反应详情

温度

60 °C

A mixture of 85.9 g (0.78 mole) of hydroquinone, 1200 ml of acetonitrile and 53.9 g (0.39 mole) of potassium carbonate is heated to 60° C., then a solution of 115.8 g (0.60 mole) of 2,5-dichloro-3-nitropyridine in 500 ml of acetonitrile is added dropwise over 6 hours and the mixture is stirred for 36 hours. The solvent is removed by distillation and the residue is poured into a mixture of ice-water and hydrochloric acid. After extraction with methylene chloride, the combined organic phases are dried over magnesium sulfate, treated with activated carbon, filtered and concentrated. The residue is purified by crystallisation in a mixture of hexane and ethyl acetate, affording 99 g (62% of theory) of 4-(5-chloro-3-nitropyridin-2-yloxy)phenol with a melting point of 125°-126° C.

1. customThe solvent is removed by distillation
2. additionthe residue is poured into a mixture of ice-water and hydrochloric acid
3. extractionAfter extraction with methylene chloride
4. dry with materialthe combined organic phases are dried over magnesium sulfate
5. additiontreated with activated carbon
6. filtrationfiltered
7. concentrationconcentrated
8. customThe residue is purified by crystallisation in a mixture of hexane and ethyl acetate