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• W1963582887 abstract "Models of guaiacyl (G) and syringyl (S) subunits in lignin have been catalytically oxidized to their corresponding p-quinones in the presence of molecular oxygen. The oxidation of syringyl-like phenols readily occurred with 5-coordinate cobalt catalysts on which one of the ligands is a monodentate pyridine or imidazole base that coordinates axially to the metal. Formation of p-quinones with this system depends on the coordination of the axial base to the metal as influenced by its pKa and its size. The yield of p-quinones from guaiacyl models was markedly improved by the addition of a sterically hindered aliphatic nitrogen base that does not coordinate to the catalyst. A mechanism involving deprotonation of the phenol substrate by the bulky base is proposed." @default.
• W1963582887 created "2016-06-24" @default.
• W1963582887 creator A5034260298 @default.
• W1963582887 creator A5037761549 @default.
• W1963582887 date "2012-05-01" @default.
• W1963582887 modified "2023-10-14" @default.
• W1963582887 title "Catalytic oxidation of para-substituted phenols with cobalt–Schiff base complexes/O2—selective conversion of syringyl and guaiacyl lignin models to benzoquinones" @default.
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• W1963582887 doi "https://doi.org/10.1016/j.tetlet.2012.02.093" @default.
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