C - Chemistry – Metallurgy – 07 – D
Patent
C - Chemistry, Metallurgy
07
D
260/255, 260/315
C07D 233/32 (2006.01) C07D 239/10 (2006.01) C07D 243/04 (2006.01)
Patent
CA 1286291
ABSTRACT OF THE DISCLOSURE 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°C or higher, to obtain a cyclic urea (I) Image wherein R and R' are each as defined above, the production yield being more improved by carrying out the initial period reaction at 140°C or lower.
538549
Kajimoto Nobuyuki
Nagata Teruyuki
Wada Masaru
Kajimoto Nobuyuki
Marks & Clerk
Mitsui Toatsu Chemicals Inc.
Nagata Teruyuki
Wada Masaru
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