| 摘要 |
PROBLEM TO BE SOLVED: To obtain the subject compound in high selectivity and yield in an industrially advantageous way using readily available and inexpensive raw materials by condensation reaction of a specific compound withγ-butyrolactone and an alkali metal alcoholate. SOLUTION: (A) A dicarboxylic ester of the formula ROOC(CH2 )n COOR ((n) is 7-13; R is an alkyl) (e.g. 1,12-dodecanediacid dimethyl ester) is agitated under heating followed by adding (B)γ-butyrolactone and (B) an alkali metal alcoholate (e.g. sodium methylate) to the component A to carry out a condensation reaction to obtain the objective compound. The reaction is pref. carried out under reduced pressures (pref. at 50-760 mmHg) while distilling the alcohol formed off the system; alternatively, for example, it is also preferable that, in the 1st step, a pressure is reduced under conditions enough to evaporate the alcohol formed, and in the 2nd step, the pressure is further reduced; namely, the pressure reduction is conducted in two or more steps.
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