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  • 1
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 330 (1964), S. 295-308 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: pK′ values of carbethoxyalkylphosphines, carbamidoalkylphosphines and carboxy-alkylphosphines of the general formula R2P—R′—COR″ (R″ = —OC2H5, —NH2, and —OH, respectively) are determined potentiometrically using water - ethanol or water as the solvent.The basicity of the P atom in these compounds depends on the kind of R (alkyl, cycloalkyl or aryl group) and R′ (linear or branched alkylene group) and is influenced by the position of the COOC2H5, CONH2 and COOH group, respectively.IR and NMR spectra of the carboxyalkylphosphines indicate no dipolar structure of these P-analogous amino acids.
    Notes: In Fortsetzung einer früheren Arbeit(2) werden durch potentiometrische Titration in Äthanol-Wasser bzw. Wasser die pK′-Werte der Carbäthoxyalkylphosphine R2P—R′—COOC2H5, der Carbamidoalklphosphine R2P—[CH2]n—CONH2 und der Carboxyalkylphosphine R2P—R′—COOH bestimmt.Die Basizität des P-Atoms dieser Verbindungen der allgemeinen Formel R2P—R′—COR″ wird durch die Art der Gruppen R und R′ beeinflußt (R = Alkyl-, Cycloalkyl- oder Arylgruppe; R′ = lineare oder verzweigte Alkylengruppe) und hängt von der Stellung der COR″-Gruppe ab.Aus IR- und NMR-Spektren folgt, daß die den Aminosäuren im Formeltyp entsprechenden Carboxyalkylphosphine weder in fester Form noch in THF-Lösung eine dipolare Struktur besitzen.
    Additional Material: 10 Ill.
    Type of Medium: Electronic Resource
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