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  • 1
    Electronic Resource
    Electronic Resource
    Experimental and analytical study of wall reaction and transport effects in fast reaction systems (1980)
    Hoboken, NJ : Wiley-Blackwell
    AIChE Journal 26 (1980), S. 567-576 
    Details
    ISSN: 0001-1541
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: This paper extends previous modeling calculations of concentration profiles and reaction rates in tubular flow reactors by including very fast wall reactions such as surface catalyzed atom recombinations. The plug flow assumption is investigated and found to be valid in tubular flow reactors when the dimensionless wall reaction rate is less than on (H 〈 1), and the dimensionless ratio of homogeneous reaction rate to diffusion rate (Damkohler number) is greater than one (α 〉 1). If these criteria are not met, this work provides a correlation yielding a correction factor which can be applied to the mean residence time. The method is applied to experimental data relating to the deactivation probability of two types of atoms on teflon and quartz. Values of 1.0 + 0.2 × 10-4 and 1.7 + 0.4 × 10-4 for the deactivation probabilities of 0 and N atoms, respectively, are reported.
    Additional Material: 10 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/aic.690260407
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  • 2
    Electronic Resource
    Electronic Resource
    An Effecient and Safe Method for the Preparation of Alkyl Vinyl Sulfides (1996)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 338 (1996), S. 172-174 
    Details
    ISSN: 0941-1216
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prac.19963380133
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  • 3
    Electronic Resource
    Electronic Resource
    Preparation and 29Si NMR spectroscopical investigations of (diethylamino)-methylchlorotetra- and pentasilanes (1997)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 339 (1997), S. 637-641 
    Details
    ISSN: 0941-1216
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The treatment of several branched methylchlorooligosilanes (Si4, Si5) with diethylamine leads to a partial or complete substitution of the chloro substituents for diethylamino groups under formation of the first known (diethylamino)-methylchlorooligosilanes containing more than two Si atoms. The condensation of (Et2N)2MeSi—SiMeCl(NEt2) (1d) with Li in THF yields the linear tetrasilane (Et2N)2MeSi—SiMe(NEt2)—SiMe(NEt2)—SiMe(Et2N)2(2a).The NMR investigations provided information of the general shift ranges of several Si units in (diethylamino)-methylchlorooligosilane systems as well as the number of stereoisomers of the prepared products.
    Additional Material: 2 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prac.199733901113
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  • 4
    Electronic Resource
    Electronic Resource
    Generation and investigation of various (alkylamino)phenylsilyllithium species - behaviour in coupling reactions with chlorosilanesDedicated to Professor G. Marx on the Occasion of his 60th Birthday (1998)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 340 (1998), S. 557-561 
    Details
    ISSN: 0941-1216
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The partially diethylamino substituted phenyl-chloromono- and -disilanes Cl2Ph(NEt2)Si(2) Cl2Ph(NEt2)2Si(3), [ClPh(NEt2)Si-]2 (7) and Cl(NEt2)PhSi—SiPh(NEt2)2 (8) were synthesized. 3 and 8 are able to react with lithium powder to form the corresponding silyllithium compounds. The resulting species were characterized in solution by 13C and 29Si NMR spectroscopy. To prove the expected substitution patterns of the silyllithium compounds some coupling reactions with chlorosilanes were carried out and the resulting new oligosilanes were characterized by means of NMR spectroscopy and MS.
    Additional Material: 3 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prac.19983400609
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  • 5
    Electronic Resource
    Electronic Resource
    Über den Einfluß des Flächenverhältnisses auf die Stromdichte in galvanischen Zellen und Belüftungszellen (1977)
    Weinheim [u.a.] : Wiley-Blackwell
    Materials and Corrosion/Werkstoffe und Korrosion 28 (1977), S. 12-17 
    Details
    ISSN: 0947-5117
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: Influence of the area ratio on the current density in galvanic and aeration cellsWith a view to corrosion phenomena on conventional metal combinations the corrosion current density has been studied as a function of the cathode: anode area ratio in aeration cells (Fe/Zn, Fe/Fe, Zn/Zn, with Na-sulfate and NaCl as electrolytes) and in galvanic cells (Cu/Fe, Cu/Zn, with Cu—, ammonium and zinc sulfate as electrolytes). It was the aim of the investigation to find out the extent to which the theoretical ideas of Mansfeld and Akimov concerning film rupture and diffusion control may be applicable. It is found that mansfeld's concept must be extended to include the effective electrode potentials in order to allow an interpretation of corrosion current density in aeration cells. In the case of galvanic cells, however, there is a limitation attributable to the cell resistance which is determined by independent resistance measurements. The corrosion behaviour of the metals studied is interpreted in terms of the measured current densities.
    Notes: Im Hinblick auf die Korrosionsvorgänge an gängigen Metallkombinationen wurde die Korrosionsstromdichte in Abhängigkeit vom Flächenverhältnis Kathode: Anode in Belüftungszellen (Fe/Zn, Fe/Fe, Zn/Zn, mit Na-Sulfat und NaCl als Elektrolyt) und in galvanischen Zellen (Cu/Fe, Cu/Zn, mit Kupfer-, Ammonium- und Zinksulfat als Elektrolyt) untersucht. Dabei sollte festgestellt werden, inwieweit die theoretischen Vorstellungen von Mansfeld und Akimov bezüglich der Durchtritts- und Diffusionskontrolle hierauf anwendbar sind. Es wird gefunden, daß zur Interpretation der Korrosionsstromdichte der Belüftungszellen das Konzept von Mansfeld um die tatsächlichen Elektrodenpotentiale erweitert werden muß. Bei den galvanischen Zellen ergibt sich eine Begrenzung durch den Zellenwiderstand, der durch unabhängige Widerstandsmessungen nachgewiesen wird. Das Korrosionsverhalten der untersuchten Metalle wird auf der Grundlage der gemessenen Stromdichten gedeutet.
    Additional Material: 11 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/maco.19770280104
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  • 6
    Electronic Resource
    Electronic Resource
    Darstellung und Charakterisierung oligomeree und polymerer Ethinylsilane mit Si2—Si4-Einheiten (1997)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 339 (1997), S. 603-606 
    Details
    ISSN: 0941-1216
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Preparation and Characterization of Oligomeric as well as Polymeric Ethynylsilanes Containing Si2—Si4 UnitsThe treatment of methylchlorodisilanes with ethynyldigrignard (BrMgC≡CMgBr) resulted in oligomeric as well as polymeric ethynyldisilanes. The kind of this products is related to the chloro functionality of the starting disilane. The reaction of SiClMe(SiCl2Me)2 as well as SiMe(SiCl2Me)3 yielded polymers beside small amounts of the monomeric products (HC≡C)MeSi[SiMe(C≡CH)2]2 and MeSi[SiMe(C≡CH)2]3.
    Additional Material: 5 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prac.199733901108
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  • 7
    Electronic Resource
    Electronic Resource
    Untersuchungen über den Reaktionsmechanismus bei der Oxydation mit gasförmigem Sauerstoff (1901)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 27 (1901), S. 397-419 
    Details
    ISSN: 0863-1778
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19010270141
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  • 8
    Electronic Resource
    Electronic Resource
    Regiochemistry of Twofold Additions to [6,6] Bonds in C60: Influence of the Addend-Independent Cage Distortion in 1,2-MonoadductsDedicated to Professor Michael Hanack on the occasion of his 65th birthday (1996)
    Weinheim : Wiley-Blackwell
    Chemistry - A European Journal 2 (1996), S. 1537-1547 
    Details
    ISSN: 0947-6539
    Keywords: additions ; fullerenes ; regioselectivity ; semiempirical calculations ; Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Three series of regioisomeric bisadducts of C60, namely, C62(anisyl)4 and the mixed systems C62(anisyl)2-(COOEt)2, and C61(COOEt)2(NCOOEt), were synthesized starting from the 1,2-monoadducts C61(COOEt)2 (1), C61-(anisyl)2 (2), and C60(NCOOEt) (4) by using the Bingel and Bamford-Stevens reactions, and nitrene additions. In the case of C61(COOEt)2(NCOOEt) the complete series of nine possible regioisomers were isolated for the first time. For steric reasons the cis-1 isomers of C62(anisyl)4 and C62(anisyl)2(COOEt)2 were not formed. The transannular [6,6] bonds in the cis-1 isomer 42 of C61(COOEt)2(NCOOEt) are closed. The properties and regioselectivities of formation of these bisadducts and their monoadduct precursors were compared with those of the series C62-(COOEt)4 and C60(NCOOEt)2, which we synthesized previously. In the additions to 1, 2, and 4 the preferred positions of attack are e and trans-3 for sterically demanding addends (e.g., combinations of C(anisyl)2 and C(COOEt)2) and cis-1, e, and trans-3 for sterically less demanding addends (e.g., combinations of N(COOEt) and C(COOEt)2). A detailed analysis of the MO structures, the experimental and calculated geometries of monoadduct precursors, and the stabilities of reaction products leads to the conclusion that the addend-independent cage distortion itself is responsible for the observed regioselectivities of bisadduct formations.
    Additional Material: 10 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/chem.19960021211
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  • 9
    Electronic Resource
    Electronic Resource
    Monocyclopentadienylstibine  -  Synthese und dynamisches Verhalten (1975)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 108 (1975), S. 2439-2447 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Monocyclopentadienylstibines  -  synthesis und dynamic BehaviourMonocyclopentadienylstibines 3a-f are synthesized by the reaction of the cyclopentadienyllithium compounds 1a-e with dimethylbromostibine (2) or trichlorostibine (5); compound 3f was also prepared by the reaction of 5 with cyclopentadienyltrimethylsilane (4). The cp-stibines are considerably more air-sensitive but thermally more stable than monocyclopentadienylarsines. 1H n. m. r., i. r., and mass spectra are described. Because of sigmatropic rearrangements of the dimethyl- and dichloroantimony group the molecules have a fluxional structure.
    Notes: Monocyclopentadienylstibine 3a-f werden durch Umsetzung der Cyclopentadienyllithium-Verbindungen 1a-e mit Dimethylbromstibin (2) bzw. Antimontrichlorid (5) dargestellt, Verbindung 3f auch durch Reaktion von 5 mit Cyclopentadienyltrimethylsilan (4). Im Vergleich zu Monocyclopentadienylarsinen sind die Cp-Stibine 3a-f noch luftempfindlicher, thermisch dagegen merklich beständiger. 1H-NMR-, IR- und Massenspektren werden beschrieben. Aufgrund von sigmatropen Umlagerungen der Dimethyl- bzw. Dichlorantimongruppierung liegen Moleküle mit fluktuierender Struktur vor.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19751080731
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  • 10
    Electronic Resource
    Electronic Resource
    Zur Reaktion zwischen Bortrifluorid und Bis(trimethylsilyl)-amin (1972)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 105 (1972), S. 115-124 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: The Reaction of Boron Trifluoride with Bis(trimethylsilyl)amineBF3 reacts with bis(trimethylsilyl)amine below 0° to give [(CH3)3Si]2NH·BF3 (1). Above 0° the adduct (CH3)3SiNH2·BF3 (3) is formed by elimination of (CH3)3SiF besides the borazines 6-8 and small amounts of the aminoborane 4 and BF3·NH3. The thermal decomposition of 3 in dioxane leads to the formation of BF3·NH3. The reaction of 1 and 3 with the adduct of BF3 and ethyldiisopropylamine gives 4 resp. 8 in high yields. 8 can also be obtained by the thermal decomposition of 4 and by the fluorination of 2.4.6-trichloro-1.3.5-tris(trimethylsilyl)borazine (9) with NaF. 4 reacts with [(CH3)3Si]2NH to give the bis-(amino)borane 10. - The i.r., Raman, n.m.r. and mass spectra are reported.
    Notes: BF3 reagiert mit Bis(trimethylsilyl)-amin unterhalb 0° zu [(CH3)3Si]2NH·BF3 (1). Oberhalb 0° bildet sich unter Abspaltung von (CH3)3SiF das Addukt (CH3)3SiNH2·BF3 (3) neben den Borazinderivaten 6-8 sowie kleinen Mengen des Aminoborans 4 und BF3·NH3. Die thermische Zersetzung von 3 in Dioxan führt u.a. zu BF3·NH3. Setzt man 1 und 3 mit dem Addukt aus BF3 und Äthyldiisopropylamin um, so erhält man 4 bzw. 8 in guten Ausbeuten. 8 läßt sich auch durch therm. Zersetzung von 4 und durch Fluorierung von 2.4.6-Trichlor-1.3.5-tris(trimethylsilyl)-borazin (9) mit NaF darstellen. 4 reagiert mit [(CH3)3Si]2NH zu dem Bis(amino)-boran 10. - Die IR-, Raman-, NMR- und Massenspektren werden mitgeteilt.
    Additional Material: 4 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19721050114
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