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The method of Mesheheryakov, Chem. Abstr., 54, 24436d (1960) was employed. To a mixture of 19 g. (0.226 mole) of 2,3-dimethyl-2-butene and 2 g. of cupric sulfate is added at reflux a mixture of 51 g. (0.447 mole) ethyl diazoacetate and 19 g. of 2,3-dimethyl-2-butene. The resulting mixture is heated at reflux for 3 hours, cooled, filtered and distilled to afford 19.8 g. (26%) of the desired cyclic ester, B.P. 76°-77° (15 mm.)

1. additionTo a mixture of 19 g
2. temperatureat reflux
3. additiona mixture of 51 g
4. temperatureThe resulting mixture is heated
5. temperatureat reflux for 3 hours
6. temperaturecooled
7. filtrationfiltered
8. distillationdistilled
9. customto afford 19.8 g