Abstract: Flash vacuum thermolysis of 1, 3-dioxolan-4-ones yields aldehydes and ketones as the major products as the result of apparent decarbonylation of a lactones formed by collapse of a 1, 3 dipole. When phenyl substituents are present, epoxides are also formed via the intermediacy of a carbonyl ylide.
![1,4-Dioxaspiro[4.5]decan-2-one,3-phenyl-结构式](https://image.chemsrc.com/caspic/290/5439-43-0.png)
