Patent ID: 6410795
Filing Date: 2002-06-25
Classification: C07C,Y02P

Abstract:
A method for the preparation of 1,3-diketones comprising the steps of:(A) providing a mixture of an alkali metal hydroxide, an aromatic hydrocarbon, and an alcohol having a boiling point of a least 100Â° C. at atmospheric pressure; (B) heating the mixture and removing non-alkoxide by-product formed by reaction of the alkali metal hydroxide and the alcohol, whereby a solution of an alkali metal alkoxide in the aromatic hydrocarbon is formed; (C) mixing a carboxylic acid ester with the solution of the alkali metal alkoxide; (D) adding a ketone and heating at a temperature in the range of 40-150Â° C. until the formation of 1,3-diketone is substantially complete; and (E) recovering 1,3-diketone from the reaction mixture.