METHOD FOR EXTRACTING ASYMMETRICΒ-DIKETONE COMPOUND FROMΒ-DIKETONE COMPOUND

摘要

The present invention is a method for extracting an asymmetricβ-diketone compound from aβ-diketone compound in which the asymmetricβ-diketone compound and at least one symmetricβ-diketone compound exist in a mixed state, said method comprising the steps of: (A) adjusting the pH value of a mixed solution of theβ-diketone compound and water to 11.5 or higher to cause theβ-diketone compound to be dissolved in water, thereby preparing aβ-diketone compound solution; and (B) subsequently adjusting the pH value of theβ-diketone compound solution to 9.5 or lower to collect an asymmetricβ-diketone compound represented by chemical formula (1) that is separated from theβ-diketone compound solution. In the present invention, substep (a) and/or substep (b) is involved: (a) a substep of setting the upper limit of the pH value of the mixed solution to 12.5 to prepare theβ-diketone compound solution, and then bringing the solution into contact with a hydrophobic solvent in step (A); and (b) a substep of setting the lower limit of the pH value of theβ-diketone compound solution to 8.0 in step (B).