Hydrogenolysis of β-O-4 lignin model dimers by a ruthenium-xantphos catalyst

A Wu, BO Patrick, E Chung, BR James

Index: Wu, Adam; Patrick, Brian O.; Chung, Enoch; James, Brian R. Dalton Transactions, 2012 ,  vol. 41,  # 36  p. 11093 - 11106

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Citation Number: 56

Abstract

Hydrogenolysis reactions of so-called lignin model dimers using a Ru-xantphos catalyst are presented (xantphos= 4, 5-bis (diphenylphosphino)-9, 9-dimethylxanthene). For example, of some nine models studied, the alcohol, 2-(2-methoxyphenoxy)-1-phenylethanol (1), with 5 mol% Ru (H) 2 (CO)(PPh3)(xantphos)(18) in toluene-d8 at 135° C for 20 h under N2, gives in∼ 95% yield the C–O cleavage hydrogenolysis products, acetophenone (14) and ...