title: Anion recognition by alpha-arylazo-N-confused calix[4]pyrroles.
abstract: The first example of substitution reaction in the free alpha-position of N-confused calix[4]pyrroles is reported: azo-coupling with various arenediazonium salts. The obtained azocompounds were used for studies of their anion-binding properties by UV-Vis spectroscopy.
authors.affiliation: Department of Chemistry, Katholieke Universiteit Leuven, Celestijnenlaan 200F, B-3001, Leuven, Belgium.
authors.forename: Rong
authors.initials: R
authors.lastname: Gu
authors.forename: Stefaan
authors.initials: S
authors.lastname: Depraetere
authors.forename: Jan
authors.initials: J
authors.lastname: Kotek
authors.forename: Jan
authors.initials: J
authors.lastname: Budka
authors.forename: Ewa
authors.initials: E
authors.lastname: Wagner-Wysiecka
authors.forename: Jan F
authors.initials: JF
authors.lastname: Biernat
authors.forename: Wim
authors.initials: W
authors.lastname: Dehaen