The structure of polyphenylenes obtained by polycyclocondensation of ketone acetals of aromatic acetyl compounds was investigated by IR spectroscopy. It could be shown that in the course of polycyclocondensation 1,3,5-substituted benzene rings are formed, which are characterized by the specific absorption bands at 880 and 1400cm-I. The spectral data permit the evaluation of defective (non-aromatic) fragments in the polymer chains.
ZUSAMMENFASSUNG:Die Struktur der durch Polycyclokondensation von Ketonacetalen aromatischer Acetylverbindungen dargestellten Polyphenylene wurde IR-spektroskopisch untersucht. Es konnte gezeigt werden, daR sich bei der Polycyclokondensation 1,3,5-substituierte Benzolringe bilden, die durch spezifische Absorptionsbanden bei 880 und 1 400 cm-charakterisiert werden. Die IR-Daten erlauben, die Anwesenheit von defektiven (d. h. nichtaromatischen) Fragmenten in den Polymerketten abzuschatzen.
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