Dicyclohexylcarbodiimide → N,N'-Dicyclohexylurea

Participants

Reaction Steps

α-Carboxymethoxy, ω-carboxymethyl polyoxyethylene (molecular weight about 4000) (20 g, 5 mmole), N-hydroxysuccinimide (4 g), and dicyclohexylcarbodiimide (DCC) (7 g) were dissolved in dimethylformamide (100 ml) and stirred overnight. The crystals of dicyclohexyl urea that formed were separated by filtration. To the filtrate, ethyl ether (400 ml) was added to precipitate a polyoxyethylene derivative of the activated ester (17 g). The precipitate was separated by filtration and then washed with ethyl ether.

Provenance & Evidence