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

1976-06-01

Todd, G. Thomas

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

C07D21174

Patent

active

039608751

ABSTRACT:
2,2,6,6-Tetramethyl-4-oxopiperidine is prepared from 2,2,4,4,6-pentamethyl-2,3,4,5-tetramethylpyrimidine (acetonine) by heating in the presence of acetone, diacetone alcohol or water. These regents may be used in excess or an organic solvent is added. The preferred modification is the heating of acetonine hydrate in an excess of acetone or in an acetone-methanol mixture to about 40.degree. to 65.degree.C for several hours. The use of diacetone alcohol permits higher reaction temperatures leading to shorter reaction times.

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

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