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US 4,304,935 AGranted
Production of 1-phenyl-3-cyanoureas
AssigneeRexolin Chemicals AB
InventorsJohn V. Brammer-Petersen, Christer L. Hakanson, Per T. Lindgren
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Abstract
Disclosed herein is a method for producing 1-phenyl-3-cyanoureas with the general formula: ##STR1## by reacting the corresponding benzamide with an alkali metal or alkaline earth metal hypohalite followed by reaction with cyanamide.
Claims16
A process for preparing cyanourea compounds of formula I ##STR4## wherein R.sub.1, R.sub.2 and R.sub.3 are independently selected from the group consisting of hydrogen, lower alkyl of 1 to 4 carbon atoms inclusive and lower alkoxy of 1 to 4 carbon atoms inclusive;
- which comprises the consecutive steps of:
- (a) treating a benzamide of the formula II ##STR5## wherein R.sub.1, R.sub.2 and R.sub.3 are as defined above with hypohalite ions;
- and
- (b) admixing the reaction mixture produced in (a) with a sufficient amount of cyanamide in the presence of a base, to provide a mole ratio of cyanamide to benzamide of from 1 to 5.
1 more element
Dependencies are inferred from the claim text.