Process for the preparation of crystalline O-isopropylisourea hy

Details Process for the preparation of crystalline O-isopropylisourea hy Process for the preparation of crystalline O-isopropylisourea hy

1996-06-19

1998-01-06

Ambrose, Michael G.

Organic compounds -- part of the class 532-570 series

Organic compounds

Imidate esters

C07C27570

Patent

active

057056668

ABSTRACT:
Disclosed is a process for the preparation of crystalline O-isopropylisourea hydrochloride, wherein cyanamide, chloroformamidinium chloride and isopropanol are reacted, an aprotic solvent preferably selected from the group consisting of ketones, ethers, esters and acetals, is added to the reaction mixture before, during and/or after the reaction and, optionally after cooling the reaction solution, the crystalline reaction product is separated off. O-isopropylisourea hydrochloride is obtained in a very pure and coarse crystalline form by the process of the invention.

REFERENCES:
patent: 2039514 (1936-05-01), Battegay
patent: 3551489 (1970-12-01), Schaefer
patent: 3670022 (1972-06-01), Schaefer
patent: 3931316 (1976-01-01), Weiss
Canadian Journal of Research, 1 (1929), Studies in Iso-Ureas And Iso-Ureides, by S. Basterfield and E.C. Powell, pp. 261-271.
Database CAPLUS on STN, Columbus: Chemical Abstracts Service, Acc. No. 1971:124906, DE 1948370 (Prietzel), abstract, Apr. 1971.

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