Process for the preparation of hydrazidines

Details Process for the preparation of hydrazidines Process for the preparation of hydrazidines

A - Human Necessities

01

N

260/544.3

A01N 43/64 (2006.01)

Patent

CA 1189532

Abstract Process for the Preparation of hydrazidines A one-step process for the preparation of hydrazidines of the general formula Image (I), in which R represents an optionally substituted alkyl group, an optionally substituted cycloalkyl group, an optionally sub- stituted aryl group or an optionally substituted aralkyl group, or their acid addition salts, in high yield, comprises reacting appropriate amidines or their acid addition salts with hydrazine hydrate (NH2-NH2 x H2O) in technical solvents at reduced pressure and at temperatures between -80°C and +100°C. The hydrazidines of formula (I) and their salts are valuable intermediates in heterocyclic chemistry, for example for the synthesis of herbicidally active as-triazi- nones.

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