反应详情

A solution of 15.2 g (100 mmol) of 2,3,6-trimethylhydroquinone in 150 ml of acetic acid and a 28.4 g (250 mmol) of 30% by weight aqueous hydrogen peroxide were simultaneously added dropwise to a stirred solution of 0.68 g (2.0 mmol) of iron 5,14-dihydrodibenzo[b,i][5,9,14,18]tetraaza[14]annulene, 2.52 g (2.0 mmol) of a 40% by weight aqueous solution of pentasodium diethylenetriaminepentaacetate and 0.5 ml of concentrated sulfuric acid in 50 ml of acetic acid at 40° C. with cooling. The reaction mixture was then subjected to steam distillation. The distillate was extracted by shaking with methylene chloride. The organic phase was shaken with aqueous sodium bicarbonate solution and then with water, separated from the aqueous phase, dried over magnesium sulfate, filtered and concentrated to a yellow oil, which slowly solidifed. 12.9 g (86%) of 2,3,5-trimethyl-p-benzoquinone were obtained in the form of yellow oily crystals.

1. temperaturewith cooling
2. distillationThe reaction mixture was then subjected to steam distillation
3. extractionThe distillate was extracted
4. stirringThe organic phase was shaken with aqueous sodium bicarbonate solution
5. customwith water, separated from the aqueous phase
6. dry with materialdried over magnesium sulfate
7. filtrationfiltered
8. concentrationconcentrated to a yellow oil, which