Process for the preparation of 2,2,6,6-tetramethyl-4-oxopiperidi

Details Process for the preparation of 2,2,6,6-tetramethyl-4-oxopiperidi Process for the preparation of 2,2,6,6-tetramethyl-4-oxopiperidi

1974-06-21

1976-04-27

Todd, G. Thomas

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

C07D21174

Patent

active

039534596

ABSTRACT:
2,2,6,6-Tetramethyl-4-oxopiperidine is prepared from 2,2,4,4,6-pentamethyl-2,3,4,5-tetrahydropyrimidine by treatment with an acidic catalyst. Suitable catalysts are Lewis acids, protonic acids and their salts with ammonia or organic bases. The reaction may be carried out in organic solvents, preferably in acetone, by gentle heating, for example at 40.degree. to 65.degree.C. Yields of 95% are obtainable after a reaction of several hours.

REFERENCES:
patent: 3513170 (1970-05-01), Murayama et al.

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