Process for producing cyclic ureas

Details Process for producing cyclic ureas Process for producing cyclic ureas

C - Chemistry, Metallurgy

07

D

260/255, 260/315

C07D 233/32 (2006.01) C07D 239/10 (2006.01) C07D 239/36 (2006.01) C07D 243/04 (2006.01)

Patent

CA 1283101

ABSTRACT OF THE DISCLOSURE A process for producing a cyclic urea by reacting a diamine directly with phosgene with a high yield and a cheap cost is provided, which process comprises reacting a diamine expressed by the Formula R-HN-R'-NH-R wherein R represents hydrogen atom or a lower alkyl group and R' represents dimethylene group, trimethylene group, tetramethylene group or a lower alkyl group-substituted dimethylene group, trimethylene group or tetramethylene group except for three particular combinations of R with R', with phosgene substantially in the presence of water and a dehydrochlorinating agent to obtain a cyclic urea expressed by the formula Image wherein R and R' are as defined above.

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