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Borman, Christopher J.,Custelcean, Radu,Hay, Ben P.,Bill, Nathan L.,Sessler, Jonathan L.,Moyer, Bruce A. Royal Society of Chemistry 2011 Chemical communications Vol.47 No.27
<P><I>meso</I>-Octamethylcalix[4]pyrrole (C4P) enhances sulfate selectivity in solvent extraction by Aliquat® 336N, an effect ascribed to the supramolecular preorganization and thermodynamic stability imparted by insertion of the methyl group of the Aliquat cation into the cup of C4P in its cone conformation.</P> <P>Graphic Abstract</P><P>Enhanced selectivity for sulfate extraction is observed when <I>meso</I>-octamethylcalix[4]pyrrole and a methyl-bearing quaternary ammonium anion exchanger are used in concert. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c1cc12060c'> </P>