Patent ID: 6872854

Claim:
A method of preparing a stabilizer complex which comprises reacting: a) a ketone of the structure: where R 1 and R 2 are selected from the group consisting of H, methyl, C 1 -C 20 alkyl, C 2 -C 20 alkenyl, aryl, aryl that is mono or poly substituted with C 1 -C 15 alkyl, C 1 -C 4 alkoxy, and phenylalkyl; b) an ester of the structure: where R 4 is selected from the group consisting of C 1 -C 5 alkyl, aryl, and aryl that is substituted with C 1 -C 4 alkyl, and R 3 is selected from the group consisting of aryl, substituted aryl, C 1 -C 20 alkyl, and C 2 -C 20 alkenyl; c) a base selected from the group consisting of calcium oxide, calcium hydroxide, barium oxide, barium hydroxide, potassium hydroxide, potassium oxide, sodium hydroxide and sodium oxide in the presence of a solvent selected from the group consisting of an aromatic hydrocarbon, alkyl or aryl ether, dialkylsulfoxide, or the same ester used for the reaction, to form a reaction mixture containing a stabilizer complex, d) contacting the reaction mixture containing the stabilizer complex with water, organic solvent or combination thereof to precipitate the stabilizer complex from the reaction mixture; and e) recovering the stabilizer complex, which is a salt of a metal selected from the group consisting of sodium, potassium, calcium and barium.