Inherently Chiral Calixcrowns Derived from p-tert-Butyldihomooxacalix[4]arene

Metal ion induced FRET On–Off in naphthyl-pyrenyl pendent tetrahomodioxacalix[4]arene

“…8 There have only been limited studies on the solution conformations, solid-state structures, and on complexation behavior of homooxacalix[4]arenes. 9- 12 We also previously reported that there are five conformations in tetrahomodioxacalix[4]arene with appropriate nomenclature (cone, partial cone, C-1,2-alternate, COC-1,2 alternate, and 1,3-alternate) as represented in Figure 1. 13 Recently, we also reported a solid-state structure of C- Pb 2+ proven by X-ray structure.…”

Theoretical Study on the Conformations of Homooxacalix[4]arenes

“…1 Homooxacalixarene, where -OCH2-groups are incorporated into the calixarene macrocycle, are useful platform for the design of molecular containers with different cavity size and conformational flexibility. [2][3][4][5][6][7] Tetrahomodioxacalix [4]arene (1-3 in scheme 1), containing two extra oxygen atoms in the macrocyclic ring, can provide larger cavity, greater flexibility, and extra coordination sites for guest complexation compared to calix [4]arene. [8][9][10] However, due to the synthetic difficulties, only limited studies have been reported on the syntheses, conformational analyses, and complexation of tetrahomodioxacalix [4]arenes.…”

Conformations of Tetrahomodioxa-p0phenylcalix[4]arene Alkyl Ethers

“…Calixarenes are synthetic macrocycles with varying ring sizes that have received a great deal of attention in recent years.1-3 They are of interest both as complexation hosts for ions and molecules and as frameworks for elaborating more complex structures. In contrast to calix [4]arenes, tetrahomodioxacalix [4]arenes which contain two extra oxygen atoms in the macrocyclic ring have received little attention, mainly because they can be synthesized only in relatively low overall yields.4-6 There have only been limited studies of the solution conformations, solid-state structures and complexation properties of tetrahomodioxacalix [4]arenes.7- 10 Shaping of cavity plays a potentially vital role in the de sign of calixarenes, for host-guest interaction depends on complementarity in shape as well as functionality. The inter conversion between conformers of calix [4]arene can be steri-cally inhibited by。-substituents bulkier than ethyl group.11 By using n-propyl bromide as an alkylation reagent, one can thus synthesize a variety of conformational isomer from calix [4]arene.…”