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1992 (1)
1Author    Hans Bock, Bodo BerknerRequires cookie*
 Title    Gasphasen-Reaktionen, 91 [1 -3 ] Thermische und heterogen-katalysierte N2-Abspaltung aus Azo-Verbindungen R-N=N-R (R = CH3, C3H5, C6H5) Gas Phase Reactions, 91 [1-3] Thermal and Heterogeneously Catalyzed N 2 Elimination of Azo-Compounds R -N = N -R (R = C H 3, C3H 5, C6H5) Ausgangspunkt: Die thermische Zersetzung von Azo-Verbindungen in der Gasphase  
 Abstract    Thermal decom positions o f azo compounds in the gas phase under reduced pressure are fur­ ther investigated using photoelectron spectroscopic gas analysis. Passing diallyl, diphenyl and phenylmethyl derivatives either through a short-pathway pyrolysis (SPP) apparatus or through an external thermal reactor (ETR) results in the follow ing fragmentations; Under nearly unimolecular conditions (SPP, 10~4 mbar pressure), diallyldiazene decom poses above 600 K to N 2 and hexadiene-1,5 with the allyl radical as a detectable intermediate. The PE spec­ tra recorded for diphenyldiazene above 1000 K (ETR, 10-2 mbar pressure) show N 2, benzene, as well as traces o f diphenyl. Phenylmethyldiazene yields above 800 K (SPP) predominantly N 2, toluene, diphenyl and ethane with the methyl radical as the only detectable intermediate. Insertion o f quartz w ool into the pyrolysis tube (ETR) lowers the fragmentation temperatures, and in addition, above 850 K, HC N and aniline are PE spectroscopically identified. Surpris­ ingly, this second reaction channel can be heterogeneously catalyzed; phenylmethyldiazene de­ com poses under 10"2 mbar pressure at a [N i/SiO J catalyst surface selectively to H C N and ani­ line. 
  Reference    Z. Naturforsch. 47b, 1551—1560 (1992); eingegangen am 12. März 1992 
  Published    1992 
  Keywords    A zo Com pounds, Photoelectron Spectra, Gas Phase Thermolysis, H eterogeneous Catalysis 
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 TEI-XML for    default:Reihe_B/47/ZNB-1992-47b-1551.pdf 
 Identifier    ZNB-1992-47b-1551 
 Volume    47