Process for preparing benzophenone-azines

Details Process for preparing benzophenone-azines Process for preparing benzophenone-azines

1986-10-14

1988-02-23

Moyer, Donald B.

Organic compounds -- part of the class 532-570 series

Organic compounds

Amino nitrogen containing

C07C10916

Patent

active

047271906

ABSTRACT:
A process for continuously preparing benzophenone-azines comprising oxidizing benzophenone-imines with molecular oxygen or a molecular oxygen-containing gas in the presence of a copper halide catalyst is disclosed. The oxidation reaction is carried out in a multistage system under an oxygen partial pressure gradually decreasing from the former stage to the latter stage and at a conversion gradually decreasing from the former stage to the latter stage, while controlling the conversion so that the molar ratio of the benzophenone-imines to the copper halide in the final stage be maintained at 1 or more. By the process, the continuous reaction can stably be performed at a high conversion of the benzophenone-imines without involving insolubilization and sedimentation of the catalyst.

REFERENCES:
patent: 2870206 (1959-01-01), Meyer et al.
patent: 4079080 (1978-03-01), Hayashi
patent: 4347383 (1982-08-01), Isshiki et al.

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