Abstract Oxidation of 2, 2, 5-trimethyl-5-phenylseleno-1, 3-dioxan-4, 6-dione with m- chloroperbenzoic acid in methylene chloride gives a solution containing 2, 2-dimethylspiro [1, 3-dioxan-5, 2'-oxiran]-4, 6-dione and the unstable 2, 2-dimethyl-5-methylene-1, 3-dioxan- 4, 6-dione, which forms stable adducts with cyclohexadiene and cyclopentadiene. Flash vacuum pyrolysis of the cyclopentadiene adduct over the temperature range 460-570 and ...
![2',2'-dimethyl-spiro[bicyclo[2.2.1]hept-5-ene-2,5'-[1,3]dioxane]-4',6'-dione Structure](https://image.chemsrc.com/caspic/057/61245-07-6.png)
![bicyclo[2.2.1]hept-2-ene-5,5-dicarboxylic acid Structure](https://image.chemsrc.com/caspic/061/62705-70-8.png)
