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1992 (1)
1976 (1)
1Author    Peter Paetzold, Peter Böhm, Anette Richter, Ernst SchollRequires cookie*
 Title    Synthese, Basenaddition und Fragmentierung der 1.3.2-Dioxaborolan-4-one Synthesis, Addition of Bases, and Fragmentation of l,3,2-Dioxaborolane-4-ones  
 Abstract    2,5,5-Triorgano-l,3,2-dioxaborolane-4-ones RB(-O-CO-CXY-O-) (2-6) can be prepared from a-hydroxycarboxylic acids XYC(OH)-COOH and dihalogenoorganoboranes RBHal2. They are much weaker Lewis acids than the 2-organo-l,3,2-dioxaborolane-4,5-diones RB(-O-CO-CO-O-) (1). The compounds 1 give 1:1 adducts with the bases DINO, MANO, PyO, and PSy, respectively; the crystal structure determination of If • DINO reveals a simple BO-coordination between the components. On electron impact, the chief fragmen-tation path is the elimination of C02 from compounds 1-6. The thermal degradation of 2-6 seems to be rather complicated in the liquid phase but is unique in the gaseous phase forming the compounds (RBO)3, CO, and XYC = 0. 
  Reference    (Z. Naturforsch. 31b, 754—764 [1976]; eingegangen am 5. Dezember 1975/8. März 1976) 
  Published    1976 
  Keywords    Dioxaborolanones, Molecular Structure, Mass Spectra, Crystal Structure, Gas-phase Thermolysis 
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 TEI-XML for    default:Reihe_B/31/ZNB-1976-31b-0754.pdf 
 Identifier    ZNB-1976-31b-0754 
 Volume    31 
2Author    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