Abstract
Aerial oxidation of diphenylmethanimine to benzophenone azine was carried out at room temperature in the presence of cuprous chloride and a monodentate pyridine, such as pyridine, γ-picoline, isoquinoline, or quinoline. Cupric chloride, hydroxide, and nitrate were inactive in the reaction, whereas CuCl 2KOH and Cu(OH) 2HCl were active in the presence of excess pyridine. Bidentate ligands, such as ethylenediamine and monoethanolamine, inhibited the oxidative coupling of imine. Using isoquinoline for the direct synthesis of azine from benzophenone, ammonia and molecular oxygen, the reaction temperature can be lowered and the catalysts recycled.
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