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  • Organic Chemistry  (19)
  • Wiley-Blackwell  (19)
  • American Institute of Physics (AIP)
  • 1990-1994
  • 1980-1984
  • 1955-1959  (19)
  • 1959  (19)
Collection
Keywords
Publisher
  • Wiley-Blackwell  (19)
  • American Institute of Physics (AIP)
Years
  • 1990-1994
  • 1980-1984
  • 1955-1959  (19)
Year
  • 1
    Electronic Resource
    Electronic Resource
    Reactions of Ortho-esters of Titanium. II. Reactions of Benzoic Acid and Ethyl and Isopropyl Titanate (1959)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 8 (1959), S. 235-240 
    Details
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The stepwise reaction between titanium alkoxides and benzoic acid has been investigated in detail. It has been shown that replacement of first two alkoxy groups of titanium alkoxide (Ti(OR)4; OR=OPri, or OEt) proceeds smoothly and the corresponding mono and di-benzoate derivatives, (C6H5COO)Ti(OR)3 and (C6H5COO)2Ti(OR)2, are formed quantitatively. The substitution of third alkoxy group proceeds slowly and the tri-benzoate derivative, (C6H5COO)3Ti(OR), is less stable decomposing into titanyl benzoate, (C6H5COO)2Ti=O, and corresponding ester, C6H5COOR. The course of reaction appears to be unaffected even in presence of excess benzoic acid (more than 4 moles). The reactions have been carried out in benzene medium and have been followed by estimating the alcohol removed in the azeotrope, analysis of products of reaction and isolation of esters produced as a result of decomposition of the tri-benzoate derivatives.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prac.19590080314
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  • 2
    Electronic Resource
    Electronic Resource
    Reactions of Titanium Tetra-chloride and Benzoic Acid (1959)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 8 (1959), S. 64-67 
    Details
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Beim Studium der stufenweisen Reaktion zwischen Titantetrachlorid und Benzoesäure wurde festgestellt, daß die Bildung von Benzoyltitantrichlorid oder Dibenzoyltitandichlorid schnell erfolgt. Titanylbenzoat wird bei der Reaktion zwischen Titantetrachlorid und Benzoesäure in Benzol in Gegenwart von wasserfreiem Ammoniak gebildet. Die Ergebnisse deuten auf ähnliche Reaktionen zwischen Titantetrachlorid und Benzoesäure bzw. Essigsäure hin.
    Notes: The stepwise reaction between titanium tetra-chloride and benzoic acid has been investigated in detail. The formation of C6H5COOTiCl3 and (C6H5COO)2TiCl2 is direct and rapid. Further replacement of chlorine by benzoate radical makes the resulting molecule unstable and no tetra-benzoate is formed. A plausible mechanism has been suggested for the decomposition of mono-chloride derivative under different conditions. Titanyl benzoate has been obtained by treating a mixture of titanium tetra-chloride and excess benzoic acid in benzene with anhydrous ammonia. The results indicate that the reactions of titanium tetra-chloride with benzoic acid are similar to those with acetic acid, this finding is in sharp contrast to the different behaviour of titanium tetra-chloride towards alcohols and phenols.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prac.19590080108
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  • 3
    Electronic Resource
    Electronic Resource
    Synthèse de pyrimidines. Etude de la condensation de l'éthoxycarbonyl-dithioacétate de méthyle avec les amidines (1959)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 42 (1959), S. 1317-1323 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: 2-Amino-4-hydroxy-6-mercaptopyrimidine (II) has been synthesized by condensation of guanidine with methyl ethoxycarbonyl-dithioacetate (I). The structure of the condensation product II has been proved (a) by desulfurization to isocytosine (III), (b) by comparison with a specimen prepared by treatment of 2-amino-4-chloro-6-hydroxypyrimidine (IV) with NaSH.The dithioester I and formamidine did not react under the same experimental conditions. The expected product, 4-hydroxy-6-mercaptopyrimidine (VII), has been obtained from 4,6-dichloropyrimidine through the following steps :4-chloro-6-methoxypyrimidine (V) and 4-chloro-6-hydroxypyrimidine (VI). The dithioester I is considerably less reactive than ethyl malonate in the reaction with the two amidines studied.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/hlca.19590420429
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  • 4
    Electronic Resource
    Electronic Resource
    Détermination pH-métrique des constantes acide-base par la fonction de formation. IIe partie (1959)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 42 (1959), S. 1725-1729 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: A new method for the calculation of the acid-base constants based on the pH- metry has been proposed in a previous paper. The formulas given apply particularly well in cases where the constants differ little from each other. The results obtained are satisfactory only if the concentrations of the compounds investigated are sufficiently high and the acid-base constants neither too small (less than -9) nor too high (higher than 10-3) The initial formulas have therefore been modified in order to apply to all cases. The four constants of ethyleneglycol-bis-(β-aminoethyl ether)-N, N′-tetraacetic acid are calculated using the approximative and the generalized formulas. On the other hand the constants of β,β′-diaminodiethylether-N, N′-tetra-acetic and diglycolic acids are calculated with the help of the generalized formulas.
    Additional Material: 3 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/hlca.19590420536
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  • 5
    Electronic Resource
    Electronic Resource
    Macro- et microdosage de traces de cobalt III. Dosage par spectrophotométrie au moyen du nitroso-sel R. (nitroso-1-naphtol-2-disulfonate-3,6 de sodium) (1959)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 42 (1959), S. 2334-2342 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Une étude complète a été faite concernant le dosage de traces de cobalt (jusqu'au nanogramme) par spectrophotométrie au moyen du nitroso-sel R (nitroso-1-naphtol-2-disulfonate-3,6 de sodium) dans des macro- et des microcuves. Les erreurs ont été déterminées et deux nouvelles microcuves sont décrites. Le procédé proposé permet de doser 3·10-9 g de cobalt dans un volume de 0,3 ml.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/hlca.19590420705
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  • 6
    Electronic Resource
    Electronic Resource
    Reaktionen mit Mikroorganismen. 10. Mitteilung. Die Reduktion von (±)-9-Methyl-trans-dekalindion-(1,6) mit Curvularia falcata (1959)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 42 (1959), S. 1862-1870 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Curvularia falcata (TEHON) BOEDIJN reduziert das (9S)-9-Methyl-trans-dekalindion-(l,6) (IV) rasch, sowohl in Stellung 1 als auch in Stellung 6, unter Bildung von Hydroxyketonen V und VI (und Enantiomeres von VI) und von Diol VII. Das (9R)-Enantiomere des Eduktes wird langsamer angegriffen, wobei hauptsächlich das Hydroxyketon IX (und Enantiomeres von IX) und das Diol X entstehen.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/hlca.19590420615
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  • 7
    Electronic Resource
    Electronic Resource
    Alkaloide aus Conopharyngia durissima STAPF Isovoacangin, Conopharyngin, Conodurin und Conoduramin (1959)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 42 (1959), S. 1572-1581 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: One known and four new alkaloids have been isolated from C. durissima STAPF. Isovoacangine (VII) (first isolated from Stemmadenia), conopharyngine (VIII), and possibly also Alkaloid E are monomeric isoquinuclidine bases found in root and stem bark; conodurine and conoduramine, however, are dimeric and found only in the roots. A mild and simple method is described for the decarbomethoxylation of ester bases of the voacangine type to substances of the ibogaine type.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/hlca.19590420519
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  • 8
    Electronic Resource
    Electronic Resource
    Macro- et microdosage de traces de cobalt. I. Etude analytique du cobalt au polarographe à rayons cathodiques (1959)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 42 (1959), S. 1672-1678 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: I1 a été fait une étude systématique du dosage du cobalt au polarographe à rayons cathodiques. Avec cet appareil, il est possible de doser le cobalt à une concentration de 0, l μg/ml dans un volume de 0, l ml (soit 0,0lμg de cobalt). Une étude statistique de l'erreur a été effectuée. L'oxygène gêne, car en présence de cobalt et de chlorure, il donne un saut inattendu à -1,4 volt, et simultanément les autor dinaire du cobalt disparaît. Le zinc qui se trouve en quantité appréciable dans les acides nitrique et perchlorique donne, lorsqu'il a été traité par ceux-ci, un saut qui se superpose à celui du cobalt. On peut ramener le saut du zinc au potentiel E½ normal en traitant le résidu par l'acide chlorhydrique. La dithizone doit être entièrement détruite, sinon elle donne des sauts au polarographe dont le E½ est très voisin de celui du cobalt. Une méthode de destruction de ce reactif est donnée.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/hlca.19590420528
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  • 9
    Electronic Resource
    Electronic Resource
    Zur Kenntnis der Sesquiterpene und Azulene. 127. Mitteilung. Über die Inhaltsstoffe der Asa foetida II. Farnesiferol B und C (1959)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 42 (1959), S. 2557-2570 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Structures III and XXV have been derived on the basis of degradative work and physical evidence for Farnesiferol B and C, two isomeric C24H30O4 compounds previously isolated from Asa foetida (Umbelliferae).
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/hlca.19590420727
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  • 10
    Electronic Resource
    Electronic Resource
    Über die Kohlenoxyd-Hydrierung an Rutheniumkatalysatoren 3. Mitteilung. Kohlenoxyd-Hydrierung zwischen 100 und 2000 atVortrag an der Sommerversammlung der Schweiz. Chem. Gesellschaft in Glarus am 13./14. September 1958 (gekürzte Fassung). (1959)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 42 (1959), S. 481-484 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Während durch die Veröffentlichungen von PICHLER Pr RUFFLEB bekannt war, dass eine Erhöhung des Druckes und der damit verbundenen Verlängerung der Verweilzeit bei der Hydrierung von Kohlenoxyd nach FISCHER-TROPSCH eine Steigerung des Gasumsatzes und des Festparaffin-Anteiles zur Folge hat, wurde erstmals der spezifische Einfluss des Druckes allein auf Umsatz und Selektivität, unabhängig bzw. unter Konstanthaltung der Kontaktzeit, im Druckbereich von 100-2000at untersucht. Eine vollautomatische Kleinanlage diente fur die meist ca. 100 Std. dauernden Versuche.Es konnte hierbei nachgewiesen werden, dass mit zunehmendem Druck auch bei Konstanthaltung der Verweilzeit der Umsatz praktisch linear zunimmt. Die Selektivität, d. h. die prozentuale Produktenverteilung, ist hingegen im Gebiet von 200 bis 2000 at vom Druck praktisch unabhängig. Die Anwendung von hohen Drucken gestattet jedoch ein Arbeiten bei tieferen Temperaturen mit guten Umsätzen und ermöglicht damit eine Verschiebung der Selektivität in Richtung auf Festparaffine.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/hlca.19590420213
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