Oxidation of Benzoins with Pyridine N-oxide - SbC15 (1 : 1) Complexes+
نویسندگان
چکیده
When a mixture of a few benzoins and a pyridine N-oxide SbC15 (1 : 1) complex (Complex A) was boiled in nitromethane, the corresponding benzils were obtained in various yields dependent upon the kinds of substituents in each reactant. The yield of benzil becames higher by adding some tertiary amines. In this reaction, tribenzylamine is a good accelerator to promote it. When Complex A, 4-picoline N-oxide SbC15 (1 : 1) complex (Complex B) and 4-nitro-pyridine-SbC15 (1 : 1) complex (Complex C) were used as the oxidant of benzoin, the order of the reaction rate was as follows : Complex C>Complex A>Complex B The oxidation of benzoin with these pyridine N-oxide SbC15 (1 : 1) complexes seems to proceed according to the following there processes ; i) the oxidation by pyridine oxide SbC15 (1 : 1) complexes themselves ii) the oxidation by ƒ¿ -OSbC14 pyridines and iii ) the oxidation by the mixure of pyridine Noxides and antimony (I) chloride.
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