title: [1₄]Heterophane prototypes containing azolium and/or azole anion-binding motifs.
abstract: Revisiting a '3 + 1' convergent stepwise strategy permitted the synthesis of [1₄]imidazoliophane 2·2Br in excellent yield for a macrocyclization. The new [1₄]triazoliophane 3 and bis(1,2,3-triazolium) counterpart 4·2Cl were less synthetically accessible and the hybrid derivative 5·Cl proved troublesome to prepare. Triazolophane 3 was devoid of anion-binding affinities, while charged [1₄]heterophane prototypes showed a particular preference for acetate. When association constants were compared, dicationic systems 2·2PF6 and 4·2PF6 showed greater values than monocationic macrocycle 5·PF6, and the highest affinities corresponded to the bis(imidazolium) receptor 2·2PF6.
authors: Laboratori de Química Orgànica, Facultat de Farmàcia, Universitat de Barcelona, Avda. Joan XXIII s/n, 08028 Barcelona, Spain. neusmesquida@ub.edu
authors: Neus
authors: N
authors: Mesquida
authors: Immaculada
authors: I
authors: Dinarès
authors: Anna
authors: A
authors: Ibáñez
authors: Ermitas
authors: E
authors: Alcalde
mesh_terms: D000838:Anions; D001393:Azoles / Q000737:chemistry*; D047250:Calixarenes / Q000138:chemical synthesis* / Q000737:chemistry; D057930:Click Chemistry; D007093:Imidazoles / Q000737:chemistry*; D009682:Magnetic Resonance Spectroscopy; D008968:Molecular Conformation; D014230:Triazoles / Q000138:chemical synthesis* / Q000737:chemistry
chemical_list: D000838:Anions; D001393:Azoles; D007093:Imidazoles; D014230:Triazoles; D047250:Calixarenes