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Title:

Ni-Catalyzed Cleavage of Aryl Ethers in the Aqueous Phase

Document type:
Journal Article
Author(s):
He, J. Y.; Zhao, C.; Lercher, J. A.
Abstract:
A novel Ni/SiO2-catalyzed route for selective Cleavage of ether bonds of (lignin-derived) aromatic ethers and hydrogenation of the oxygen-containing intermediates at 120 degrees C in presence of 6 bar H-2 in the aqueous phase is reported. The C-O bonds of alpha-O-4 and beta-O-4 linkages are cleaved by hydrogenolysis on Ni, while the C-O bond of the 4-O-5 linkage is cleaved via parallel hydrogenolysis and hydrolysis. The difference is attributed to the fact that the C fragments generated from hydrolysis of alpha-O-4 and beta-O-4 linkages can undergo further hydrogenolysis, while phenol (produced by hydrolysis of the 4-O-S linkage) is hydrogenated to produce cyclohexanol under conditions investigated. The apparent activation energies, Ea(alpha-O-4)
Congress title:
ISI Document Delivery No.: 065NC Times Cited: 7 Cited Reference Count: 33 He, Jiayue Zhao, Chen Lercher, Johannes A. graduate school (Faculty Graduate Center of Chemistry) of Technische Universitat Munchen; Elitenetzwerk Bayern (graduate school NanoCat); European Graduate School for Sustainable Energy J.H. gratefully acknowledges support from the graduate school (Faculty Graduate Center of Chemistry) of Technische Universitat Munchen and Elitenetzwerk Bayern (graduate school NanoCat). C.Z. is...     »
Journal title:
Journal of the American Chemical Society
Year:
2012
Journal volume:
134
Journal issue:
51
Pages contribution:
20768-20775
Fulltext / DOI:
doi:10.1021/ja309915e
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