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  • Electronic Resource  (11)
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  • Electronic Resource  (11)
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  • 1
    Electronic Resource
    Electronic Resource
    Reactions with 3,1-benzoxazin-4-ones. 3. Reactions of 6,8-dibromo-2-methyl-3,1-benzoxazin-4-ones with amines (1983)
    s.l. : American Chemical Society
    The @journal of organic chemistry 48 (1983), S. 4172-4174 
    Details
    ISSN: 1520-6904
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/jo00171a003
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Anaesthesia for coarctation (1974)
    Oxford, UK : Blackwell Publishing Ltd
    Anaesthesia 29 (1974), S. 0 
    Details
    ISSN: 1365-2044
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2044.1974.tb00756.x
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  • 3
    Electronic Resource
    Electronic Resource
    Mechanism of thermal dehydrochlorination (1997)
    Springer
    Journal of thermal analysis and calorimetry 48 (1997), S. 841-849 
    Details
    ISSN: 1572-8943
    Keywords: complexes ; dehydrochlorination ; DTA
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Co(II), Ni(II), Cu(II) and Zn(II) complexes ofo-hydroxyacetophenone Girard-P hydrazone were prepared by using the organic ligand and the corresponding transition metal chlorides. The protonation and formation constants were evaluated for the organic ligando-hydroxyacetophe-none Girard-P hydrazone and its transition metal complexes, respectively. The thermal behaviour of the test materials was established by means of DTA. Their semiconducting parameters were evaluated through DC-conductivity measurements, and their thermodynamic parameters were evaluated, assigned and interpreted. The mechanism of thermal dehydrochlorination of the metal chloride complexes was proposed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01997189
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  • 4
    Electronic Resource
    Electronic Resource
    Dissolution of calcite crystals in the presence of some metal ions (1994)
    Springer
    Journal of materials science 29 (1994), S. 6463-6467 
    Details
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract A constant composition method has been used for the study of the kinetics of calcium carbonate (calcite) dissolution in which the activities of ionic species in relatively undersaturated solutions are maintained constant. Over a range of relative undersaturation (0.032–0.158) the dissolution reaction appears to be controlled by a bulk diffusion process. The suggestion of a predominantly diffusion-controlled process was supported by the observed low activation energy (2.09 kcal mol−1). The influence of a number of metal ions on the reaction rate has been investigated. The retardation effect of these additives has been attributed to the blocking of active sites by adsorption of metal ions at the crystal surfaces. Inhibition of dissolution by metal ions can be interpreted in terms of a Langmuir isotherm.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00354005
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  • 5
    Electronic Resource
    Electronic Resource
    Thermophysical studies on the substitution of Al3+ in gallium iron garnets (1994)
    Springer
    Journal of materials science 29 (1994), S. 2939-2943 
    Details
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Gallium iron garnet and its Al3+-substituted derivatives have been prepared and sintered under oxygen pressure. On these materials, measurements were taken of infrared spectra, X-ray diffraction analysis, differential thermal analysis and the temperature dependence of d.c. electrical conductivity. The results obtained are explained, interpreted, compared and discussed in detail on the basis of structural conformation and the conduction mechanism prevailing.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01117604
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  • 6
    Electronic Resource
    Electronic Resource
    A new ester component in the stobbe condensation. I. The condensation of some aromatic aldehydes with diethyl β,β-dimethylglutarate (1982)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 324 (1982), S. 379-384 
    Details
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Eine neue Esterkomponente in der Stobbe-Kondensation. I. Kondensation einiger aromatischer Aldehyde mit Diethyl-β,β-dimethylglutaratKondensation von Benzaldehyd und p-Anisaldehyd mit Diethyl-β,β-dimethylglutarat in Gegenwart von Natriumhydrid ergibt die kristallinen (Z)-Halbester (1a und b) und ölige Halbesterfraktionen, die die E-Isomeren 2a und b enthalten.Im Falle von p-Chlorbenzaldehyd werden die (Z)- und (E)-Halbester (1c und 2c) in reiner kristalliner Form erhalten. Die Konfiguration wurde durch Cyclisierung der entsprechenden Anhydride 3 zu den Oxoindenylcarbonsäuren 5 bestimmt.
    Additional Material: 4 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prac.19823240305
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  • 7
    Electronic Resource
    Electronic Resource
    Steric Effects in the STOBBE Condensation of 3,4-Disubstituted Acetophenones with Dimethyl Methylsuccinate (1979)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 321 (1979), S. 65-70 
    Details
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Sterische Effekte in der STOBBE-Kondensation von 3,4-disubstituierten Acetophenonen mit Dimethyl-methylsuccinatDie Kondensation von 3,4-Dimethyl-, 3,4-Dimethoxy- und 3,4-Dichloracetophenon mit Dimethylsuccinat in Gegenwart von Kalium-t-butylat lieferte in jedem Fall ölige Gemische der stereoisomeren Halbester 1 und 2. Während die (E)-Halbester 1 zu den entsprechenden 1-Acetoxy-3-nahpthoesäureestern 5 cyclisiert werden konnten, ergaben die (Z)-Halbester 2 unter den gleichen Bedingungen die entsprechenden 3-Oxo-inden-2-(α-subst.)-essigsäuren 7.Das Isomerenverhältnis wird mit sterischen Wechselwirkungen in den γ-Lacton-Zwischenprodukten 8 erklärt.
    Additional Material: 4 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prac.19793210108
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  • 8
    Electronic Resource
    Electronic Resource
    Condensation of Aryl Benzyl Ketones with Dimethyl Diglycollate (1980)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 322 (1980), S. 42-48 
    Details
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Kondensation von Arylbenzylketonen mit DimethyldiglycollatPhenyl-, p-Tolyl- und p-Chlorphenyl-benzylketone kondensieren mit Dimethyldiglycollat in Gegenwart von Natriumhydrid in guten Ausbeuten zu den entsprechenden Z-Halbestern 2a-e. Struktur und Konfiguration der Halbester wurde durch chemische und spektroskopische Befunde gestützt.
    Additional Material: 4 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prac.19803220107
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  • 9
    Electronic Resource
    Electronic Resource
    Condensation of p-Substituted Benzophenones with Dimethyl Homophthalate (1975)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 317 (1975), S. 881-889 
    Details
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: p-Methyl-, p-methoxy-, and p-chlorobenzophenone condense with dimethyl homophthalate in the presence of sodium hydride to give the expected stereoisomeric half-esters 1 and 2. The (z)-configuration 2 was favoured in the two former ketones, whereas the (E)-configuration 1 prevailed in the latter. Configuration was determined by cyclisation of the derived dibasic acids 3 and 4 to the oxo-indenyl acids 7 and 8, also obtained by the action of aluminium chloride on the anhydrides 5 and 6. Cyclisation of the half-esters gave the indenyl esters 9 and 10. Structures are supported by i.r., u. v., and n. m. r. spectroscopic evidence. The ratio of isomers is interpreted in terms of the relative ease of ring cleavage of the intermediate δ-lactones 11 and 12.
    Additional Material: 5 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prac.19753170602
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  • 10
    Electronic Resource
    Electronic Resource
    Stobbe Condensation of Aromatic Aldehydes with Diethyl Diglycollate (1979)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 321 (1979), S. 741-746 
    Details
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Stobbe-Kondensation von aromatischen Aldehyden mit DiethyldiglycollatPiperonal, p-Tolylaldehyd und p-Chlorbenzaldehyd kondensieren mit Diethyldiglycollat in Gegenwart von Natriumhydrid zu den entsprechenden Z-Halbestern 1 und den Diarylidendicarbonsäuren 2 und 3. Strukturen und Konfigurationen der Produkte wurden durch chemische und spektroskopische Methoden untersucht.
    Notes: Piperonal, p-tolualdehyde, and p-chlorobenzaldehyde condense with diethyl diglycollate in the presence of sodium hydride to give predominantly the corresponding (Z)-half-esters 1. together with smaller yields of the diarylidene diacids 2 and 3. The structure and configuration of the products was established by chemical and spectroscopic evidence.
    Additional Material: 2 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prac.19793210505
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