反应详情

(4-Isocyanatophenoxy)-acetic acid methyl ester 4 (15 g, 72.46 mmol) was added to ethylene glycol (30 ml) at room temperature. The reaction was exothermic and the temperature rose to 42° C. Later the reaction mixture was stirred at room temperature for 16 hours. Water (100 ml) was added and crude 5 was filtered, dried and purified by column chromatography on silica gel using chloroform as eluant to get pure 5 (16.17 g, 82.9%) as an off-white powder with an m.p between 85.5-87.5° C.

1. customrose to 42° C
2. filtrationcrude 5 was filtered
3. customdried
4. custompurified by column chromatography on silica gel