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  • Chemistry  (2)
  • pest control  (1)
  • 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
    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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  • 3
    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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