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  • 1
    Electronic Resource
    Electronic Resource
    Zur Pyrolyse von Cycloalkenoaromaten (1981)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 323 (1981), S. 607-615 
    Details
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: On the Pyrolysis of CycloalkenoaromaticsThe products of pyrolysis of tetraline (1), indane (2), 2-methylindane (3), and tetrahydroacenaphthene (4) in mixtures of n-paraffins were analyzed by gas chromatography. Results show that by temperatures between 700° and 800°C and residence times of about 0.2 s more than 80% of the reaction products are aromatics. The main pathway of the decomposition of 1, 2, and 4 is the dehydrogenation in direction to the corresponding complete aromatic systems or indene respectively. In the case of 3 we found less than 10% of 2-methylindene but more than 40% of skeleton isomeres. The formation of skeleton isomeres can be explained by the concept of radical rearrangements.
    Additional Material: 2 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prac.19813230412
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  • 2
    Electronic Resource
    Electronic Resource
    Zur Pyrolyse von 1-14C-Pent-1-en (1983)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 325 (1983), S. 283-292 
    Details
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: On the Pyrolysis of 1-14C-Pent-1-eneIn the thermal decomposition of 1-14C-pent-1-ene at 550 to 650°C a mixture of saturated and olefinic hydrocarbons ≤ C6 is formed. The reaction products were analyzed by gaschromatography, the distribution of radioactivity in the main products by radio gaschromatography.The results are discussed on the basis of a conventional radical reaction scheme including 1.4- and 1.5-H-shifts in intermediate alkyl and alkenyl radicals. The distribution of pyrolysis products and of their radioactivity allows a semiquantitative description of the complex decomposition of n-pent-1-en.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prac.19833250215
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  • 3
    Electronic Resource
    Electronic Resource
    Über die Pyrolyse von Pent-1-en-3,3-d2 (1983)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 325 (1983), S. 375-381 
    Details
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: On the Pyrolysis of Pent-1-ene-3,3-d2The distribution of deuterium in the main products of the thermal decomposition of pent-1-ene-3,3-d2 at 550 to 650°C was studied and interpreted. The results include conclusions on kinetic isotope effects, on relative reactivities of different C—H-bonds, and on the importance of nonterminal radical addition. It is shown that butadiene-d2 detected in the isotopically labeled butadiene fraction is a reliable target molecule for the homoallylic rearrangement of the pent-1-ene-4-yl-3,3-d2 radical.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prac.19833250305
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  • 4
    Electronic Resource
    Electronic Resource
    Quantenchemische Berechnungen an Radikalen vom Allyltyp: Methylsubstituierte Allylradikale (1986)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 328 (1986), S. 886-892 
    Details
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Quantum-Chemical Calculations on Allyl-Type Radicals: Methyl-Substituted Allyl RadicalsMethyl-substituted allyl radicals were calculated by MINDO/3. Based on heats of formation of planar and perpendicular radicals phenomena like thermodynamic stability and regio as well as stereoselectivity are discussed. It is shown that the semiempirical method has artefacts. But in most of the cases MINDO/3 gives a qualitatively correct description of the chemical behaviour of allyl radicals with respect to experimental details.
    Additional Material: 3 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prac.19863280530
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  • 5
    Electronic Resource
    Electronic Resource
    Reaktionen von Cyclanyl-Radikalen in der Gasphase. I. Cyclohexyl-Radikale aus AzocyclohexanHerrn Prof. Dr. J. Ulbricht zum 60. Geburtstag gewidmet (1984)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 326 (1984), S. 561-571 
    Details
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Reactions of Cyclanyl Radicals in the Gas Phase. I. Cyclohexyl Radicals from AzocyclohexaneBy theorem cyclothexyl radicals can react to yield the three isomeric C6H11-radicals: 5-hexenyl-, resonance-stabilized propyl allyl-, and cyclopentylmethyl radical.This is not sufficient a basis to explain the amount of propylene by the conversion of cyclohexenyl radicals at high temperatures. For this reason we have studied the decomposition behaviour and all other types of reactions of cyclohexyl radicals from azocyclohexane as radical source in a flow system between 400 and 480°C and in part more.The most important result is the evidence of the 3-methylcyclopentyl radical as an essential reaction intermediate.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prac.19843260406
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  • 6
    Electronic Resource
    Electronic Resource
    Experimentelle und theoretische Untersuchungen an Kohlenwasserstoffen der Formel C5H6: Pyrolyse von Cyclopenta-1,3-dienHerrn Prof. Dr. Dr. H. G. O. Becker zum 65. Geburtstag gewidmet. (1987)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 329 (1987), S. 511-519 
    Details
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Experimental and Theoretical Investigations on Hydrocarbons of the Formula C5H6: Pyrolysis of 1,3-CyclopentadieneThe details of high temperature chemistry of the conversion of 1,3-cyclopentadiene (CPD) are unknown. Therefore the pyrolysis of CPD was studied under various reaction conditions in labscale dimension. The attempt to interpret the composition of the reaction products only on the basis of convenient axiomes does not seem satisfactory. For that reason heats of formation and relative stabilities for 25 closed and open shell hydrocarbons of the formula C5H6 were calculated using the MINDO/3 procedure. These enthalpy values were used to estimate heats of reactions for selected start steps of the pyrolysis of CPD. The molecular-assisted hydrogen transfer under formation of cyclopentadienyl and cyclopentenyl radicals ought to be one of the most important reaction steps.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prac.19873290318
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  • 7
    Electronic Resource
    Electronic Resource
    Eine einstufige Synthese von Azomethan (1985)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 327 (1985), S. 868-870 
    Details
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: A One-pot Synthesis of Azomethane
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prac.19853270521
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  • 8
    Electronic Resource
    Electronic Resource
    Über die Pyrolyse von Pent-1-en-4,4,5,5,5-d5 (1983)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 325 (1983), S. 699-707 
    Details
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: On the Pyrolysis of Pent-1-ene-4,4,5,5,5-d5The distribution of deuterium in the main products of thermal decomposition of pent-1-ene-4,4,5,5,5-d5 at 550 to 650°C was studied and interpreted. The results include conclusions on kinetic isotope effects, on relative reactivities of different C-H-bonds, on the proportion of terminal and nonterminal addition of methyl radicals, and on the importance of a radical isomerisation reaction. It was shown that the molecular decomposition (Retro-En-Reaction) cannot successfully compete with the radical way in the temperature range above 600°C
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prac.19833250504
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  • 9
    Electronic Resource
    Electronic Resource
    Quantenchemische Berechnungen an Radikalen vom Allyltyp: Cycloalkenyl- und Cycloalk-1-enylmethylradikale (1984)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 326 (1984), S. 139-144 
    Details
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Quantum-Chemical Calculations on Allyl-Type Radicals: Cycloalkenyl- and Cycloalk-1-enylmethyl RadicalsThe ability of the MINDO/3-HE-method for predicting various molecular properties was tested for cycloalkenyl- (1 to 4), cycloalk-1-enylmethyl-(5 to 8), and for the resonance-stabilized cyclic radicals (9 to 12). Close by it was established that the calculated heats of formation are largely correct. The electronic distribution in the allylic part of 1 to 12 is evidently too levelled.Based on the defination of allyl resonance energy (ARE - SZWARC (1948)) a mean value for the ARE of 1 to 8 is derived to 55 ± 12 kJ · mol-1.
    Additional Material: 3 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prac.19843260119
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  • 10
    Electronic Resource
    Electronic Resource
    Reaktionen von Cyclanyl-Radikalen in der Gasphase. II. Cyclohexyl-Radikale aus Azomethan-Cyclohexan-GemischenHerrn Prof. Dr. J. Ulbricht zum 60. Geburtstag gewidmet (1984)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 326 (1984), S. 853-862 
    Details
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Reactions of Cyclanyl Radicals in the Gas Phase. II. Cyclohexyl Radicals from Mixtures of Azomethane and CyclohexaneCyclohexane-azomethane mixtures in argon as diluent were converted by temperatures between 400 and 480°C in a stirred flow system. All products were analytically determined in a comprehensive way. In this way not only isomeric C6H11-radicals, which were already known from former investigations, but also hitherto unknown C6H11-radicals, especially the 3-methylcyclopentyl radical, could be detected as a recombination product with methyl radicals or as the corresponding olefinic compounds. From the results the stationary concentrations of important radical species were estimated and mechanistic consequences discussed.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prac.19843260603
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