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  • 1985-1989  (23)
  • 1935-1939
  • 1890-1899  (35)
  • 1986  (23)
  • 1899  (7)
  • 1894  (28)
  • Chemistry  (58)
  • General Chemistry  (14)
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  • 1985-1989  (23)
  • 1935-1939
  • 1890-1899  (35)
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Keywords
  • 1
    Electronic Resource
    Electronic Resource
    Stoffwechselprodukte von Mikroorganismen. 236. Mitteilung235. Mitteilung: [1]. Schwefelhaltige Ansa-Verbindungen des Naphthomycin-Typus (1986)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 69 (1986), S. 1356-1364 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Metabolites of Microorganisms. Sulfur-Containing Ansa Compounds of the Naphthomycin TypeFrom a strain of Streptomyces (Tü 2357) in addition to naphthomycin A, 4 new yellow pigments were isolated and their structures determined by spectroscopic comparison with naphthomycin A. Whereas the naphthomycins D and E are simple derivatives of naphthomycin A, having OH and H, respectively, instead of Cl, the naphthomycins F and G contain an N-acetylcysteine residue linked to the aromatic moiety by a thioether group. Degradations with O3 yielded identical products from the naphthomycins A, D, F, and G, showing coincident configurations in parts of the molecules. Naphthomycin F shows some biological activity against gram-positive bacteria and fungi, although much weaker than naphthomycin A. The naphthomycins D, E, and G are inactive against microorganisms.
    Additional Material: 4 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/hlca.19860690610
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  • 2
    Electronic Resource
    Electronic Resource
    Sieben- (N2O2Si3) und achtgliedrige (N2O2Si4) Ringe aus einem (Hydroxysilyl)hydrazin und 1-Amino-3-fluorsiloxanen (1986)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 119 (1986), S. 872-877 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Seven- (N2O2Si3) and Eight-membered (N2O2Si4) Rings from a (Hydroxysilyl)hydrazine and 1-Amino-3-fluorosiloxanesHalogeno-functional siloxanes [(Me3C)2SiCl—O—SiHalR2, Hal = F, R = CMe3 (2), Hal = Cl, R = Ph (3)] are obtained in the reaction of dihalogenosilanes with (Me3C)2Si(Cl)OLi (1a). (Me3C)2Si(Cl)OH reacts smoothly with ammonia to form the aminosilanol (Me3C)2Si(NH2)OH (4). With fluorosilanes its lithium salt 4a yields the amino- and fluoro-functional siloxanes 5 - 8 [(Me3C)2Si(NH2) —O—SiFRR′, R = R′ = Me (5), R = R′ = CMe3 (6), R = F, R′ = CMe3 (7), R = F, R′ = N(SiMe3)2 (8)]. Primary amines react with 1 by intermolecular HCl elimination to give the 1-chloro-3-hydroxysiloxane 9, hydrazine reacts to form the N,N′-bis(hydroxysilyl)hydrazine 10, methylhydrazine to yield the N-(hydroxysilyl)-N-methylhydrazine 11, and N,N′-dimethylhydrazine to give 9. The reaction of the dilithium salt 10a with F3SiN(SiMe3)2 leads to the formation of the seven-membered N2O2Si3 ring 12. The 1,5,3,7,2,4,6,8-dioxadiazatetrasilocanes 13 and 14 are obtained by LiF elimination from lithiated 5 and 7, respectively.
    Notes: Halogenfunktionelle Siloxane [(Me3C)2SiCl - O—SiHalR2, Hal = F, R = CMe3 (2), Hal = Cl, R = Ph (3)] werden durch Reaktion der Dihalogensilane mit (Me3C)2Si(Cl)OLi (1a) erhalten. Mit Ammoniak reagiert (Me3C)2Si(Cl)OH (1) glatt unter Bildung des Aminosilanols (Me3C)2Si(NH2)OH (4), dessen Lithiumsalz 4a mit Fluorsilanen die amino- und fluorfunktionellen Siloxane 5 - 8 [(Me3C)2Si(NH2) - O—SiFRR′, R = R′ = Me (5), R = R′ = CMe3 (6), R = F, R′ = CMe3 (7), R = F, R′ = N(SiMe3)2 (8)] bildet. Primäre Amine reagieren mit 1 unter intermolekularer HCl-Abspaltung zum 1-Chlor-3-hydroxysiloxan 9, Hydrazin zum N,N′-Bis(hydroxysilyl)hydrazin 10, Methylhydrazin zum N-(Hydroxysilyl)-N′-methyl-hydrazin 11 und N,N′-Dimethylhydrazin zu 9. Die Reaktion des Dilithiumsalzes 10a mit F3SiN(SiMe3)2 führt zur Bildung des siebengliedrigen N2O2Si3-Ringes 12. Durch LiF-Eliminierung aus lithiiertem 5 und 7 entstehen die 1,5,3,7,2,4,6,8-Dioxadiazatetrasilocane 13 und 14.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19861190311
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  • 3
    Electronic Resource
    Electronic Resource
    Darstellung und Struktur neuer sechsgliedriger Metallaheterocyclen - Insertion von Platin in Selen-Stickstoff- und Schwefel-Stickstoff-Bindungen (1986)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 119 (1986), S. 366-373 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Preparation and Structure of New Six-membered Metallaheterocycles - Insertion of Platinum in Selenium-Nitrogen and Sulfur-Nitrogen BondsThe reaction of 1,2,5-selenadiazoles 2 and 4 and the bicycle 6 with (η2-ethene)bis(triphenylphosphane)platinum(0) leads to the cyclic coordination compounds (Ph3P)2PtSeN2(CR)2 (R = CN, 3; R = OCH2CF3, 5) and the bicycle (Ph3P)2PtC4Cl2N4S3 (7). The structure of 3 was determined by an X-ray structure analysis.
    Notes: Die Reaktion der 1,2,5-Selenadiazole 2 und 4 sowie des Bicyclus 6 mit (η2-Ethen)bis(triphenylphosphan)platin(0) führt zu den cyclischen Koordinationsverbindungen (Ph3P)2-PtSeN2(CR)2 (R = CN, 3; R = OCH2CF3, 5) und dem Bicyclus (Ph3P)2PtC4Cl2N4S3 (7). Von 3 wurde eine Röntgenstrukturanalyse angefertigt, die das Vorliegen eines sechsgliedrigen Ringes bestätigt.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19861190131
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  • 4
    Electronic Resource
    Electronic Resource
    Über die Trennung und Bestimmung von Chlor, Brom und Jod in Halogensalzen (1899)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 21 (1899), S. 79-83 
    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.18990210110
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  • 5
    Electronic Resource
    Electronic Resource
    Über Mangantrichlorid und Mangantetrachlorid (1899)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 22 (1899), S. 169-191 
    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.18990220110
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  • 6
    Electronic Resource
    Electronic Resource
    Notizen über Chromylchlorid, Chlorchromsäure und Amidochromsäure (1899)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 22 (1899), S. 192-199 
    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.18990220111
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  • 7
    Electronic Resource
    Electronic Resource
    Differences in the chromatographic and mass spectral properties of 3,3′,5,5′-tetrachlorodiphenoquinone and 2,3,7,8-tetrachlorodibenzo-p-dioxin (1986)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 13 (1986), S. 47-51 
    Details
    ISSN: 1052-9306
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Tetrachlorodiphenoquinones have the same exact mass and elemental composition as the toxic environmental contaminant 2,3,7,8-tetrachlorodibenzo-p-dioxin. However, analysis of 3,3′-5,5′-tetrachlorodiphenoquinone showed a pronounced tendency toward chemical reduction in the mass spectrometer to the quinol compound, producing a molecular ion two mass units higher than 2,3,7,8-tetrachlorodibenzo-p-dioxin. Distinct differences were also apparent between the mass spectral fragmentation patterns of 3,3′,5,5′-tetrachlorodiphenoquinone and 2,3,7,8-tetrachloridibenzo-p-dioxin. The 3,3′,5,5′-tetrachlorodiphenoquinone spectrum shows a successive loss of carbon monoxide, with the most prominent fragment corresponding to loss of two molecules of carbon monoxide plus chlorine. In the mass fragmentation of 2,3,7,8-tetrachlorodibenzo-p-dioxin carbon monoxide loss is suppressed, but loss of one molecule of carbon monoxide plus chlorine is a major fragment ion. During an alumina column clean-up procedure 3,3′,5,5′-tetrachlorodiphenoquinone did not coelute with the fraction containing 2,3,7,8-tetrachlorodibenzo-p-dioxin. This evidence indicates that tetrachlorodiphenoquinones are unlikely to interfere with mass spectrometric determination of 2,3,7,8-tetrachlorodibenzo-p-dioxin in environmental samples.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bms.1200130108
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  • 8
    Electronic Resource
    Electronic Resource
    Synthesen biologisch wichtiger Kohlenhydrate, 35. Synthese exocyclischer Saccharid-Enolether und deren Umsetzung zu verzweigten Kohlenhydraten (1986)
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1986 (1986), S. 613-624 
    Details
    ISSN: 0170-2041
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Syntheses of Biologically Important Carbohydrates, 35.  -  Synthesis of Exocyclic Saccharide Enol Ethers and Their Reaction to Branched-chain CarbohydratesWittig olefination of the 3-uloses 1 and 9 leads to the exocyclic (E)- and (Z)-enol ethers 2 and 3 or 11 and 10, respectively. On cis-hydroxylation these are uniformly transformed into the hydroxyformyl-branched gluco derivatives 4 and 8, respectively. Acidolysis of 2a as well as mercuri or iodo hydroxylation with subsequent reduction give the 3-C-formyl-branched sugars 12 and 13. Alternatively, the latter may also be obtained by treatment of the ulose 1 with tosylmethyl isocyanide via the cyano-branched compound 16. Addition of iodine/ silver isocyanate to 2a and subsequent methanolysis gives the epimeric 3-deoxy-3-iodo-3′-aminals 14 and 15 which on treatment with base yield the substituted aziridine 17 or the branched olefin sugar derivative 18, respectively.
    Notes: Durch Wittig-Olefinierung der 3-Ulosen 1 und 9 werden die exocyclischen (E)- und (Z)-Enolether 2 und 3 bzw. 11 und 10 gewonnen. Deren cis-Hydroxylierung führt einheitlich zu den Hydroxyformyl-verzweigten Derivaten mit gluco-Konfiguration 4 bzw. 8. Bei der Acidolyse sowie den Mercuri- oder Iodhydroxylierungen nebst Reduktion von 2a werden die 3-C-Formyl-verzweigten Zucker 12 und 13 erhalten, von denen 13 auch durch Umsetzung der Ulose 1 mit Tosylmethylisocyanid über die Cyan-verzweigte Komponente 16 erhalten werden kann. Mit Iod/Silberisocyanat werden aus 2a nach Methanolyse die epimeren 3-Desoxy-3-iod-3′-aminale 14 und 15 gewonnen. 14 reagiert mit Base zum substituierten Aziridin 17, 15 zum verzweigten Olefinzuckerderivat 18.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jlac.198619860403
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  • 9
    Electronic Resource
    Electronic Resource
    Fasting-induced dissociation of cationic and secretory events in pancreatic islets (1986)
    New York, NY [u.a.] : Wiley-Blackwell
    Cell Biochemistry and Function 4 (1986), S. 123-130 
    Details
    ISSN: 0263-6484
    Keywords: Fasting ; pancreatic islets ; insulin release ; 45Ca and 86Rb fluxes ; glucose ; 2-ketoisocaproate ; Chemistry ; Biochemistry and Biotechnology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Medicine
    Notes: In pancreatic islets removed from 48 h-fasted rats, as distinct from fed animals, the release of insulin evoked by D-glucose is more severely impaired than that evoked by 2-ketoisocaproate. This decreased secretory response to D-glucose contrasts with an unimpaired cationic response to the sugar in terms of the glucose-induced decrease in both 86Rb and 45Ca outflow from pre-labelled islets. Likewise, fasting only causes a modest decrease of the secondary rise in 45Ca outflow evoked by D-glucose in islets perifused at normal Ca2+ concentration. The latter decrease appears more marked, however, if the cationic response to glucose is expressed relative to that evoked by 2-ketoisocaproate in islets removed from rats in the same nutritional state. It is concluded that, in the process of nutrient-stimulated insulin release, neither the decrease in K+ conductance (inhibition of 86Rb outflow) nor the sequestration of Ca2+ by intracellular organelles and/or direct inhibition of Ca2+ outward transport (decrease in 45Ca outflow) represent the sole determinant(s) of the subsequent gating of Ca2+ channels (secondary rise in 45Ca efflux).
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cbf.290040208
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  • 10
    Electronic Resource
    Electronic Resource
    Bis(pentamethylcyclopentadienyl)diphosphenein Molekül mit fluktuierender Struktur und reaktiver P-C-BindungDiese Arbeit wurde von der Deutschen Forschungsgemeinschaft und dem Ministerium für Wissenschaft und Forschung des Landes Nordrhein-Westfalen gefördert. (1986)
    Weinheim : Wiley-Blackwell
    Zeitschrift für die chemische Industrie 98 (1986), S. 894-895 
    Details
    ISSN: 0044-8249
    Keywords: Chemistry ; General 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/ange.19860981006
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