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  • 1
    ISSN: 0044-8249
    Keywords: Heterocyclen ; Lithiumverbindungen ; Stickstoffverbindungen ; Tellurverbindungen ; Tris(tert-butylimido)-tellurit ; Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 621 (1995), S. 1813-1817 
    ISSN: 0044-2313
    Keywords: [AsPh4][Ph2P(S)NSiMe3] · 0.5 THF ; preparation ; crystal structure ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Darstellung und Röntgen-Strukturbestimmung von [AsPh4][Ph2P(S)NSiMe3] · 0,5 THFDie Reaktion von Ph2P(S)N(SiMe3)2 mit Kalium-tert-butoxid im molaren Verhältnis 1:1 ergibt K[Ph2P(S)NSiMe3], das mit [AsPh4]Cl zum AsPh4+-Salz umgesetzt wird. Die Kristallstruktur von [AsPh4][Ph2P(S)NSiMe3] ·0,5 THF besteht aus AsPh4+ und Ph2P(S)NSiMe3- mit d(P—S) = 1,980(4) Å und d(P—N) = 1,555(8) Å. Der P—N—Si-Winkel im Anion beträgt 136,3(5)°. Der elektrophile Angriff von Ph2P(S)Cl erfolgt am Schwefel des Ph2P(S)NSiMe3-. Die Oxidation des Anions mit Iod ergibt ein Disulfid, das bei Umsetzung mit Kalium-tert-butoxid wieder K[Ph2P(S)NSiMe2] ergibt.
    Notes: The reaction of Ph2P(S)N(SiMe3)2 with potassium tert-butoxide in a 1:1 molar ratio produces K[Ph2P(S)NSiMe3], which was converted to the AsPh4+ salt by metathesis with [AsPh4]Cl. The X-ray crystal structure of [AsPh4][Ph2P(S)NSiMe3] · 0.5 THF consists of noninteracting AsPh4+ and Ph2P(S)NSiMe3- ions with d(P—S) = 1.980(4) Å and d(P—N) = 1.555(8) Å. The PNSi bite angle in the anion is 136.3(5)°. Electrophilic attack by Ph2P(S)Cl occurs at the sulfur atom of Ph2P(S)NSiMe3-. The oxidation of the anion with iodine produces a disulfide which regenerates K[Ph2P(S)NSiMe2] upon treatment with potassium tert-butoxide.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 30 (1992), S. 177-182 
    ISSN: 0749-1581
    Keywords: 14N and 15N NMR ; Cyclic sulfur imides ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The 14N and 15N NMR spectra of natural abuadance and 15N-enriched samples of S7NH and S4(NH)4 were obtained by direct detection and by a variety of polarization transfer techniques. Sensitivity enhancements of ca 10 (compared with direct detection) for the INEPT pulse sequence and ca 100 for the HMQC (heteronuclear multiple quantum coherence) + BIRD (bilinear rotation decoupling) sequence were observed for the imides. 15N spin-lattice relaxation constants (T1) of 10.2 ± 0.1 and 12.6 ± 0.1 s were determined for S7NH and S4(NH)4, respectively. The HMQC procedure was used to obtain the 15N and 1H NMR chemical shifts and 11J(15N, 1H) values for 1,3-,1,4- and 1,5-S6(NH)2, 1,3,5- and 1,3,6-S5(NH)3. The trends in NMR chemical shifts and coupling constants are discussed in the context of the known molecular structurts of cyclic sulfur imides. The use of NMR techniques for the analysis of mixtures of cyclic sulfur imides is compared with the well established methods of infrared spectroscopy and thin-layer chromatography.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
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