Highly Selective Coextraction of H + /SO 4 2- Using a Strapped Calix[4]pyrrole.

Authors :: He YC
Tong HB
Xu CG
Ren ZX
Wang YZ
Yan YM
Wang ML
Source :: Organic letters [Org Lett] 2023 Mar 17; Vol. 25 (10), pp. 1737-1741. Date of Electronic Publication: 2023 Mar 06.
Publication Year :: 2023
Abstract: We report on the synthesis of a cage-type calix[4]pyrrole ( 1 ) bearing an additional basic pyridinebisthiazolamine group on the strap. The receptor in its protonated form shows strong affinity and selectivity for sulfate over a wide range of inorganic anions. With receptor 1 as a liquid-liquid extractant, H <superscript>+</superscript> /SO <subscript>4</subscript> <superscript>2-</superscript> in the form of H <subscript>2</subscript> SO <subscript>4</subscript> is almost quantitatively extracted from an aqueous solution containing HNO <subscript>3</subscript> at a high concentration to CH <subscript>2</subscript> Cl <subscript>2</subscript> in a recyclable manner.