Process for the preparation of indoles

Details Process for the preparation of indoles Process for the preparation of indoles

1985-11-15

1988-02-23

Ceperley, Mary E.

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

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

203 28, 564437, C07D20908, C07D20912, C07C 8526

Patent

active

047271612

ABSTRACT:
A process for producing an indole which comprises reacting an aniline and a diol in the presence of a catalyst to produce a reaction mixture containing the indole, unreacted aniline and by-products, condensing the reaction mixture to obtain a liquid reaction product, recovering the unreacted aniline from the liquid reaction product, reducing the contents of specified by-products in the recovered aniline below specified levels and reutilizing the resulting recovered aniline. To reduce the contents of the specified by-products in the recovered aniline below specified levels, it is preferred to subject the liquid reaction product or an aniline fraction separated therefrom to a heat-treatment and then to distillation. In the above manner, the recovered aniline can be reutilized in the reaction without causing the activity of the catalyst to deteriorate.

REFERENCES:
patent: 3845072 (1974-10-01), Romano et al.
Patent Abstracts of Japan, vol. 8, No. 178, C-238 (1615), (Aug. 16, 1984) Kudou et al.
Patent Abstracts of Japan, vol. 7, No. 108, C-165 (1253) (May 11, 1983) Honda.

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