Calix[6]pyrrole and Hybrid Calix[n]furan[m]pyrroles (n+m=6): Syntheses and Host–Guest Chemistry

Abstract

Out of line? Theory predicts that [Ti(N3)4] should exhibit unprecedented linear TiNNN bond angles as a consequence of the α‐N atoms of the azide groups acting as tridentate donors into the empty tetrahedral d0 orbitals of a (+IV) Group 4 metal atom. The title compounds were prepared and characterized (see structure). They do not possess linear TiNNN angles because their coordination numbers exceed four.

Heterocalixarenes and Calixnaphthalenes

“…Within this work other mixed heteroaromatic systems apart from the calixpyrrole were synthesised. 54 Binding studies have also been made on these four hexamers, with calix [3]furan [3]pyrrole basically not showing any binding of anions at all, although the other compounds did bind to anions, with binding strength being found to increase with the number of pyrrole units within the macrocycle. 54 Binding studies have also been made on these four hexamers, with calix [3]furan [3]pyrrole basically not showing any binding of anions at all, although the other compounds did bind to anions, with binding strength being found to increase with the number of pyrrole units within the macrocycle.…”

Computational Study on the Conformational Characteristics of Calix[4]pyrrole Derivatives

“…Calix [4]pyrrole (1), porphyrinogen-like macrocycle, has been drawn much attention due to its significant anion recognition properties. [3][4][5][6][7][8][9][10][11][12][13][14][15][16] Although the first synthesis of 1 was initially reported in 1886, 3 the guest binding properties had not been extensively investigated until late 1990's. 4,5 Calix [4]pyrrole adopts four major conformations as in the case of calix [4]arene.…”

Furan Oxidations in Organic Synthesis: Recent Advances and Applications

“…Thus, [74]. The same authors have described the synthesis of mixed calix[n]furan[m]pyrroles (n+m = 6) 66 further used for host-guest chemistry [76]. The same authors have described the synthesis of mixed calix[n]furan[m]pyrroles (n+m = 6) 66 further used for host-guest chemistry [76].…”