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  • Organic Chemistry  (1)
  • water hardness  (1)
  • 1985-1989  (2)
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  • 1
    ISSN: 1436-5073
    Keywords: magnesium selective electrode ; water hardness ; blood serum
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Magnesium selective ionophores are described which induce a rejection of Na+ and K+ in solvent polymeric membranes by factors of up to 6300 and 5000, respectively. Depending on the membrane composition, ion selective electrodes may be obtained with equal selectivity for Mg2+ and Ca2+ as well as sensors with a discrimination of Ca2+ by a factor up to 8. Sensors of the type described are candidates for water hardness determination as well as for an Mg2+ assay in blood by chemometric procedures.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 0170-2041
    Keywords: 1,2-Thiazetidine 1,1-dioxides, silylation of ; β-Sultams ; Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Properties and Reactions of Substituted 1,2-Thiazetidine 1,1-Dioxides: 2-and/or 4-Silylated 1,2-Thiazetidine 1,1-DioxidesDepending on the reaction conditions and the molar ratio of the reactants, all possible N- and/or C-4 silylated β-sultams 2-11; are prepared starting with 1,2-thiazetidine 1,1-dioxide (1), The 2,3-disubstituted β-sultams 16 and 19 are silylated at C-4. Disilylation is preferred. The X-ray analysis of 2d is reported. Stability and some spectroscopic properties are briefly discussed.
    Notes: Durch Silylierung unter verschiedenen Bedingungen und in Abhängigkeit von den molaren Verhältnissen der Reaktanden können aus 1,2-Thiazetidin-1,1-dioxid (β-Sultam, 1) alle denkbaren an N- und C-4 silylierten Produkte 2-11 erhalten werden. Die 2,3-disubstituierten β-Sultame 16 und 19 werden an C-4 silyliert, wobei Disilylierung bevorzugt ist. Von 2d wird die Struktur durch eine Röntgenstrukturuntersuchung bei -130°C geklärt. Die Stabilität und einige spektroskopische Eigenschaften werden diskutiert.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
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