A method, with high yield and improved selectively, for making a 2-(.omega.-alkoxycarbonylalkanoyl)-4-butanolide and an alkaline metal salt thereof, an ester of .omega.-hydroxy-(.omega.-3)-ketoaliphatic acid as a novel compound and a derivative thereof, and a method for making the same are provided.

Un método, con la alta producción y mejorado selectivamente, para hacer un 2-(.omega.-alkoxycarbonylalkanoyl)-4-butanolide y una sal alcalina del metal de eso, un éster del ácido omega.-omega.-hydroxy-(.omega.-3)-ketoaliphatic-(.omega.-3)-ketoaliphatic como un compuesto de la novela y derivado de eso, y un método para hacer igual se proporcionan.

 
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