial Research (CSIR), India
Herein a new Ru-phosphine complex (1) with molecular formula [RuL(PPh3)Cl-2] is reported where L is a redox active pincer ligand 2,6-bis(phenylazo)pyridine. The isolated complex has been characterized by usual spectroscopic techniques including single crystal X-ray crystallographic analysis. Complex 1 efficiently catalyzes aerobic oxidation of a wide range of primary and secondary benzylic, allylic, heterocyclic, alicyclic alcohols under mild conditions and is found to be superior over several other Ru (0, +2 and + 3), Ru-H and Ru-PPh3 catalysts. Mechanistic studies indicate that a transient Ru-H intermediate is formed in the catalytic cycle which gets switched into a Ru-hydrazo intermediate via hydrogen-walking mechanism. The catalyst is regenerated by aerial oxidation producing H2O2 as a by-product.
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