Process for the synthesis of 2,2,6,6-tetramethyl-4-oxopiperidine
AssigneesUniroyal Chemical Company, Inc., University of Connecticut
InventorsRussell E. Malz, Jr., Young-Chan Son, Steven L. Suib
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Abstract
A process for the synthesis of 2,2,6,6-tetramethyl-4-oxopiperidine is disclosed wherein the process comprises reacting in a liquid phase reaction mixture: A) at least one acetone compound, and B) at least one ammonia donor compound, in the presence of a catalytically effective amount of a crystalline aluminosilicate containing calcium.
Claims22
A process for the synthesis of 2,2,6,6-tetramethyl-4-oxopiperidine comprising reacting in a liquid phase reaction mixture:
- A) at least one acetone compound, and
- B) at least one ammonia donor which is a compound selected from an ammonium salt of an inorganic acid, an ammonium salt of an organic acid and mixtures thereof, in the presence of a catalytically effective amount of a crystalline aluminosilicate containing calcium.
A process for the synthesis of 2,2,6,6-tetramethyl-4-oxopiperidine comprising reacting in a liquid phase reaction mixture in a single step at a temperature maintained in the range of from about 20° to about 25° C.:
- A) acetone,
- B) ammonium nitrate, and
- C) ammonium hydroxide
- in the presence of a catalytically effective amount of a CaY zeolite;
- wherein the molar ratio of acetone to the combination of ammonium nitrate and ammonium hydroxide is within the range of from about 1:1 to about 20:1 and the amount of CaY zeolite is within the range of from about 0.01 to about 10% by weight of the acetone.
A process for the synthesis of 2,2,6,6-tetramethyl-4-oxopiperidine comprising reacting in a liquid phase reaction mixture at a temperature maintained in the range of from about 20° C. to about 25° C.:
- A) acetone,
- B) ammonium nitrate, and
- C) ammonia,
- in the presence of a catalytically effective amount of a CaY zeolite;
- wherein the molar ratio of acetone to the combination of ammonium nitrate and ammonia is within the range of from about 1:1 to about 20:1 and the amount of CaY zeolite is within the range of from about 0.01 to about 10% by weight of the acetone, and
- wherein the ammonia is in gaseous form and is continuously added to reaction mixture.
Dependencies are inferred from the claim text.