Journal
CATALYSIS COMMUNICATIONS
Volume 9, Issue 5, Pages 658-663Publisher
ELSEVIER
DOI: 10.1016/j.catcom.2007.07.016
Keywords
oxidative carbonylation; N,N '-diphenylurea; Schiff base; cobalt(II) complexes
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The oxidative carbonylation of aniline to N,N'-diphenyl urea was investigated by an efficient catalyst system comprising of Co(II)-Schiff base complex and a pyridine-type promoter. Effects of temperature, pressure, Schiff base ligands, catalyst loading and mole ratio of Co(II) complex to promoter on the catalytic activity were studied. When the reaction was carried out at 0.6 mol % of Co(II)salophen(OH)(2), Co(II)salophen(OH)(2)/4-picoline (mol) = 2:1, CO/O-2 (MPa) = 3:1, 150 degrees C, 7 h, the highest conversion of aniline and yield of N.N'- diplienyl urea were 85.3% and 79.2%, respectively. The mechanism based carbamoyl metal complex intermediate is also proposed. (c) 2007 Elsevier B.V. All rights reserved.
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