Synthesis, structure and complexing properties of new calix[4](aza)crowns

Synthesis and Study of Calix[6]cryptamides: A New Class of Heteroditopic Receptors that Display Versatile Host–Guest Properties Toward Neutral Species and Organic Associated Ion‐Pair Salts

“…All these results show that the use of the peptide-coupling reaction for the [1+1] macrocyclization step can be extended to structurally different tripodal partners and gives access to original calixarene based compounds that are either closed at the narrow rim by a grid-like amido cap (4,(10)(11)(12) or possessing a calix [6]tube skeleton (13).…”

“…So far, only calix [6]arenes that have intramolecular dipodal amido bridges have been described. [10,11] Apart from the synthetic challenge, the Abstract: The synthesis of a new family of molecular receptors, namely the calix [6]cryptamides, was achieved through an original [1+1] macrocyclization step that consists of a peptidecoupling reaction between tripodal triscarboxylic acids and a calix [6]trisamine subunit. Several C 3 -or C 3v -symmetrical calix [6]arene-based compounds capped by a trisamido cryptand unit on the narrow rim have been obtained, with the more flexible partners leading to the best yields.…”

Aryleneethynylene Trimers Bearing Calix[4]arenes: Synthesis, Optical Properties and Self‐Assembling Studies

“…The triester derivative (3) was prepared from the parent calix [4]arene following a literature procedure. [14] The bis-calix[4]arene 4 was obtained in 80% yield by adapting our former protocol. [15] Following a Sonogashira-Hagihara methodology, compound 4 was then double cross-coupled with 2-and 3-ethynyl-9-propyl-9H-carbazole, [11] furnishing the CALIX-CO 2 MeCBZs 5 and 6 in 68% and 72% respectively.…”

Synthesis and crystal structures of novel calix[4]azacrowns

“…Queslati et al [13] also reported the synthesis of a series of t e rt-butyl-calix [4](aza)crowns and their complexing properties towards Co 2+ , Ni 2+ , and Cu 2+ ions. Abidi et al [14] reported the synthes Pis of t e rtbutylcalix [4](aza)crowns capped by one 'tren' or doubly capped by two azacrowns. Bitter et al [15] reported a synthetic strategy for a series of calix [4](aza)crowns having amide groups and their NMR properties and crystal structures.…”