METHOD OF PRODUCING 4,4'-(m-PHENYLENEDIOXY)DIPHTHALONITRILE Russian patent published in 2012 - IPC C07C253/30 C07C255/51 C07C255/54 

FIELD: chemistry.

SUBSTANCE: invention relates to chemistry, specifically to an improved method of producing 4,4'-(m-phenylene-dioxy)diphthalonitrile (tetranitrile P) of formula I, which can be used as a monomer in synthesis of polyhexazocylanes and polyphthalocyanines, as well as a semi-product in synthesis of polyether imides. The method involves, for example, reaction of 4-nitrophthalonitrile and resorcinol in the medium of an aprotic dipolar solvent in the presence of a base at 80-90°C in 1 hour. The starting compounds - 4-nitrophthalonitrile and resorcinol - are dissolved in N,N-dimethylacetamide and a solution of sesquihydrate potassium carbonate K₂CO₃·1.5H₂O in water is added to the obtained solution. The residue of the end tetranitrile P I separated from the reaction mass is then washed on a filter with an aliphatic alcohol selected from a group comprising methanol or ethanol or 2-propanol.

EFFECT: method enables to obtain tetranitrile P of higher purity with high output.

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