Process for producing cyclic ureas
AssigneeMitsui Toatsu Chemicals, Inc.
InventorsNobuyuki Kajimoto, Teruyuki Nagata, Masaru Wada
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Abstract
A process for producing a cyclic diamine which comprises reacting a diamine of the formula R--HN--R'--NH--R (II) wherein R represents a lower alkyl group and R' represents a lower alkyl group-substituted dimethylene group, trimethylene group, a lower alkyl group-substituted trimethylene group, tetramethylene group or a lower alkyl group-substituted tetramethylene group with urea in the presence of a polar solvent and at 180.degree. C. or higher, to obtain a cyclic urea ##STR1## wherein R and R' are each as defined above, the production yield being more improved by carrying out the initial period reaction at 140.degree. C. or lower.
Claims6
In a process for producing a cyclic urea expressed by the formula (I) ##STR4## wherein R represents a lower alkyl group and R' represents a lower alkyl group-substituted dimethylene group, trimethylene group, a lower alkyl group-substituted trimethylene group, tetramethylene group or a lower alkyl group-substituted tetramethylene group, by reacting a diamine expressed by the formula (II)
- R--HN--R'--NH--R (II)
- wherein R and R' are each defined above, with urea, the improvement comprising carrying out the reaction in the ratio of diamine to urea of about equimole in the presence of a non-protonic polar solvent and at a temperature of 180.degree. C. or higher.
Dependencies are inferred from the claim text.