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  • 1
    Electronic Resource
    Electronic Resource
    Amsterdam : Elsevier
    International Journal of Radiation Applications & Instrumentation. Part C, 28 (1986), S. 549-553 
    ISSN: 1359-0197
    Keywords: Irradiation ; baking quality ; cobalt-60 ; economic evaluation ; electron accelerator ; pest control ; sensoric tests ; wheat flour
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Chemistry and Pharmacology , Energy, Environment Protection, Nuclear Power Engineering , Physics
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Journal of thermal analysis and calorimetry 36 (1990), S. 2505-2510 
    ISSN: 1572-8943
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Man fand, daß der erste Schritt der thermischen Zersetzung des Pyridiniumsalzes von 1,3-Bis(trimethylsilyl)-2,4-dimercapto-2,4-dithioxo-1,3-diaza-2λ5,4λ5-diphosphetidin (I) sehr wahrscheinlich einen Abbau zur Säureform HS(S)P(NHSiMe3)2P(S)SH (II) beinhaltet. Letztere ist sehr unbeständig und zersetzt sich, wobei als Endprodukt ein (PNS)x-Polymer entsteht. In vorliegendem Manuskript wird der Mechanismus dieses Prozesses näher untersucht.
    Notes: Abstract It was found that the first step of thermal decomposition of the pyridinium salt of 1,3-bis(trimethylsilyl)-2, 4-dimercapto-2,4-dithioxo-1,3-diaza-2λ5,4λ5-diphosphetidine (I) most probably involves breakdown to the acid form HS(S)P(NHSiMe3)2P(S)SH (II). The latter is very unstable and decomposes further, the end-product being a polymer (PNS)x. In this work, the mechanism of this process is investigated.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Journal of radioanalytical and nuclear chemistry 86 (1984), S. 11-17 
    ISSN: 1588-2780
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract A new extraction reagent-dibutylester of N-/4-antipyryl/-amidophosphoric acid/DBAAP/—has been developed and used for the extraction of divalent mercury into chloroform from mixture of sodium iodide and perchloric acid. It was found that the composition of the species extracted into the organic phase depends on the acidity of the aqueous phase. The solvate HgI2. DBAAP is extracted at low HClO4 concentrations, an ion-pair, /DBAAPH/+.HgI 3 − , is formed and extracted at high concentrations of perchloric acid.
    Type of Medium: Electronic Resource
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  • 4
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Synthesis, Properties and N.M.R. Spectroscopic Studies of 2,4-Dithioxo-2,4-dimercapto-1,3-diaza-2λ5,4λ5-diphosphetidinesOn the reaction of py · PS2Cl (1) or py · PS2F (2) (py = Pyridine) with hexamethyl disilazane in a molar ratio of 1:1 the pyridinium salt of the 1,3-bis(trimethylsilyl)-2,4-dimercapto-2,4-dithioxo-1,3-diaza-2λ5, 4λ5-diphosphetidine (3) is formed. 3 reacts with MeI to the corresponding methyl ester 9. There exist two isomers of 9, probable with cis and trans configuration of the MeS groups, respectively. 3 and 9 have been characterized by i.r., Raman, mass, and NMR spectroscopy. 4 reacts in acetonitrilic solution in the presence of water under hydrolytic cleavage of the trimethyl silyl groups whereas the P2N2 ring is preserved. The hydrolysis of 9 has been studied by 1H-, 31P-, and 13C-NMR spectroscopy.
    Notes: Bei der Reaktion der Dithiophosphorsäurebetaine Py · PS2Cl (1) und Py · PS2F (2) (Py = Pyridin) mit Hexamethyldisilazan im Molverhältnis 1:1 entsteht das Pyridiniumsalz des 1,3-Bis(trimethylsilyl)-2,4-dimercapto-2,4-dithioxo-1,3-diaza-2λ5, 4λ5-diphosphetidins (3), das mit Methyliodid zum entsprechenden Dimethylester (9) reagiert. 9 bildet zwei Isomere, die sich wahrscheinlich durch cis- und trans-Anordnung der MeS-Gruppen unterscheiden. 3 und 9 wurden IR-, Raman-, massen- und NMR-spektroskopisch charakterisiert. 4 reagiert in Acetonitril-Lösung in Gegenwart von Wasser unter hydrolytischer Abspaltung der Trimethylsilylgruppen und Erhalt des P2N2-Ringes. Der Verlauf der Hydrolyse wurde mittels 1H-, 31P- und 13C-NMR-Spektroskopie untersucht.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
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  • 5
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Synthesis, Properties, and N.M.R. Investigation of Phenylphosphonothioic Acid Bis-(trimethylsilylamide) and 1,3-Bis(trimethylsilyl)-2,4-diphenyl-2,4-dithioxo-1,3,2λ5,4λ5-diazadiphosphetidineThe reaction of phenylphosphonothioic dichloride PhP(S)Cl2 (1) with hexamethyl-disilazane (HMDSA) yields N,N′-bis(trimethylsilylamide) of phenylphosphonothioic acid PhP(S)(NHSiMe3)2 (2). The thermolysis of 2 leads to the 1,3-bis(trimethylsilyl)-2,4-diphenyl-2,4-dithioxo-1,3,2λ5, 4λ5-diazadiphosphetidine [PhP(S)NSiMe3]2 (3). The structures of the compounds 2 and trans-3 isolated in high purity habe been elucidated by means of mass, IR-, Raman-, and NMR (1H, 31P, 13C, 29Si) spectra. The first hydrolysis products of both compounds have been proved by NMR spectroscopy. Besides the predominantly formed trans-isomer of 3 the corresponding cis-isomer is obtained with 10% yield.
    Notes: Durch Umsetzung von Phenylthiophosphonsäuredichlorid PhP(S)Cl2 (1) mit Hexamethyldisilazan (HMDSA) wurde das Bis(trimethylsilylamid) dieser Säure PhP(S)(NHSiMe3)2 (2) hergestellt und durch thermische Zersetzung von 2 das 1,3-Bis(trimethyl-silyl)-2,4-diphenyl-2,4-dithioxo-1,3,2λ5,4λ5-diazadiphosphetid [PhP(S)NSiMe3]2 (3) erhalten. Mit Hilfe von Massen-, IR-, Raman- und NMR (1H, 31P, 13C, 29Si)-Spektren wurde die Struktur der in hoher Reinheit isolierten Verbindungen 2 und trans-3 aufgeklärt. NMR-spektroskopisch konnten die ersten Hydrolysestufen beider Verbindungen nachgewiesen werden. Neben dem vorwiegend entstehenden trans-Isomer von 3 wird zu etwa 10% das cis-Isomer gebildet.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
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