PREPARATION OF BIS-HYDRAZINES

摘要

The present invention relates to a process for preparing a bis-hydrazine corresponding to the formula (I): (R) (NH2) NAN (NH2) (R) (I) in which A is a difunctional hydrogen-carbon group , linear, branched, consisting of or containing a ring, saturated or unsaturated, comprising from 2 to 6 carbon atoms, and R is a monofunctional hydrogen carbonaceous group, linear or branched, saturated or unsaturated, comprising from 1 to 4 carbon atoms, carbon. Said process comprises: the gradual addition, for reaction purposes, of a di-halogen compound of formula (III): XAX (III) in which A is as defined above and X is a halogen chosen from chlorine and bromine, on a hydrazine derivative of formula (II): R-NH-NH2 (II) in which R is as defined above, the temperature of the reaction medium, during said addition, being controlled between 0 and 80 ° C; said compound of formula (III) being, in the end, at most added in a molar ratio of said compound of formula (III) to said derivative of formula (II) equal to 0.25; - At the end of said addition, continuation of the reaction, with control of the temperature of the reaction medium between 0 and 80 ° C, advantageously until maximum conversion of said compound of formula (III) added; and - isolation of the bis-hydrazine of formula (I) thus synthesized.