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Complex-forming and selectivity properties of substituted tetraphenylethylenediphosphine dioxides with respect to alkali metal cations
Authors:V. I. Evreinov  A. É. Antoshin  Z. V. Safronova  A. V. Kharitonov  E. N. Tsvetkov
Affiliation:(1) Institute of Physiologically Active Substances, Academy of Sciences of the USSR, Chernogolovka
Abstract:The complex-forming reactivity of mono- and disubstituted ethylenediphosphine dioxides of the general formula Ph2P(O)CH2C(R1R2)P(O)Ph2, and of a tetraphosphorylated monopodand, ortho-bis[4,5-bis(diphenylphosphinyl)-pentoxy]benzene, relative to alkali metal cations have been determined conductometrically in THF-CHCl3 medium (4:1). Introduction of alkyl substituants in the ethylene bridge of tetraphenylethylenediphosphine dioxide increases its Li/Na selectivity; maximum Li/Na selectivity equal to 40 is observed for the dimethyl-substituted tetraphenylethylenediphosphine dioxide derivative. Among the ligands examined herein the hexadentate tetraphosphoryl-containing monopodand ortho-bis[4,5-bis(diphenylphosphinyl)pentoxy]benzene was found to be the most effective complex-forming agent with respect to lithium (logbeta=6.0), with a high Li/Na selectivity value equal to 40. The syntheses of 1,1-dimethyltetraphenylethylenediphosphine dioxide and of ortho-bis[4,5-bis(diphenylphosphinyl)pentoxy]benzene are described.Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No. 4, pp. 873–877, April, 1990.The authors wish to thank Z. N. Vostroknutovii for carrying out the stability constant measurements in anhydrous acetonitrile.
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