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  • 1
    Publication Date: 1975-01-01
    Print ISSN: 0040-4039
    Electronic ISSN: 1873-3581
    Topics: Chemistry and Pharmacology
    Published by Elsevier
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  • 2
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1974 (1974), S. 671-689 
    ISSN: 0075-4617
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Vibrational Spectra and Dipole Moment Measurements Concerning the Configuration of Oxalates and ThiooxalatesOn account of IR-band splittings in the carbonyl region and a comparison of experimental and calculated dipole moments one may conclude that the ester groups in oxalates 1, thio-oxalic O,S-diesters 2, and (alky1thio)thiocarbonylformates 5 exhibit the Z- as well as the E- configuration. - Dithiooxalic S,S-diesters, on the other hand, show single CO bands and especially low dipole moments, evidencing preference of a centrosymmetric, probably Z,E,Z configuration in 3.
    Notes: Aus IR-Bandenaufspaltungen im Carbonylbereich sowie dem Vergleich zwischen gemessenen und aus Inkrementen berechneten Dipolmomenten wird geschlossen, daß bei Oxalsäurediestern 1, Thiooxalsäure-O,S-diestern 2 und (Alkylthio)thiocarbonylameisensäureestern 5 2- und E-konfigurierte Estergruppen nebeneinander vorliegen. - Bei den Dithiooxalsäure- S,S-diestern 3 findet man dagegen nur eine Carbonylbande im IR-Spektrum und ein besonders niedriges Dipolmoment, was für die Bevorzugung einer zentrosymmetrischen, wahrscheinlich der Z,E,Z-Konfiguration spricht.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 0075-4617
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Activated Thiocarboxylates, VI). - Synthesis and IR- and Raman Spectroscopic Studies on Hydroxythiocarboxylic Ο-EstersStarting from 2-hydroxybenzonitrile (1) and benzoyl cyanide (9), 2-hydroxythiobenzoic Ο-esters 3 and 2-hydroxy-2-(phenyl)thioacetic Ο-esters 14, respectively, are obtained by Pinner synthesis and subsequent reaction of the resulting imidoate hydrochlorides 2 and 10, respectively, with hydrogen sulfide. The occurrence of 0 -H … S=C-hydrogen bridges is deduced from the IR, Raman, and 1H-NMR spectra of 3, 14, and 0-methyl P-hydroxythiocinnamate (19) as well as the cc,P-unsaturated P-hydroxythioketones 15and 16. They are strong in the case of 3 and particularly in 15,16, and 19. The C=S-stretching frequency of the compounds studied can be located in the range of 1200-1300 cm-1 taking the Raman spectroscopic data into consideration.
    Notes: Ausgehend von 2-Hydroxybenzonitril (1) und Benzoylcyanid (9) werden durch Pinner-Synthese und Reaktion der gebildeten Imidsäureester-hydrochloride 2 bzw. 10 mit Schwefelwasserstoff 2-Hydroxythiobenzoesäure-&0gr;-ester 3 bzw. 2-Hydroxy-2-(phenyl)thioessigsäure-O-ester 14 dargestellt. Aus den IR-, Raman- und 1H-NMR-Spektren von 3, 14, P-Hydroxythio-zimtsäure-0-methylester (19) sowie der α,β-ungesättigten β-Hydroxythioketone 15 und 162 wird auf das Auftreten von O-H…S=C-Wasserstoffbrücken geschlossen, die bei 3 urid vor allem bei 15,16und 19besonders stark sind. Die Raman-Spektren erlauben die Lokalisierung der C=S-Valenzschwingung im Bereich von 1200- 1300 cm-1.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
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