反应详情

3.42 g of 4,5-dimethyl-1,3-dioxolen-2-one [compound of formula (III') in which R is methyl, prepared in accordance with the procedure described in Tetrahedron Letters, pages 1701-1704, (1972)] was dissolved in 150 ml of carbon tetrachloride. To the solution were added 5.34 g of N-bromosuccinimide and a catalytic amount of α,α'-azobisisobutyronitrile. The mixture was heated under reflux for 15 minutes. The reaction mixture was cooled with ice, and the insoluble materials were removed by filtration. The filtrate was concentrated under reduced pressure to give a syrupy residue. The residue was distilled under reduced pressure, and a fraction having a boiling point of 115° to 120° C./5 mmHg was recovered. Thus, 4.2 g (yield 73%) of the captioned compound having the following properties was obtained as a colorless liquid.

1. customprepared in accordance with the procedure
2. temperatureThe mixture was heated
3. temperatureunder reflux for 15 minutes
4. temperatureThe reaction mixture was cooled with ice
5. customthe insoluble materials were removed by filtration
6. concentrationThe filtrate was concentrated under reduced pressure
7. customto give a syrupy residue
8. distillationThe residue was distilled under reduced pressure
9. customwas recovered