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  • 1
    Electronic Resource
    Electronic Resource
    Hoboken, NJ : Wiley-Blackwell
    AIChE Journal 22 (1976), S. 102-110 
    ISSN: 0001-1541
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: The physical and chemical characteristics that influence the conversion of fuel nitrogen to nitrogen oxides during coal char combustion were theoretically examined by using a simplified model in which nitric oxide is an intermediate product between fuel nitrogen and N2.It was found that diffusion-reaction interactions were important in determining the selectivity of the char particle toward nitric oxide production. At low temperature fluidized bed combustion conditions, pore size is important, and low conversion of fuel nitrogen to nitric oxide is favored by long narrow pores. Under high temperature, pulverized coal combustion conditions, the model provided insight into mechanisms of nitric oxide formation and predicted the observed weak temperature dependence of fuel nitrogen conversion, as well as a significant effect of particle size.
    Additional Material: 8 Ill.
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  • 2
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 110 (1977), S. 2744-2750 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Synthesis and Properties of 1,3,2-Diazaborolium Salts and Δ4-1,3,2-DiazaborolinesThe 1,3,2-diazaborolium salts 2 are formed in good yields from α,β-diimines 1 and haloboranes RBX2. 2a-g are investigated by IR, 1H-, 11B-, and partially 13C NMR spectroscopy. Though the reduction of the diazaborolium salts to the Δ4-1,3,2-diazaborolines 4 by sodium amalgam is successful, most of the diazaborolines can be identified only spectroscopically as they decompose quickly.
    Notes: Die 1,3,2-Diazaborolium-Salze 2 bilden sich in guten Ausbeuten aus α,β-Diiminen 1 und Halogenboranen RBX2. 2a-g wurden IR-, 1H-, 11B- und teilweise auch 13C-NMR-spektroskopisch untersucht. Obwohl die Reduktion der Diazaborolium-Salze zu den Δ4-1,3,2-Diazaborolinen 4 mittels Natriumamalgam in allen Fällen gelingt, können die meisten Diazaboroline nur spektroskopisch identifiziert werden, da sie sich schnell zersetzen.
    Additional Material: 4 Tab.
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  • 3
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 110 (1977), S. 3714-3718 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Reactions Involving Hydrogen-Transfer, I. 1,4-Di(9-fluorenylidene)-2,3-diphenylbutane1-(2,2′-Biphenylylene)-3-phenyl-1-propene (6) was prepared according to equation (1) 6, which is CH-active, reacts at room temperature with 9,9-dipiperidinofluorene (1) or with tetrachloro-o-benzoquinone to yield the title compound 9.
    Notes: 1-(2,2′-Biphenylylen)-3-phenyl-1-propen (6) wurde nach Gleichung (1) hergestellt. Als CH-aktive Verbindung liefert 6 mit 9,9-Dipiperidinofluoren (1) oder mit Tetrachlor-o-benzochinon bei Raumtemperatur die Titelverbindung 9.
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  • 4
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 108 (1975), S. 322-327 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: 1,2,3-Tricarbonylverbindungen, X. The Action of Diaryidiazomethanes on Cyclic 1,2-Di- and 1,2,3,-Tricarbonyl CompoundsThe action of asymmetrically substituted diaryldizaomethanes on o-quinones and cyclic 1,2,3-tricarbonyl compounds yields 1,3-dioxoles of type B (schema (2)). Attention is drawn to the problem of valency isomerism and to the difference in mass spectra of α-ketoepoxides of type A and of 1,3-dioxoles of type B.
    Notes: Bei der Einwirkung unsymmetrisch substituierter Diaryldiazomethane auf o-Chinone und cyclische 1,2,3-Tricarbonylverbindungen entstehen nach Schema (2) 1,3-Dioxole des Typs B. Die Frage der Valenzisomerisierung von α-Ketoepoxiden des Typs A und 1,3-Dioxolen des Typs B sowie die Fragmentierungsunterschiede beider Verbindungstypen im Massenspektrometer werden diskutiert.
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  • 5
    ISSN: 0323-7648
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Additional Material: 2 Ill.
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  • 6
    ISSN: 0323-7648
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: The degradation of polytetrafluoroethylene by accelerated electrons in oxygen has been investigated. The radicals formed by radiation result in a mixture of perfluoroalkane acid fluorides and perfluoroalkanes, having different length of the carbon chain, besides 40 to 60% COF2 and small amounts of perfluoroalkenes. By hydrolysis about 15 to 18% of the reaction products are converted to perfluoroalkane acids, two thirds of them ranging between C6 and C14. On reducing the amount of O2 the formation of COF2 decreases with increasing yield of perfluoroalkenes.
    Notes: Der Abbau von Polytetrafluorethylen durch Einwirkung von beschleunigten Elektronen in Sauerstoff wurde untersucht. Aus den strahlenchemisch zunächst gebildeten Radikalen entsteht ein Gemisch von Perfluoralkansäurefluoriden und Perfluoralkanen unterschiedlicher Kohlenstoffkettenlänge neben 40 bis 60% COF2 und wenig Perfluoralkenen. Nach Hydrolyse sind etwa 15 bis 18% der Reaktionsprodukte als Perfluoralkansäuren gewinnbar; zwei Drittel davon gehören dem Kettenlängenbereich C6 bis C14 an. Mit Verringerung des O2-Angebots sinkt die COF2-Bildung bei steigender Ausbeute an Perfluoralkenen.
    Additional Material: 3 Ill.
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  • 7
    Electronic Resource
    Electronic Resource
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 8 (1976), S. 246-251 
    ISSN: 0030-4921
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: 1H NMR spectra of several aliphatic and phenyl substituted alkenediynes have been obtained. Chemical shifts and coupling constants of these compounds are discussed in conjunction with some compounds described in the literature. Chemical shifts of the protons from isomeric alkenediynes R—C≡C—C≡C—CH=CH2, R—CH=CH—C≡C—C≡CH and R—CH=CH—C≡C—C≡C—CH3 (R = H, alkyl, C6H5, C6H4OCH3-p) are well correlated with cis/trans-isomerism and electronic effects of substituents at the C=C bond. The coupling constants were found to be only slightly dependent on the substitution at the double bond. We could resolve couplings over a maximum of eight bonds in the alkenediyne system.
    Notes: Die 1H-NMR-Spektren einer Reihe aliphatisch und phenylsubstituierter Alkendiine werden vorgestellt und, unter Berücksichtigung einiger literaturbekannter Verbindungen, chemische Verschiebungen und Kopplungskonstanten diskutiert.Die chemischen Verschiebungen der Protonen der untersuchten isomeren Alkendiine R—C≡C—C≡C—CH=CH2, R—CH=CH—C≡C—C≡CH und R—CH=CH—C≡C—C≡C—CH3 (R = H, Alkyl, C6H5, C6H4OCH3-p,) lassen sich hinsichtlich cis/trans-Isomerie und Substitution an der Doppelbindung befriedigend mit elektronischen Effekten und molekularen Magnetfeldern der Mehrfachbindungen erklären. Die Kopplungs-konstanten erweisen sich als kaum abhängig von der Substitution an der Doppelbindung. Über die Diacetylengruppierung hinweg können Kopplungen über maximal acht Bindungen beobachtet werden.
    Additional Material: 3 Ill.
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  • 8
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Studies on the Solubility of Molybdatophosphates. I. Solubility of Quinolinium MolybdatophosphateThe solubility of quinolinium molybdatophosphate was determined radiochemically under conditions of the gravimetric determination of phosphate in hydrochloric acid as well as in nitric acid media. The residue concentration of phosphate variies in the range of 10-8 to 10-9 mol/I. The dependence of the solubility on the reagent concentration and on the concentration of solution components was investigated and discussed variing the pore width of the filters used for separating the precipitate. The accuracy and the precision of the determination of phosphate was not influenced in practice by the solubility.
    Notes: Die Löslichkeit von Chinoliniummolybdatophosphat wurde unter den Bedingungen der gravimetrischen Phosphatbestimmung sowohl in salz- als auch in salpetersaurer Lösung auf radiochemischem Wege ermittelt. Sie liegt im Konzentrationsbereich von 10-8 bis 10-9 mol/I. Die Abhängigkeit der Löslichkeit von der Konzentration der Reagenzien und der Lösungskomponenten wurde für das Verfahren in salzsaurer Lösung untersucht und diskutiert, wobei gleichzeitig die mittlere Porenweite der zur Abtrennung des Niederschlages verwendeten Filter variiert wurde. Es wird gezeigt, daß sich die Löslichkeit in der Praxis weder auf die Richtigkeit noch auf die Reproduzierbarkeit der Phosphatbestimmung auswirkt.
    Additional Material: 4 Ill.
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  • 9
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Chemie Ingenieur Technik - CIT 50 (1978), S. 617-618 
    ISSN: 0009-286X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Type of Medium: Electronic Resource
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  • 10
    Electronic Resource
    Electronic Resource
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 317 (1975), S. 919-925 
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Durch Kondensation von ω-Nitrocarbonsäureestern 1 - 3 mit aromatischen Aldehyden in Gegenwart von n-Butylamin bzw. Äthylendiamin entstehen ω-arylsubstituierte Nitrovinylcarbonsäureester 5 - 7. Die gleichen Verbindungen können durch Umsetzung von ω-Nitrocarbonsäureestern mit Benzal-n-butylamin dargestellt werden. Die Anwendung von Ammoniumacetat in Eisessig als Katalysator führt dagegen zu 5-Nitro-6-phenyl-piperidonen-(2) 9. Verbindung 9 a wurde mit LiAlH4 zu 2-Phenyl-3-amino-piperidin 10 a reduziert.
    Additional Material: 2 Tab.
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