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

1976-05-25

Todd, G. Thomas

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

C07D21174

Patent

active

039592952

ABSTRACT:
2,2,6,6-Tetramethyl-4-oxopiperidine is prepared from acetone and ammonia in the presence of acidic catalysts. Suitable catalysts are Lewis acids, protionic acids and their salts with ammonia or with organic bases, as for example BF.sub.3, NH.sub.4 Cl or H.sub.2 SO.sub.4. The addition of an alcohol such as methanol as well as the use of a cocatalyst may promote the reaction. The process may be carried out in two steps, in the first of which the temperature is held below 35.degree.C. In the second step a further amount of acetone is added and the temperature is rised to about 40.degree. to 65.degree.C.

REFERENCES:
patent: 3513170 (1970-05-01), Murayama et al.
Chem. Abstracts, 70:114968x, (1969).

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