反应详情

21 g of 2-chloro-3-hydroxy-p-anisaldehyde oxime are heated under reflux for 20 hours together with 400 ml of acetic anhydride. Thereupon, the reaction mixture is evaporated, the residue is treated with 300 ml of ice-water, stirred for 1 hour, decanted, the thus-cooled residue is partitioned between methylene chloride and water, the organic phase is dried over sodium sulfate, evaporated, the residue is dried in a high vacuum, chromatographed on 200 g of silica gel with methylene chloride and recrystallized from methylene chloride/petroleum ether. There is obtained 2-chloro-3-cyano-6-methoxyphenyl acetate of m.p. 97°-99°.

1. customThereupon, the reaction mixture is evaporated
2. additionthe residue is treated with 300 ml of ice-water
3. customdecanted
4. customthe thus-cooled residue is partitioned between methylene chloride and water
5. dry with materialthe organic phase is dried over sodium sulfate
6. customevaporated
7. customthe residue is dried in a high vacuum
8. customchromatographed on 200 g of silica gel with methylene chloride
9. customrecrystallized from methylene chloride/petroleum ether