In industrial production of ω-hydroxyaliphatic acid being an important intermediate for large cyclic lactone-based perfumes, using dicarboxylate ester which is inexpensive and readily obtainable, a method, with high yield and improved selectively, for making a 2-(ω-alkoxycarbonylalkanoyl)-4-butanolide and an alkaline metal salt thereof, an ester of ω-hydroxy-(ω-3)-ketoaliphatic acid as a novel compound and a derivative thereof, and a method for making the same are provided.
Condensation reaction of γ-butyrolactone with a dicarboxylate ester represented by the general formula (1) ROOC(CH2)nCOOR wherein n is an integer of 7 to 13 and R is an alkyl group forms a condensation solution containing an alkaline metal salt of 2-(ω-alkoxycarbonylalkanoyl)-4-butanolide represented by the general formula (3):
wherein n is an integer of 7 to 13, R is an alkyl group, and M is an alkaline metal; the solution is extracted with water or an aqueous alkaline solution and subjected to hydrolysis and decarboxylation to form an alkaline metal salt of ω-hydroxy-(ω-3)-ketoaliphatic acid represented by the general formula (5):
wherein n is an integer of 7 to 13 and M is an alkaline metal; and the compound is selectively and effectively separated and recovered and then acidified to form an ω-hydroxy-(ω-3)-ketoaliphatic acid represented by the general formula (10):
wherein n is an integer of 7 to 13.
在工业生产中,ω-羟基
脂肪酸是大型环内酯基香
水的重要中间体,利用价格低廉且容易获得的二
羧酸酯,一种高产率和改进选择性的方法,用于制造2-(ω-烷氧基羰基烷酰基)-4
-丁内酯及其碱
金属盐、提供了制造 2-(ω-烷氧基羰基烷酰基)-4
-丁内酯及其碱
金属盐、作为新型化合物的 ω-hydroxy-(ω-3)-ketoaliphatic acid 的酯及其衍
生物的方法。
γ-丁内酯与通式(1)ROOC(
CH2)nCOOR 表示的二
羧酸酯(其中 n 为 7 至 13 的整数,R 为烷基)的缩合反应形成含有通式(3)表示的 2-(ω-烷氧基羰基烷酰基)-4
-丁内酯的碱
金属盐的缩合溶液:
其中 n 为 7 至 13 的整数,R 为烷基,M 为碱
金属;该溶液用
水或碱性
水溶液萃取并进行
水解和脱羧,以形成通式(5)代表的 ω-羟基-(ω-3)-酮脂肪族酸的碱
金属盐:
其中 n 为 7 至 13 的整数,M 为碱
金属;并选择性地有效分离和回收该化合物,然后酸化形成通式 (10) 所代表的ω-羟基-(ω-3)-酮脂族酸:
其中 n 为 7 至 13 的整数。