Akkus, G.U., Memon, S., Sezgin, M. and Yilmaz, M. (2009) Synthesis of calix (aza) Crown and Its Oligomeric Analogue for the Extraction of Selected Metal Cations and Dichromate Anions. CLEAN—Soil, Air, Water, 37, 109-114.
https://doi.org/10.1002/clen.200800120

has been cited by the following article:

• TITLE: Synthesis and Extraction Studies of Calix[4]-Crown-4 Oxime Derivatives

  AUTHORS: Gülderen Uysal Akkuş, Selma Aslan

  KEYWORDS: Calix[4]Arene, Calixcrown, Calix-Oxime, Ion Exchange, Liquid-Liquid Extraction

  JOURNAL NAME: International Journal of Organic Chemistry, Vol.7 No.4, October 26, 2017

  ABSTRACT: The article comprises synthesis of calyx[4]-oxa-crown, and calix[4]-thia-crown compounds containing nitrile groups (3a, 3b) and amino groups (4a, 4b) and their corresponding oxime derivatives (5a, 5b) and liquid-liquid extraction studies of these compounds. The oxime derivatives of compounds (5a, 5b) have been synthesized by reacting of di-n-butylamino derivatives of calix[4]-oxa-crown, and calix[4]-thia-crown compounds (4a, 4b) with amphi-chloroglyoxime in methanol-THF. Their cation and anion transfer studies were performed by using liquid-liquid extraction procedure. It has been concluded from the observations that the compound 3a shows a good extraction behavior toward Na+ ion in the presence of other metal cations. Whereas, its oxime derivatives transfers all of the metal cations used in the liquid-liquid extraction studies.