Polymere bis(oxazolo)pyrene. Synthesen und charakterisierung von poly(2,8‐oxazolo[2′,3′:7,8]pyreno[4,5‐d]‐oxazoldiyl‐1,4‐phenylen)en und einigen dazugehörigen modellverbindungen

Abstract

Polymere Bis(oxazo1o)pyrene Synthesen und Charakterisierung von Poly(2,&oxazolo[2',3 : 7,8]pyreno[4,5-d]oxazoldiyl-1,4-phenylen)en und einigen dazugehorigen Modellverbindungen Gregor Wehr (Eingangsdatum: 21. Mai 1975) ZUSAMMENFASSUNG: Durch Reaktion von 4,5,9,10-Pyrendichinon rnit verschiedenen aromatischen Dialdehyden wurden neuartige Polyoxazole synthetisiert. Ihre Struktur wurde durch Vergleich ihrer IR-Spektren rnit denjenigen von entsprechend aufgebauten niedermolekularen Modellsubstanzen bestatigt. Die Thermostabilitat der Polymeren wurde untersucht. SUMMARY:Some new polyoxazoles were synthesized by reaction of 4,5,9,10-pyrene diquinone with different aromatic dialdehydes. Their structure was confirmed by comparing their IR-spectra with those of some corresponding low molecular model compounds. The thermal stability of the polymers was investigated.

Ruthenium(III) Chloride Catalyzed Oxidation of Pyrene and 2,7-Disubstitued Pyrenes: An Efficient, One-Step Synthesis of Pyrene-4,5-diones and Pyrene-4,5,9,10-tetraones

“…One of the oxidation products, pyrene-4,5-dione ( 2a ), is also important because it serves as an intermediate in the preparation of other fused-ring molecules, which are of interest from both a theoretical and a practical point of view . Further oxidation of pyrene-4,5-dione gives pyrene-4,5,9,10-tetraone ( 3a ), which has been used in metal complex formation and as a monomer in step growth polymerizations. 2a, Previous attempts to prepare 2 and 3 directly from pyrene have been largely unsuccessful since sites other than C(4) and C(5) more readily undergo oxidation. 2c, Dione 2a has been prepared in low yield by the oxidation of pyrene with the highly toxic osmium tetroxide 2c. Compound 2a , 3a , the 2,7-disubstituted pyrenedione 2b , and the pyrene tetraone 3b have been prepared by multistep synthetic routes. 3f,

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