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  • 1
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 105 (1972), S. 673-685 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Synthesis of 2.-3(Carboxymethylene)- and 2.-3(2-Hydroxyethylidene)-2.3-dideoxy-D-mannose  -  Monosaccharides with a Cyclopropane RingThe anhydro derivative 1 yielded the cyclopropane carboxylic ester 2 in a PO-activated olefination reaction. Under mild conditions 2 could be hydrolised to the free carboxylic acid 5. By reduction the cyclopropyl carbinol 13 and the cyclopropane carbaldehyde 21 were formed. The latter could be rearranged to the cyclobutene derivative 25. Attempts to synthesize a cyclopropanol were unsuccessful.
    Notes: Durch PO-aktivierte Olefinierung entstand aus der Anhydro-Verbindung 1 der Cyclopropancarbonsäureester 2, der unter milden Bedingungen zur freien Carbonsäure 5 hydrolysiert werden konnte. Reduktion lieferte das Cyclopropylcarbinol 13 und den Cyclopropan-carbaldehyd 21, der zum Cyclobutenderivat 25 umgelagert wurde. Die Synthese eines Cyclopropanols gelang nicht.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 105 (1972), S. 1810-1814 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Syntheses of Bicyclic Heterocyclic Ring Systems, I. Imidazo[1.2-b]-s-triazolesWhereas in basic media treatment of 3.5-diamino-s-triazole (1) with acyloins (2) merely results in acylation with formation of 4, under acidic reaction conditions condensation takes place to yield imidazo[1.2-b]-s-triazoles (3). The latter can be characterized via the 2-aminogroup as Schiff′s bases (3c and f). An independent synthesis of 3 is the reaction of 1 with the corresponding α-chlorocarbonyl compounds 5.
    Notes: Während bei der Umsetzung von 3.5-Diamino-s-triazol (1) mit Acyloinen (2) in basischem Medium nur Acylierung unter Bildung von 4 eintritt, erfolgt unter sauren Reaktionsbedingungen Kondensation zu Imidazo[1.2-b]-s-triazolen (3). Diese können über die 2-Aminogruppe als Schiffsche Basen (3c und f) charakterisiert werden. Eine Gegensynthese von 3 ist die Reaktion von 1 mit den entsprechenden α-Chlor-carbonylverbindungen 5.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 105 (1972), S. 2998-3013 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Di- and Polyamino Sugars, XVIII. Syntheses of 2.4-Diamino-2.4-didesoxy-D-galactose and -D-glucoseSyntheses of the title compounds were accomplished by single resp. double inversion at C-4 of suitable derivatives of D-glucose. Both sugars were obtained as free hydrochlorides.
    Notes: Die Synthese der Titelverbindungen erfolgte durch ein- bzw. zweimalige nucleophile Substitution am 4-C geeignet substituierter Derivate der D-Glucose. Beide Zucker wurden als freie Hydrochloride erhalten.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 105 (1972), S. 2546-2557 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Structure Elucidation of the Gentamycins - Structure and Synthesis of Gentosamine and GarosamineBy methylation and degradation 3-deoxy-3-methylamino-D-xylose - identical with Gentosamine - was prepared from 3-amino-3-deoxy-D-glucose. Dehydrogenation to the 4-ketone and Grignard reaction yielded 3-deoxy-3-methylamino-4-C-methyl-L-arabinose and -D-xylose. The configuration of the L-arabino derivative - identical with Garosamine - was proved by i.r. spectroscopy and by cyclization to a 3.4-oxazolidone.
    Notes: Durch Methylierung und Kettenverkürzung wurde aus der 3-Amino-3-desoxy-D-glucose die 3-Desoxy-3-methylamino-D-xylose - identisch mit dem Gentosamin - dargestellt. Dehydrierung zum 4-Keton und Grignardierung ergaben die 3-Desoxy-3-methylamino-4-C-methyl-L-arabinose und -D-xylose. Die Konfiguration des L-arabino-Derivates - identisch mit dem Garosamin - wurde IR-spektroskopisch und durch Cyclisierung zum 3.4-Oxazolidon bewiesen.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 105 (1972), S. 3974-3978 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 6
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Synthesis of 2.-3(2-Aminoethylidene)-2.3-dideoxy-D-mannose and Derivatives of 2.-3(Aminomethylene)-2.3-dideoxy-D-mannose  -  Amino Sugars with a Cyclopropane RingThe syntheses of the title compounds were realised first by reduction of the cyclopropane carboxylic acid ester 1 to the alcohol 4 and subsequent introduction of the nitrogen function via a displacement reaction at C-7 and second by a Curtius degradation of the cyclopropane carboxylic acid azide 14. The aminoethylidene monosaccharide 10 was obtained in free, protected form, however, preparation of the free cyclopropyl amine was not possible due to its instability.
    Notes: Die Synthese der Titelverbindungen erfolgte einmal durch Reduktion des Cyclopropancarbonsäureesters 1 zum Alkohol 4 und Einführung der Stickstoff-Funktion durch eine Substitution an C-7 und zum anderen durch Curtius-Abbau des Cyclopropancarbonsäureazids 14. Während das Aminoäthyliden-Monosaccharid 10 in freiem Zustand erhalten werden konnte, war die Darstellung des freien Cyclopropylamins infolge seiner Zersetzlichkeit nicht möglich.
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 105 (1972), S. 3014-3026 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Aromatic Complexes of Metals, CXVCXIV. Mitteil.: E. O. Fischer und R. J. J. Schneider, Chem. Ber. 103, 3684 (1970). Über Di-π-cyclopentadienyl-μ-π-cyclopentadien-dimetall-Komplexe des Palladiums, Nickels und Platins, „Tetracyclopentadienyl-dipalladium“ und π-Cyclopentadienyl-π-(2-methyl-1-acetyl-allyl)-palladium. On Di-π-cyclopentadienyl-μ-π-cyclopentadienedimetal Complexes of Palladium, Nickel, and Platinum as well as on „Tetracyclopentadienyldipalladium“ and π-Cyclopentadienyl-π-(2-methyl-1-acetylallyl)palladiumMetal halides MX2 = PdBr2, NiI2 yield with alkali cyclopentadienides and cyclopentadiene a new diamagnetic type of compounds according to An analogously composed platinum complex was detected too. Spectroscopic investigations support a molecular structure with a metal-metal bond, two π-bonded C5H5-rings and a π-bonded C5H6-ring as bridge in a manner that the compounds can be described as di-π-cyclopentadienyl-μ-π-cyclopentadienedimetal complexes. - Variation of the reaction conditions led to Pd2C20H20 mixed with Pd2(C5H5)2C5H6. Pd2C20H20 was proved by mass spectroscopy and so the question of a „tetracyclopentadienyldipalladium“ is settled. It should, however, exist as di-π-cyclopentadienyl-μ-π-(5-cyclopentadienylcyclopentadiene)dipalladium. According to violet, diamagnetic π-cyclopentadienyl-π-(2-methyl-1-acetylallyl)palladium was obtained.
    Notes: Metallhalogenide MX2 = PdBr2, NiJ2 ergeben mit Alkalicyclopentadieniden und Cyclopentadien einen neuen diamagnetischen Verbindungstyp nach Ein analog zusammengesetzter Platin-Komplex konnte ebenfalls nachgewiesen werden. Spektroskopische Untersuchungen sprechen für einen Molekülaufbau mit Metall-Metall-Bindung, zwei π-gebundenen C5H5-Ringen und π-gebundenem C5H6 als Brücke, so daß die Verbindungen als Di-π-cyclopentadienyl-μ-π-cyclopentadien-dimetall-Komplexe aufzufassen sind. - Durch Änderung der Reaktionsbedingungen im Gemisch mit Pd2(C5H5)2C5H6 entstehendes Pd2C20H20 ließ sich massenspektroskopisch sichern und damit die Frage nach einem „Tetracyclopentadienyl-dipalladium“ beantworten, das jedoch als Di-π-cyclopentadienyl-μ-π-(5-cyclopentadienyl-cyclopentadien)-dipalladium vorliegen dürfte. - Nach entsteht violettes, diamagnetisches π-Cyclopentadienyl-π-(2-methyl-l-acetyl-allyl)-palladium.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
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