Process for preparing nitrogen compounds

Details Process for preparing nitrogen compounds Process for preparing nitrogen compounds

C - Chemistry, Metallurgy

07

D

260/306.1, 260/5

C07D 209/48 (2006.01) C07C 63/68 (2006.01)

Patent

CA 1060043

PROCESS FOR PREPARING NITROGEN COMPOUNDS ABSTRACT OF THE DISCLOSURE (Cyclo)alkylenediammonium-bis-tetrahalophthalates corre- sponding to the formula: Image wherein X is halogen and R is an alkylene or cycloalkylene group con- taining 2-15 carbon atoms are prepared by hydrolyzing a tetrahalo- phthalic anhydride to the corresponding tetrahalophthalic acid and then reacting the tetrahalophthalic acid in the resultant reaction mix- ture with a diaminoalkane or diaminocycloalkane containing 2-15 carbon atoms in a molar ratio of about two molar proportions of the acid per molar proportion of the diamine. The (cyclo)alkylenediammonium-bis-tetrahalophthalates of the invention are useful as flame retardants for normally flammable organic polymers and also have utility as intermediates for the preparation of N,N'-(cyclo)alkylene-bis-tetrahalophthalimides, which are also useful as flame retardants. The imides are prepared simply by heating the salts until an acid number of substantially 0 is obtained.

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