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093ChemInform Abstract Due to the insolubility of the title compound (III) in suitable solvents, its conversion to the corresponding acid chloride is only possible with PCl5/AcCl (see scheme). Reaction of this chloride with conc. ammonia gives the amide (V).

0-and p-Phenylenedioxydiacetic acid (0-, p-PhDDA) undergo in presence of 1,6-hexamethylene(HMD1)-, 2,4-toluylene(TDI)-,4,4'-dibenzyl (DBD1)-and 1,5-naphthylene (ND1)diisocyanates polyaddition reactions. These reactions being accompanied by COz evolution finally give polyamides. These syntheses were carried out based on preliminary studies regarding the reactivity of 0-and p-PhDDA with aromatic isocyanates. When 0-and p-PhDDA acids react with aromatic isocyanates N,N'-disubstituted diamides are formed. Both reaction partners show bands in their IR-spectra characteristic to