A process for the preparation of a butyrolactone of the general formula ##STR1## where R.sup.1 is unsubstituted or substituted alkyl or phenyl and R.sup.2 to R.sup.6 are hydrogen or unsubstituted or substituted alkyl or phenyl, wherein a .gamma.-formylcarboxylic acid ester of the formula ##STR2## where R is lower alkyl, is treated with oxygen at an elevated temperature of 60.degree.-150.degree. C.
一种制备一般式为##STR1##的丁内酯的方法,其中R.sup.1是未取代或取代的烷基或苯基,R.sup.2至R.sup.6是氢或未取代或取代的烷基或苯基,其中γ-甲酰
羧酸酯的式子为##STR2##,其中R为低烷基,在60℃至150℃的高温下用
氧气处理。