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  • 1
    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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  • 2
    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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  • 3
    Electronic Resource
    Electronic Resource
    Besonderheiten des Pyrolyseverhaltens von Isoalkylaromaten (1989)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 331 (1989), S. 61-68 
    Details
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Special Features in Pyrolysis Behaviour of IsoalkylaromaticsThe pyrolysis of cumene, sec. butyl- and tert. butylbenzene proceeds in a laboratory scale quartz vessel in the temperature range 600-750°C. Conversion occurs mainly via a radical-chain mechanism in the side chain in proportions, determined by the dissociation energies of the C—C- and C—H-bonds. Dealkylation was observed in greater amounts than for n-alkylbenzenes. It is interpreted by H-atom addition to the aromatic nucleus, followed by β-scission to benzene and isoalkenes. It was be shown, that H-atoms are formed by unusual reactions such as neophyl rearrangement and homolytic rupture of C—C-bonds in the side chain.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prac.19893310110
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  • 4
    Electronic Resource
    Electronic Resource
    Studies on the Thermal Conversion of Long-chain Alkynes at high temperatures in the gas phaseHerrn Professor Dr. Manfred Mühlstädt zum 60. Geburtstag gewidmet (1989)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 331 (1989), S. 273-284 
    Details
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: In the gas phase pyrolysis of long-chain alkynes C5 to C9 at 773 to 873 K, a remarkable portion of molecular reaction (retro-ene analogous decompositions as well as cycloisomerizations of the parent alkynes to cyclopentenes alkylated in 3-position) takes place besides the thermal conversion of the starting compounds via radical chain processes. The different products were separated by GC and the main products identified by means of different methods. The mechanisms of formation of the major products are discussed.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prac.19893310214
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  • 5
    Electronic Resource
    Electronic Resource
    Zur thermischen Cyclisierung und Aromatisierung von Hex-1-en-5-inHerrn. Prof. Dr. Gerhard Zimmermann zum 60. Geburtstag gewidmet (1990)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 332 (1990), S. 699-709 
    Details
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: On the Thermal Isomerization and Aromatization of Hex-1-ene-5-yneThe gas phase conversion of hex-1-ene-5-yne induced by conventional hot-wall pyrolysis, very low pressure pyrolysis (VLPP-MS technique) and continuous-wave CO2 laser-photosensitized (SF6) pyrolysis was studied at 350-1100°C.The pyrolysis experiments were performed in quartz reactors and the reaction products analyzed by capillary gas chromatography, mass and n.m.r. spectroscopy. The pattern of conversion suggested for all the processes involved a sequence of isomerizations (→hexa-1,2,5-triene→methylcyclopentenes), aromatization (into benzene via pentafulvene) and C—C bond rupture (into propargyl and allyl radicals).The formation of benzene is explained by reaction network with methylenecyclopentenes and methylcyclopentadienes as key intermediates.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prac.19903320519
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  • 6
    Electronic Resource
    Electronic Resource
    Thermal Decomposition of Phenyl Alkyl EthersDedicated to Prof. Dr. Manfred Schulz on the occasion of his 60th birthday (1989)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 331 (1989), S. 923-930 
    Details
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Reaction products and intermediates of the thermal conversions (temperature range: 600 to 1200°C, total pressure about 120 mPa) of phenyl methyl ether (1), phenyl ethyl ether (2), and m-cresyl methyl ether (3) were determined in a pyrolysis apparatur set combined with mass spectral „real time“ analysis. In all cases, the predominant initial process was PhO-R bond homolysis. Phenoxy type radicals thus generated decompose unimolecularly to cyclopentadienyl type radicals and carbon monoxide. In runs with 1 and 2 cyclopentadienyl dimers (C10H10) were formed and, in addition, at temperatures 〉1000°C, naphthalene (C10H8). Under similar conditions the m-methylphenoxy radical (from 3) suffers CO elimination providing the methylcyclopentadienyl radical which chiefly gives benzene instead of the dimers or the products derived from it. Under the applied conditions only bimolecular stabilization of the unsubstituted cyclopentadienyl radical proved possible, whereas the methyl substituted radical has a chance for unimolecular stabilization, too, as a result of which fulvene is formed through the loss of hydrogen. Fulvene is a direct benzene precursor.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prac.19893310606
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  • 7
    Electronic Resource
    Electronic Resource
    Zur Gasphasenpyrolyse von α, ω-Phenylalkenen - Gesetzmäßigkeiten und BesonderheitenHerrn Professor Dr. Siegfried Nowak zum 60. Geburtstag gewidmet (1989)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 331 (1989), S. 977-988 
    Details
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: On the Gas Phase Pyrolysis of α, ω-Phenylalkenes  -  Regularities and Special FeaturesThe thermal conversion of the α, ω-phenyl alkenes 1 to 4 was studied in the presence of a molar excess of Ar or steam at 500 to 875°C in a labscale tubular reactor. Detailed GC analyses did not establish significant evidences for such molecular rearrangements like, e.g., Di-π-methane rearrangement of 2, Ene and Carbo-Claisen reaction of 3. The decomposition obviously occurs via radical chain processes in the main. Besides them, however, radical cyclizations, Neophyl rearrangements and Retro-Ene reactions are parts of the complex reaction.
    Additional Material: 4 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prac.19893310612
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  • 8
    Electronic Resource
    Electronic Resource
    MINDO/3- und MMP2-Berechnungen zur Energetik isomerer Kohlenwasserstoffe der Formel C7H8Herrn Prof. Dr. G. Zimmermann zum 60. Geburtstag gewidmet (1990)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 332 (1990), S. 519-524 
    Details
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: MINDO/3 and MMP2 Calculations on the Energetics for Hydrocarbon Isomers of the Formula C7H8MINDO/3 and MMP2 calculations are reported for 10 closed shell and 3 open shell C7H8 hydrocarbons to study their stability relative to toluene. The thermodynamics of selected equilibrium gas phase reactions is discussed using the calculated heats of formation for these isomeric hydrocarbons. In agreement with experimental results toluene is the most stable isomer. The spirocompound homofulvene reacts under C—C bond scission and formation of the resonance stabilized cyclopentadienyl radical.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prac.19903320415
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  • 9
    Electronic Resource
    Electronic Resource
    Ethylidencyclohexan - Vorstufe für Allyl- und 1,2-Dimethyl-allylradikale in der GasphaseHerrn Prof. Dr. G. Zimmermann zum 60. Geburtstag gewidmet (1990)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 332 (1990), S. 525-532 
    Details
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Ethylidenecyclohexane - Precursor of Allyl and 1,2-Dimethylallyl Radicals in the Gas PhaseA systematic study of the thermolysis of ethylidenecyclohexane (1) and 1-vinylcyclohexene (3) was made under VLPP-MS-conditions. The major fate of 1 is isomerization to 5-methyl-hepta-1,5-diene (2) which may then decompose to allyl (7) and 1,2-dimethylallyl radical (6). The latter is highly unstable and therefore 6 is degraded to isoprene. Minor processes in thermolysis of 1 include further hydrogen elimination to 3 and double bond isomerization to 1-ethylcyclohexene (4). Both cyclohexene derivates undergo most notably RDA-fragmentation.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prac.19903320417
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  • 10
    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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