Pentapyrrolic calix[4]pyrroleElectronic supplementary information (ESI) available: NMR titration plots; experimental section. See http://www.rsc.org/suppdata/cc/b3/b303959e/

Abstract
A new calix[4]pyrrole has been synthesised that contains a 3,4,5-trisbromopyrrole appended to a meso-position which shows enhanced anion affinity as compared to the parent meso-octamethylcalix[4]pyrrole macrocycle.

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