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  • Organic Chemistry  (720)
  • Chemical Engineering  (356)
  • Life and Medical Sciences
  • 1995-1999
  • 1980-1984
  • 1970-1974  (1,333)
  • 1930-1934
  • 1973  (1,333)
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  • 1995-1999
  • 1980-1984
  • 1970-1974  (1,333)
  • 1930-1934
Year
  • 1
    Electronic Resource
    Electronic Resource
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 56 (1973), S. 495-499 
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Complex formation parameters of macrotetrolide antibiotics with alkali and alkaline earth metal cations are given. The stability constants for the complexes in methanol and ethanol at 30°, as determined by vapour pressure osmometry, and ΔH0, ΔG0, and ΔS0 for some interactions in methanol and ethanol at 25°, measured by microcalorimetry, are compared and discussed.
    Additional Material: 3 Tab.
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  • 2
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 765 (1973), S. 15-19 
    ISSN: 0075-4617
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Thermal Rearrangement of Arylaldoketene DimersArylaldoketene dimers 5 and 1 with β-lacton- or hydroxy-cyclobutenon structures and their acylated and alkylated derivatives can be thermally rearranged yielding the corresponding derivatives of naphthalene-1,3-diol 3.
    Notes: Aryl-aldoketen-Dimere 5 und 1 mit β-Lacton- bzw. Hydroxy-cyclobutenon-Struktur sowie die acylierten und alkylierten Derivate der letzteren lassen sich thermisch in Abkömmlinge des 1.3-Naphthalin-diols 3 umlagern.
    Additional Material: 1 Tab.
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  • 3
    Electronic Resource
    Electronic Resource
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 315 (1973), S. 137-143 
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: 3-Desoxy-L-threo-pentose 5 wird über mehrere Zwischenstufen aus 1,2;5,6-Di-O-iso-propyliden-3-desoxy-D-galaktofuranose 1 dargestellt. Durch Reduktion der 3-Desoxy-pen-tose 5 mit Natriumborhydrid gewinnt man den 3-Desoxy-L-threo-pentit 6. Die 3-Desoxy-L-threo-pentose 5 wird als kristallisiertes p-Nitrophenyl-(8) und 2,4-Dinitrophenyl-osazon 9, die 1,2-O-Isopropyliden-3-desoxy-L-threo-pentodialdofuranose 3 als Bis-dimedon-Verbindung 11 charakterisiert. Die 1,2-O-Isopropyliden-3-desoxy-L-threo-pentose 4 bildet ein 5-O-Tosylat 12 und einen 5-O-Trityl-äther 13, die beide gut kristallisieren.
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  • 4
    Electronic Resource
    Electronic Resource
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 315 (1973), S. 179-184 
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: 3-Desoxy-L-threo-pentose-dialkylmercaptale 1 und 1,2-O-Isopropyliden-3-desoxy-L-threo-pentodialdofuranose-dialkylmercaptale 4 werden nach speziellen Verfahren dargestellt. 1,2-O-Isopropyliden-3-desoxy-L-threo-pentofuranose wird in das entsprechende 5-O-Acetat 5 und in das 5-O-Benzoat 6 übergeführt, die sich zur 5-O-Acetyl- (7) bzw. 5-O-Benzoyl-3-desoxy-L-threo-pentofuranose 8 hydrolysieren lassen. Durch Acetylieren oder Benzoylieren von 7 und 8 gewinnt man die Acyl-Verbindungen 9 bis 12. Die 1,2-O-Iso-propyliden-3-desoxy-L-threo-pentodialdofuranose 2 läßt sich nach CLAISEN-TISCHTSCHENKO in einen entsprechend substituierten 3-Desoxy-penturonsäure-(3-desoxy-pentofuranosyl-ester) 3 überführen.
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  • 5
    ISSN: 0045-205X
    Keywords: Life and Medical Sciences
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology
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  • 6
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1973 (1973), S. 1702-1709 
    ISSN: 0075-4617
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: The Crystal and Molecular Structure of 2,2-Dimethylthietane-1,1-dioxideThe structure of 2,2-dimethylthietane-1,1-dioxide (1) has been determined by X-ray methods using least-squares refinement. The compound crystallizes rhombic, the space group being D152h-Pcab with a = 12.739, b = 9.594, c = 10.906 Å, and Z = 8. As expected the thietane ring is not planar.
    Notes: Die Struktur des 2,2-Dimethylthietan-1,1-dioxids (1) wurde röntgenographisch bestimmt und nach der Methode der kleinsten Quadrate verfeinert. Die Verbindung kristallisiert rhombisch in der Raumgruppe D152h-Pcab mit a = 12.739, b = 9.594, c = 10.906 Å und Z = 8. Der Thietanring ist erwartungsgemäß nicht eben.
    Additional Material: 2 Ill.
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  • 7
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1973 (1973), S. 1545-1551 
    ISSN: 0075-4617
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Syntheses of Heterocycles, 176.  -  The Chlorination of 4-Hydroxy-5,6,7,8-tetrahydro-2-quinolonesReaction of 4-hydroxy-1-phenyl-5,6,7,8-tetrahydro-2-quinolone (1) with SO2Cl2 yields the chloro compounds 2-4. Reduction of 2 and 4 gives 5, while thermolysis of 2 and 4 leads under elimination of HCl and aromatization to the 2-quinolones 6 and 7, respectively. The reaction of 2 with morpholine yields the aminal 8, which can be converted into the tetrahydro-2-quinolones 9 and 11, and the octahydroquinoline-2,4-dione 10. Aromatization of 10 with elimination of HCl and water affords 12 in 85% yield.
    Notes: Die Umsetzung des Tetrahydro-2-chinolons 1 mit SO2Cl2 liefert die chlorierten Derivate 2-4. Die Reduktion von 2 und 4 ergibt die Monochlorverbindung 5, während beim Erhitzen von 2 oder 4 unter HCl-Abspaltung Aromatisierung zu den 2-Chinolonen 6 bzw. 7 erfolgt. Die Reaktion von 2 mit Morpholin führt zum Aminal 8, aus welchem sich die Tetrahydro-2-chinolone 9 und 11 sowie das Octahydrochinolin-2,4-dion 10 gewinnen lassen. Bemerkenswert ist die in 85proz. Ausbeute erfolgende Aromatisierung von 10 unter HCl- und H2O-Abspaltung zu 12.
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  • 8
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1973 (1973), S. 1552-1556 
    ISSN: 0075-4617
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Syntheses of Heterocycles, 177.  -  Syntheses of 4-Chromanone-2-carboxylic AcidsUnder the conditions of the Fries reaction the phenyl hydrogen fumarates 1a-d give the benzoylacrylic acids 2a-d, which, on further reaction with sodium carbonate solution yield the 4-chromanone-2-carboxylic acids 3a-d.
    Notes: Die Fumarsäure-monophenylester 1a-d liefern bei der Friesschen Verschiebung die Benzoyl-acrylsäuren 2a-d, welche unter der Einwirkung von Na2CO3-Lösung zu den 4-Chromanon-2-carbonsäuren 3a-d weiterreagieren.
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  • 9
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 766 (1973), S. 32-44 
    ISSN: 0075-4617
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Photolysis of 1,2,3-Thiadiazoles, III1)The photolysis of aliphatic substituted 1,2,3-thiadiazoles 2 gives by elimination of nitrogen the 1,3-diradicals 3 as primary products. Subsequently the 1,3-diradicals yield, depending on the substituents, 1,4-dithiines (6), 1,3-dithiole dervivatives (5), symmetrical and unsym-metrical thiophenes (7 and 8, respectively). The isomeric thiophenes 7 and 8 are not photochemically interconvertible. The thermolysis of 4,5-diphenyl-1,2,3-thiadiazole (2, R1 = R2 C6H5), already described, is reinvestigated and a product with previously unknown structure is shown to be 4,5-diphenyl-2-diphenylmethylene-1,3-dithiole (5, R1 = R2 = C6H5).
    Notes: Die Photolyse von aliphatisch substituierten 1.2.3-Thiadiazolen 2 liefert durch Stickstoff-Eliminierung als primäre Photoprodukte die 1.3-Diradikale 3. Diese reagieren je nach ihren Substituenten zu 1.4-Dithiinen (6), 1.3-Dithiol-Derivaten (5) und symmetrischen oder unsymmetrischen Thiophenen (7 bzw. 8). Die isomeren Thiophene 7 und 8 lassen sich photochemisch nicht ineinander umwandeln. Die bereits beschriebene Thermolyse des 4.5-Diphenyl-1.2.3-thiadiazols (2, R1= R2= C6H5) wird nachgearbeitet und das Produkt mit bisher unbekannter Struktur als 4.5-Diphenyl-2-diphenylmethylen-1.3-dithiol (5, R1= R2= C6H5) identifiziert.
    Additional Material: 1 Ill.
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  • 10
    Electronic Resource
    Electronic Resource
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 315 (1973), S. 1166-1168 
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 1 Tab.
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