Isochem

Centre National De La Recherche Scientifique

University Claude Bernard - Lyon 1

Jacques Berthet

Henri R Delalu

Pierre Le Gars

Cécile Colas-Duriche

Philippe Leurent

Denis Souyri

Cécile Duriche

The invention relates to a method for the synthesis of exocyclic derivatives of cycloalkyl-hydrazines and exocyclic derivatives of heterocycloalkyl-hydrazines The invention is characterised in that the method comprises a step consisting in demixing a solution containing said synthesised derivative, by reacting a heterocyclic amine with monochloramine, in an organic phase and an aqueous phase with the addition of anhydrous sodium hydroxide. According to the invention, the starting amine which has not reacted is collected and reused directly without any additional treatment. The inventive method can also be used to obtain the corresponding exocyclic heterocycloalkyl-hydrazine or cycloalkyl-hydrazinederivative derivative at a low cost compared to that of other known methods.

Method for the synthesis of exocyclic derivatives of cycloalkyl-hydrazines and exocyclic derivatives of heterocycloalkyl-hydrazines

The invention relates to a method for the continuous synthesis of monoalkyl-hydrazines with a functionalized alkyl group. The inventive method is characterized in that it comprises a step consisting in demixing a solution containing the synthesized monoalkyl-hydrazine, by reacting an anhydrous amine with monochloramine, in an organic phase and an aqueous phase with the addition of anhydrous sodium hydroxide. The invention can be used to obtain perfect selectivity in relation to monoalkyl-hydrazine without the presence of the di- and tri-substituted forms thereof. According to the invention, the staffing amine which has not reacted is collected and reused directly without any additional treatment.

Method for the continuous synthesis of monoalkyl-hydrazines with a functionalized alkyl group

The invention relates to a process for the synthesis of monochloramine by reaction of an ammonium chloride solution with a sodium hypochlorite solution. The sodium hypochlorite solution is basified beforehand with an inorganic base and the ratio of the concentration of ammonium chloride in the reaction medium to the concentration of sodium hypochlorite in the reaction medium is between 1 and 1.5. This ratio is preferably equal to 1.1.

Process for the synthesis of monochloramine

The present invention relates to a process for the selective decomposition of hydrazine in a hydrazine/substituted hydrazine/water mixture. A catalyst chosen from the group consisting of nickel supported on silica/alumina, the nickel-nickel oxide mixture supported on silica/alumina and rhodium supported on carbon is introduced into this mixture and then the mixture is heated at a temperature of between 60&#xb0; C. and 120&#xb0; C.

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Lyons, France

Jacques Berthet