反应详情

4-Cyanoisophthalic acid dimethyl ester 203 (1.70 g, 7.76 mmol) was dissolved in methanol (100 mL) and then treated with an aqueous solution of lithium hydroxide (2.0 g, 46.5 mmol) in 50 mL of water. The basic solution was stirred at ambient temperature for 1.5 hour. It was then poured into a 10% HCl solution. The solution was extracted with ethyl acetate and the combined extracts were dried over Na2SO4. Removal of solvent gave quantitative yield of 4-cyanoisophthalic acid 204: 1H NMR (400 MHz, CD3OD) δ 8.01 (d, J=8 Hz, 1H), 8.33 (dd, J=1.7 Hz, J=8 Hz, 1H), 8.73 (d, J=1.7 Hz, 1H).

1. extractionThe solution was extracted with ethyl acetate
2. dry with materialthe combined extracts were dried over Na2SO4
3. customRemoval of solvent