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  • 1
    ISSN: 0044-2313
    Keywords: Organylphosphine monosulfides ; organylphosphine monoselenides ; (1-hydroxyalkyl)-organyl-phosphine sulfides ; (1-hydroxyalkyl)-organyl-phosphine selenides ; bis(1-hydroxy-alkyl)-organyl-phosphine sulfides ; (1-hydroxy-1-methyl-ethyl)-phenyl-phosphine sulfide ; crystal structure ; hydrogen bonds ; 31P CP/MAS NMR ; quantumchemical calculation ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Investigation into Sulfides and Selenides of Primary Phosphines  -  The (1-Hydroxyalkyl)-organyl-phosphine Sulfides and Selenides, New Classes of CompoundsPrimary phosphines react with S8 and Se8, respectively, forming organylphosphine monosulfides, and monoselenides, respectively, RP(X)H2 (X = S, Se) which are well characterized by 31P NMR spectroscopy. Organylphosphine monosulfides are detected in the reaction mixture of primary phosphines with 2,4-diaryl-1,3,2,4-dithiadiphosphetane-2,4-disulfides, too. The reaction of primary phosphines with sulfur or selenium proceeds in presence of most of the ketones without formation of any side product. The (1-hydroxyalkyl)-organyl-phosphine sulfides and selenides, respectively, RP(X)(H)C(OH)R1R2, are yielded generally in crystalline form. The X-ray crystal structure analysis of the (1-hydroxy-1-methyl-ethyl)-phenyl-phosphane sulfide (R = Ph, R1 = R2 = Me) has shown that in the crystal the molecules are chained via intermolecular O—H … S hydrogen bridging bonds (O … S = 328 pm). Aldehydes react with primary phosphines and sulfur forming bis(1-hydroxyalkyl)-phenyl-phosphine sulfides, RP(S)[CH(OH)R1]2. 1H, 13C, and 31P NMR spectroscopic investigations allow to detect and to identify stereoisomers in some cases. Quantumchemical calculations reflect correctly which of the carbonyl compounds are able to react with the organylphosphine monosulfide formed as intermediate.
    Notes: Primäre Phosphane reagieren mit S8 oder Se8 und bilden neben einer großen Anzahl von Nebenprodukten Organylphosphanmonosulfide bzw. -selenide, RP(X)H2 (X = S, Se), die 31P-NMR- spektroskopisch charakterisiert werden können. Die Bildung von Organylphosphanmonosulfiden ist auch bei der Umsetzung primärer Phosphane mit 2,4-Diaryl-1,3,2,4-dithiadiphosphetan-2,4-disulfid nachweisbar. Praktisch ohne Nebenprodukte verläuft die Reaktion primärer Phosphane mit Schwefel oder Selen und einer Reihe von Ketonen. Es entstehen die meist kristallinen (1-Hydroxyalkyl)-organyl-phosphansulfide bzw. -selenide, RP(X)(H)C(OH)R1R2. Die Röntgen-Kristallstrukturanalyse des (1-Hydroxy-1-methyl-ethyl)-phenyl-phosphansulfids (R = Ph, R1 = R2 = Me) ergab, daß im Kristall intermolekulare O—H … S-Wasserstoffbrückenbindungen (O … S = 328 pm) zu einer kettenförmigen Anordnung der Moleküle führen. Aldehyde reagieren mit Phenylphosphan und Schwefel zu Bis(1-hydroxyalkyl)-phenyl-phosphansulfiden, C6H5P(S)[CH(OH)R1]2. 1H—, 13C— und 31P-NMR-Untersuchungen gestatten den Nachweis und die Zuordnung von auftretenden Stereoisomeren. Quantenchemische Berechnungen spiegeln richtig wider, welche Carbonylverbindungen in der Lage sind, mit dem intermediär gebildeten Phosphansulfid zu reagieren und welche nicht.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 0749-1581
    Keywords: AA'X spin system ; P—C shift correlation ; Strong coupling effectsin 2D NMR ; P—P and P—C coupling constants ; Relative signs ; Diphosphonates ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The indirect determination of P—P coupling constants and their relative signs in some symmetrical diphosphonates by 31P—13C 2D NMR is introduced. Advantages and disadvantages of this method and others for the determination of the coupling constants of chemically equivalent nuclei are discussed. Strong coupling effects are analysed by means of simulated 2D spectra and the product operator formalism.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
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