Patent ID: 7879999

Claim:
A method for synthesizing derivatives of exocyclic cycloalkyl-hydrazines and heterocycloalkyl-hydrazines of the formula (I): in which, R1 and R2 are identical or different and represent a hydrogen atom or a C 1 -C 6 alkyl radical, or R1 and R2 together form a C 3 -C 8 cycloalkyl radical, and n equals 1 to 3, said method comprising the following successive steps: (a) synthesizing the derivative of exocyclic cycloalkyl-hydrazine or heterocycloalkyl-hydrazine in a suitable reactor by causing a monochloramine to react with a heterocyclic amine in an alkaline medium at a temperature of between 30 and 60° C.; then (b) demixing the solution obtained at step (a) into an organic phase and an aqueous phase through the addition of anhydrous sodium hydroxide under cooling so that the temperature does not exceed the boiling point of the compounds.