Imino diacids

Poly(imino-l,4-phenyleneiminoterephthaloyl) (XIV) (trade names Kevlar, Twaron) is synthesized from the corresponding para-substituted diamine and diacid chloride. Poly (iminocarbonyl-l,4-phenylene) (XV) (also known as Kevlar) is based on p-aminobenzoic acid. 

VIII) may be briefly summarized as follows. Villalstonine is a dimeric, diacidic base, which contains one methoxycarbonyl group, two methyl-imino groups, and an ethylidene group. Its UV spectrum is consistent with the presence of indole and dihydroindole chromophores containing no substituents in the benzene rings. Alkali fusion yields 2-methylindole, indole 2-carboxylic acid, and a /3-carboline derivative selenium dehydrogenation also affords a j8-carboline derivative, so far unidentified. Acid hydrolysis of villalstonine yields pleiocarpamine (XV), one of the alkaloids of Pleiocarpa mutica Benth. 

FIGURE 9.15 Monomerunitof nylon 66. The first 6 of the sufBx indicates the number of carbon atoms in the diamine component (hexamethylene diamine). The second 6 indicates the number of carbon atoms in the diacid component (adipic acid). Nomenclature poly(hexamethylene adip-amide) and lUPAC poly[imino(l,6-dioxohexamethylene)iminohexamethylene]. 

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