Liquid-liquid extraction of cinchona alkaloids by using some metal complexes of optically pure usnic acids

  • Tsurubou S
  • Sakai T
  • Kihara S
 et al. 
  • 5

    Readers

    Mendeley users who have this article in their library.
  • 4

    Citations

    Citations of this article.

Abstract

Liquid-liquid extraction of cinchona alkaloids by using some metal complexes of zinc(II), cobalt(II) and copper(II) with (+)- and (-)-usnic acids was studied. The synergic effect of the chelates was studied by adduct formation with neutral Lewis bases such as tri-n-octylphosphine oxide and optically active isomers of cinchona alkaloids. It was possible to differentiate between the adduct formation of quinine and that of quinidine, and also of cinchonine and of cinchonidine, in the synergic extraction of zinc(II) and cobalt(II) with (+)- and (-)-usnic acids. © 1991.

Author-supplied keywords

  • Cinchona alkaloids
  • Extraction

Get free article suggestions today

Mendeley saves you time finding and organizing research

Sign up here
Already have an account ?Sign in

Find this document

Authors

  • Shigekazu Tsurubou

  • Tadao Sakai

  • Sorin Kihara

  • Masakazu Matsui

Cite this document

Choose a citation style from the tabs below

Save time finding and organizing research with Mendeley

Sign up for free