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  • 1
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Advanced Materials 4 (1992), S. 234-238 
    ISSN: 0935-9648
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Chichester : Wiley-Blackwell
    Journal of Physical Organic Chemistry 11 (1998), S. 670-677 
    ISSN: 0894-3230
    Keywords: abnormal Reimer-Tiemann reaction ; theoretical study ; Chemistry ; Theoretical, Physical and Computational Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The molecular mechanism for the pyrrole ring expansion to yield 3-chloropyridine, as a model of the abnormal Reimer-Tiemann rearrangement, was characterized theoretically in vacuo by means of the HF/6-31G* computational method. The electron correlation was estimated at the MP2/6-31G* level and by calculations based on density functional theory, B3LYP/6- 31G* and B3LYP/6- 31+G*. Solvent effects of the diethyl ether and ethanol media were analyzed by using a polarizable continuum model. The stationary points were characterized with analytical gradient techniques in the gas phase and insolvents. The topology of the potential energy surfaces calculated at the MP2/6-31G* and B3LYP/6-31G* levels shows that the molecular mechanism corresponds to an inverted energy profile along one intermediate, associated with the addition of dichlorocarbene at the β-position of the pyrrole anion, and only one transition structure related to the ring expansion associated with the breaking and forming of Cα - Cβ and C - Cα bonds, respectively, and the Cl- leaving process. © 1998 John Wiley & Sons, Ltd.
    Additional Material: 3 Ill.
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  • 3
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 98 (1965), S. 3087-3091 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Ein aus Anthemis-Arten isoliertes Benzolderivat wird in seiner Struktur durch Synthese aufgeklärt. Überraschenderweise wird dieser Thioäther in der Pflanze aus dem weitverbreiteten Dehydromatricariaester gebildet.
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  • 4
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Hydrogenation of Crotonaldehyde and Acetaldole with Modified Pd Carrier Catalysts. I. On the Influence of a Titanium Modification to Pd/Al2O3 CatalystsThe modification of Pd/Al2O3 catalysts with titanium was studied in the hydrogenation of crotonaldehyde and acetaldole. In the result of the titanium modification the hydrogenation activity is increased and the formation of carbon monoxide is decreased. An electronic and geometric ensemble effect should be the reason for the palladium titanium interaction. The mechanism of the acetaldole conversion to butyraldehyde at 160°C is mainly determined by hydrogenolysis in one step and at 200°C by two steps consisting in dehydratization and hydrogenation.
    Additional Material: 7 Ill.
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  • 5
    Electronic Resource
    Electronic Resource
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 316 (1974), S. 47-53 
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Die durch Autoxydation von Alkylhydrazonen gebildeten α-Alkylazo-alkylhydroperoxide 9 lassen sich mit Triphenylphosphin in guten Ausbeuten zu den trans-α-Hydroxy-dialkyl-diazenen (α-Azoalkoholen) 10 reduzieren. Das Reduktionsverfahren erlaubt auch die Gewinnung der von Ketonen abgeleiteten α-Azoalkohole, die bisher nicht zugänglich waren. Die Darstellung einer Reihe von trans-α-Hydroxy-dialkyl-diazenen 10a-j und von α-Azo-alkylhydroperoxiden 9a-h wird beschrieben.
    Additional Material: 2 Tab.
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  • 6
    Electronic Resource
    Electronic Resource
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 332 (1990), S. 1073-1080 
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Hydrogenation of Crotonaldehyde and Acetaldol with Modified Pd-Supported Catalysts. II. On the Influence of a Chromium Modification of Pd/Al2O3 CatalystsThe catalytic properties in hydrogenation reactions on chromium containing Pd/Al2O3 catalysts are influenced by an “esemble effect.” The specific activity in the hydrogenation of crotonaldehyde to n-butyraldehyde is independent of the chromium content in the Pd/Al2O3 catalysts. But the specific activity for the hydrogenolysis of ethane is decresed with the chromium content of the catalysts. On the other hand, was observed that the specific activity of the conversion of acetaldol to n-butyraldehyde rises with increasing chromium content. This specific activity is higher than the specific hydrogenation activity.This fact can be considered as an argument for an asynchron hydrogenolysis of the hydroxyl group in the formation of n-butyraldehyde from acetaldol on Pd—Cr/Al2O3 catalysts.
    Additional Material: 6 Ill.
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  • 7
    Electronic Resource
    Electronic Resource
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 332 (1990), S. 710-718 
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Hydrogenation of Crotonaldehyde, Butyraldehyde and Acetaldole with Modified Ni Carrier Catalysts. I. On the Influence of a Copper Modification of Ni/Kaolin CatalystsThe hydrogenation of crotonaldehyde, butyraldehyde and acetaldol in the presence of Ni-Cu catalysts is a single-centre reaction, whereas the decarbonylation of crotonaldehyde is a multi-centre reaction. The ratio between the specific activities of the hydrogenation of the C=C double bond and the carbonyl group is two. In the conversion of acetaldol the hydrogenolysis to butyraldehyde can be neglected in comparison with the hydrogenation to butan-1,3-diol.
    Additional Material: 6 Ill.
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