Cobalt-Schiff base complex catalyzed oxidation of para-substituted phenolics. Preparation of benzoquinones

JJ Bozell, BR Hames, DR Dimmel

Index: Bozell, Joseph J.; Hames, Bonnie R.; Dimmel, Donald R. Journal of Organic Chemistry, 1995 , vol. 60, # 8 p. 2398 - 2404

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Citation Number: 135

Abstract

Para-substituted phenolics, serving as models for lignin (a renewable source of carbon), are oxidized to the corresponding benzoquinone with oxygen in the presence of catalytic amounts of Co-Schiff base complexes. The reaction products observed depend on the structure of the catalyst. The 5-coordinate catalysts (pyridine)[bis (salicylidene) ethylenediamine) cobalt [(pyr) Co (salen) l and [bis-[(salicylideneamino) ...