反应详情

Hydrogen chloride gas was introduced into a solution of 110.1 g of pyrocatechol in 370 ml of acetone for 2 hours while stirring and cooling with ice 10°-15° C. internal temperature, and then for an additional 30 minutes at 0° C. The mixture was poured into ice/water, made alkaline and extracted three times with 1 l of ether. The organic phase was washed neutral three times with 500 ml of water, dried over sodium sulfate and evaporated in vacuo. The residue was distilled in vacuo (b.p. 11 mm/59°-60° C.). There were obtained 39.0 g (26.0% of theory) of 2,2-dimethyl-1,3-benzodioxole.

1. temperaturecooling with ice 10°-15° C. internal temperature
2. extractionextracted three times with 1 l of ether
3. washThe organic phase was washed neutral three times with 500 ml of water
4. dry with materialdried over sodium sulfate
5. customevaporated in vacuo
6. distillationThe residue was distilled in vacuo (b.p. 11 mm/59°-60° C.)