Isophthalic acid reaction with, phosgene

Polyanhydrides of terephthalic acid (10.39), isophthalic acid (10.40), and sebacic acid (10.41), were prepared by reaction with phosgene in toluene in the presence of NEtj [1865]. The polymers all have the general structure 10.42 X = l,4-CgH4, 1,3-CgH or (CHj). ... 

The polyarylesterketones can be produced by means of interaction between bisphenylsulfide, dibenzo rane and bisphenyloxide with monomers of electrophylic nature (phosgene, terephthaloylchloride) or using homopolycondensation of 4-phenoxybenzoylchloride and 4-phenoxy-4-chlorcarbonyl-bisphenyl in the presence of dichloroethane at 25 °C [282-285], Aromatic polyesterketones form after the polycondensation of 4-phenoxybenzoylchloride with chloranhydrides of tere- and isophthalic acids, 4,4 -dicarboxybisphenyloxide in the environment of nitrobenzene, methylchloride and dichloroethane at temperatures from -70 till 40 °C during 16-26 h according Friedel-Crafts reaction. 

Phthaloyl chlorides [isophthaloyl chloride (ICL) and terephthaloyl chlo-ride(TCL)] are made by at least two processes, both involving the chlorination of phthalic acid. In the first (13), xylene is chlorinated by a photochemical reaction to form hexachloroxylene. The hexachloroxylene then reacts with phthalic acid to give the corresponding phthaloyl chloride and by-product HCl. Phthaloyl chloride is purified by double distillation. To produce ICL by this reaction, m-xylene and isophthalic acid are the starting materials. To produce TCL, the process starts with p-xylene and terephthalic acid. Phthaloyl chlorides can also be produced by reacting intermolecular anhydrides of the corresponding acids with phosgene, in the presence of an amide catalyst such as DMF or DMA (14). 

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