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  • 1
    Electronic Resource
    Electronic Resource
    Zur Kenntnis der 2-Mercapto-tetronsäure und ihrer Derivate (1963)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 96 (1963), S. 363-373 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Aus 2-Isothioureido-tetronsäure (V) entsteht durch alkalische Hydrolyse 2-Mercapto-tetronsäure (VI), die sich unter intermolekularer Schwefelwasserstoff-abspaltung leicht zu 22′-Bis-tetronsäure-sulfid (VII) umsetzt. Aus den Alkalisalzen der 2-Mercapto-tetronsäure (VI) lassen sich stabile Acyl- und Alkyl-derivate darstellen. Die Oxydation von VI führt zum 22′-Bis-tetronsäure-disulfid (IXa). Die IR-Spektren stabiler 2-Mercapto-tetraonsäure-Derivate deuten -übereinstimmend mit dem chemischen Verhalten  -  auf die Enolform dieser Verbindungen hin.
    Additional Material: 4 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19630960145
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  • 2
    Electronic Resource
    Electronic Resource
    Beitrag zur Thiazolringschluß-Reaktion von trans-fixierten α-Isothioureido-β-dicarbonylverbindungen (1963)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 96 (1963), S. 357-362 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Cyclische, „trans-fixierte“ α-Isothiuronium -β-dicarbonyl-halogenide bilden in saurer wäßriger oder alkoholischer Lösung 2-Amino-thiazole. Aus 2-Isothiuronium-tetronsäure-bromid entsteht  -  wahrscheinlich über ein intermediär gebildetes, kondensiertes Tetron-Thiazolringsystem  -  in wäßriger Lösung 2-Amino-4-hydroxymethyl-5-carboxy-thiazol, das erst beim Erhitzen decarboxyliert wird. Mit Alkoholen als Lösungsmitteln erhitzt, bilden sich Ester. Die Cyclisierung von 2-Isothioureido-dimedon-dihydrochlorid führt zum 2-Amino- 55-dimetyhl -7-oxo- 4 5 67-tetrahydro-benzthiazol.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19630960144
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  • 3
    Electronic Resource
    Electronic Resource
    Reaktionen von Fluorphosphoranen mit (Trimethylsilyloxy)essigsäure(trimethylsilyl)ester: Synthese, NMR-spektroskopische Studien und Röntgenstrukturuntersuchungen an mono- und spirocyclischen (Acyloxy)phosphoranen[1] (1992)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 125 (1992), S. 801-808 
    Details
    ISSN: 0009-2940
    Keywords: Phosphoranes, organofluoro- ; Spirophosphoranes ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Reactions of Fluorophosphoranes with Trimethylsilyl (Trimethylsilyloxy)acetate: Structures, NMR-Spectroscopic Studies and X-ray Investigations of Mono- and Spirocyclic (Acyloxy)phosphoranes[1]The reaction of the tetrafluorophosphoranes RPF4 (R = Me, Ph) with trimethylsilyl (trimethylsilyloxy)acetate (1) yields the corresponding monocyclic fluoro(acyloxy)phosphoranes 2 and 3 by cleavage of the Si - O bond and elimination of (CH3)3SiF. 2 and 3 were investigated by NMR spectrometry. The spirocyclic (acyloxy)phosphoranes 4-13 are formed analogously by the reaction of 1 with the fluorophosphoranes RPF4 [R = F, Me, Et, iPr, Me3SiCH2, CH2Cl, CHCl2, H2C = CH, C6H5, 2,5-(CH3)2C6H3] in a molar ratio of 2:1. Spirophosphorane 14 is synthesized by the reaction of with PhN3 in the presence of a base. The trifluorophosphoranes R2PF3 (R = Me, Ph) react with 1 to form the monocyclic fluoro(acyloxy)phosphoranes 15 and 16, where the fluorine atom occupies an axial position at trigonal-bipyramidal (TBP) phosphorus. X-ray structure analyses of 4 and 7 reveal TBP geometry at phosphorus. The acyloxy ligand is found to form a chelate ring, whereby one axial and one equatorial site at TBP phosphorus are bridged.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19921250408
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  • 4
    Electronic Resource
    Electronic Resource
    Über die chemischen Gleichgewichte zwischen Bleisulfid und seinen Röstprodukten. I (1919)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 105 (1919), S. 145-166 
    Details
    ISSN: 0863-1786
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: 1. Die Messungen der Reaktionstensionen, welche bei der Umsetzung von Schwefelblei mit seinen Oxydationsprodukten auftreten, wurden mit Erhitzungsröhrchen aus Calciumphosphat wiederholt. Dadurch werden die Fehler, welche bei der Verwendung von Silikatgefäßen auftreten, vermieden.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19191050110
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  • 5
    Electronic Resource
    Electronic Resource
    Isolation of a cyclitol antibiotic: 2,3,4,5-tetrahydroxycyclohexanemethanol (1973)
    New York, NY [u.a.] : Wiley-Blackwell
    Biotechnology and Bioengineering 15 (1973), S. 1075-1080 
    Details
    ISSN: 0006-3592
    Keywords: Chemistry ; Biochemistry and Biotechnology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: The isolation and structure determination of a new microbial product, (+)- (123/45)-2,3,4,5-tetrahydroxy-1-cyclohexanemethanol is described. This product was detected in the fermentation broth of a newly isolated actinomycete by its antibacterial activity. A novel isolation method was developed and crystalline product was obtained in good yield. The structure was determined by spectroscopic examination of the product and its acetyl and trimethylsilyl derivatives. The racemic form of this compound had already been synthezised by G. E. McCasland et. al., as analog of galactose.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bit.260150606
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  • 6
    Electronic Resource
    Electronic Resource
    Energy-efficient ethanol-water fractionation by a carrier-gas method (1991)
    Hoboken, NJ : Wiley-Blackwell
    AIChE Journal 37 (1991), S. 281-284 
    Details
    ISSN: 0001-1541
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/aic.690370216
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  • 7
    Electronic Resource
    Electronic Resource
    Investigations on precious metal/alumina interactions on three-way automotive emission control catalysts, BMA catalysts and model samplesDedicated to Professor Dr. Dr. h. c. Hanns Hofmann on the occasion of his 70th Birthday (1994)
    Weinheim : Wiley-Blackwell
    Chemical Engineering & Technology - CET 17 (1994), S. 161-168 
    Details
    ISSN: 0930-7516
    Keywords: Chemistry ; Industrial Chemistry and Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Combined XPS and SIMS measurements, partly supplemented by XRD investigations, were utilized to detect precious metal/support interactions on catalysts containing various precious metals. The Klemm-Bronger reaction between Pt and α-Al2O3 on methane/ammonia catalysts was used as a standard reference. Evidence was found for different stages of Pt/Al interactions and changing electronic properties of Pt on the surfaces of these Pt/α-Al2O3 catalysts by means of XPS and SIMS, and in the bulk material by XRD. The SIMS investigations on Pt and Rh on γ-Al2O3 showed that, even at temperatures around 500 °C, Rh/Al interactions can appear to a small extent in the topmost atomic layers, whereas the Pt/γ-Al2O3 specimens did not show any measurable effects. After on-road operation, enhanced SIMS cluster-ion signals as well as anomalous XPS signal contributions were measured on the surfaces of used three-way automotive emission control catalysts. These signals did not appear for the fresh catalysts. By analogy with the related results reported on the methane/ammonia catalysts, the ion signals were used as qualitative surface probes indicating the presence of precious metal/support interactions, especially between Rh and Al.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/ceat.270170304
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  • 8
    Electronic Resource
    Electronic Resource
    Rearrangements of 2- and 3-FurfurylideneDedicated to Prof. Dr. H. Bürger on the occasion of his 60th birthday. (1997)
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1997 (1997), S. 897-900 
    Details
    ISSN: 0947-3440
    Keywords: Methylenecyclopropene ; Carbene rearrangement ; Furfurylidene ; Matrix isolation ; Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The photo- and thermochemistry of diazo(2-furyl)methane (3) and diazo(3-furyl)methane (6) was investigated using the matrix isolation technique. Photolysis of 3 results in the formation of (Z)-pent-2-en-4-yn-1-al (2) in a clean reaction, in agreement with the observation of Shechter et al. Photolysis or pyrolysis of diazo compound 6 yields (s-Z)-(α-formyl)methylenecyclopropene (s-Z-13) as the only detectable product. Carbene 14 and cyclopropene 15 are proposed as intermediates, but not stable under the reaction conditions and thus not directly observed. The reaction sequence 6→13 provides a novel and simple route to methylenecyclopropenes.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jlac.199719970518
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  • 9
    Electronic Resource
    Electronic Resource
    2,5-Bisdiazomethylfuran: A Novel Entry to the C6H4O SurfaceDedicated to Prof. Dr. P. Welzel on the occasion of his 60th birthday. (1997)
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1997 (1997), S. 901-905 
    Details
    ISSN: 0947-3440
    Keywords: Matrix isolation ; Carbenes ; Rearrangements ; Furfurylidene ; Ketenes ; Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Warming the dilithium salt 7 of furan-2,5-dicarboxaldehyde bis(tosylhydrazone) to 110°C and subsequently trapping the products in solid argon at 10 K resulted in the formation of 1-diazo-hex-3-en-5-yn-2-one (9). The intermediate 2,5-bis(diazomethylfuran) (6) is too labile to be directly observed under these conditions. The formation of 9 from 6 is rationalized by the loss of one nitrogen molecule and rapid rearrangement of the intermediate carbene 8. Photolysis of 9 leads to loss of the second nitrogen molecule and rearrangement of the resulting carbene 12. The major path is the Wolff rearrangement to hexa-1,3-dien-5-yn-1-one (11); the minor path is the intramolecular cycloaddition of the carbene center to the triple bond to 1H-bicyclo[3.1.0]hexa-3,5-dien-2-one (2). UV photolysis of 2 results in the ring opening to yield again ketene 11. The mechanism of this rearrangement was investigated by deuterium labeling.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jlac.199719970519
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  • 10
    Electronic Resource
    Electronic Resource
    4,4-dimethylbicyclo[3.1.0]hexa-1(6),2-diene - a highly strained 1,3-bridged cyclopropene (1996)
    Weinheim : Wiley-Blackwell
    Chemistry - A European Journal 2 (1996), S. 967-973 
    Details
    ISSN: 0947-6539
    Keywords: ab initio calculations ; carbenes ; cyclopropenes ; matrix isolation ; rearrangements ; Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The photochemical rearrangement of 4,4-dimethylcyclogexa-2,5-dienylidene (3) to 4,4-dimethylbicyclo-[3.1.0]hexa-1(6),2-diene (5) was investigated by means of the matrix isolation technique. Carbene 3 was generated in argon matrices at 10 K by photolysis of the corresponding diazop compound γ 〉550 nm) and was characterized by IR and UV/Vis spectroscopy and its characteristic thermal reaction with triplet oxygen. Long-wavelength irradiation (γ 〉 515 nm) induced an irreversible rearrangement of carbene 3 to the highly strained cyclopropene 5. This is in contrast to the previously investigated 1 H-bicyclo[3.1.0]hexa-3,5-dien-2-one (1), which is thermally labile even at 10 K and rearranges back to 4-oxo-2,5-cyclohexa-dienylidene. The experimental findings were confirmed by ab initio calculations at the MP 2/6-31 G(d) level. MP 2 and experimental IR frequencies are in good agreement. The strain energies of 5 and 1 are 75 and 78 kcalmol-1, more than 20 kcal mol-1 larger than that of cyclopropene. The somewhat greater stability of 5 than 1 is a consequence of better π delocalization in the diene unit of the bicyclic system.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/chem.1460020809
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