Calixarenes 12

Gutsche, C. David; Lin, Lee-Gin

doi:10.1016/s0040-4020(01)87580-3

Cited by 473 publications

(189 citation statements)

References 23 publications

Supporting

Mentioning

184

Contrasting

Unclassified

Order By: Relevance

“…The tert-butyl groups were then removed following an AlCl 3 catalyzed retro-FriedelϪCrafts reaction in the presence of phenol. [38] TLC analysis yielded R f ϭ 0.61 in CH 2 Cl 2 /petroleum ether (1:1, v/v), and R f ϭ 0.31 in acetone/ petroleum ether (1:9, v/v). It was further characterized by IR, 1 H, and 13 C NMR and EI mass spectrometry.…”

Section: Calix[6]mentioning

confidence: 99%

Tuning the Stoichiometry of Lanthanide Complexes with Calixarenes: Bimetallic Complexes with a Calix[6]arene Bearing Ether‐Amide Pendant Arms

et al. 2004

View full text Add to dashboard Cite

A de-tert-butylated calix [6]arene (A 6 L 6 ) fitted with six etheramide pendant arms was synthesized and characterized in solution. NMR spectroscopic data point to the six phenoxide units adopting an average D 6h conformation on the NMR time scale. According to MM3 molecular mechanics, and MOPAC quantum mechanical calculations, A 6 L 6 is a ditopic ligand featuring two nonadentate coordination sites, each built from three pendant arms, and extending in opposite directions with one above, and the other under the main ring. A 6 L 6 reacts with Ln III ions (Ln = La, Eu) in acetonitrile to successively form 1:1 and 2:1 complexes. The isolated Eu III 2:1 complex is luminescent (quantum yield: 2.5% in acetonitrile, upon ligand excitation). In the solid state, the luminescence decay is bi-exponential, with lifetimes equal to 1.66 and 0.46 ms (upon direct metal excitation), pointing to the presence of two differently coordinated metal ions, one with essentially

show abstract

Section: Calix[6]mentioning

confidence: 99%

Tuning the Stoichiometry of Lanthanide Complexes with Calixarenes: Bimetallic Complexes with a Calix[6]arene Bearing Ether‐Amide Pendant Arms

et al. 2004

View full text Add to dashboard Cite

show abstract

“…Receptors 1 were synthesized from optically pure (S)-1,1′-bi-2-naphthol via a set of straight-forward steps involving etherification in the presence of a base, tosylation with TsCl, a modified Williamson synthesis with calix [4]arene 15 in the presence of base, and condensation with 4-amino-m-cresol under alkaline conditions in the presence of K 3 [Fe(CN) 6 ]. Proton NMR analyses confirm that both 1a and 1b contained 1,1′-binaphthylas well as the bis(indophenol)-derived calix [4]crown unit.…”

Section: Synthesis and Structurementioning

confidence: 99%

Naked-Eye Detectable Chiral Recognition Using a Chromogenic Receptor

et al. 1998

View full text Add to dashboard Cite

This article is concerned with our recent achievement in developing synthetic chromogenic receptors for optical active amines and amino acid derivatives. Pre-organized (S)-1,1'-bi-2-naphthyl-and bis(indophenol)-derived calix[4]crown 1a shows naked-eye detectable chiral recognition between those enantiomers. The spectroscopic properties are reported, as well as an estimation of the enantioselectivity using an HPLC equipped with a chiral packing column.

show abstract

“…There is no shift in the mean or the maximum shiftlesd in the final cycles. A secondary extinction coefficient was refined to 0.0035 (5). Experimental detail and crystal data are summarized in …”

Section: 3-di-0-propargyicalix[4]arene 2bmentioning

confidence: 99%

Propargyl calix[4]arenes and their complexes with silver(I) and gold(I)

Xu¹,

Vittal²,

Puddephatt³

1996

Can. J. Chem.

View full text Add to dashboard Cite

A calix [4]arene 10 has been substituted at the lower rim by reaction with propargyl bromide to give either the 1,3-bis(propargy1) derivative 20, which is formed regioselectively, or the tetrakis(0-propargyl)calix [4]arene 3 under different reaction conditions. The molecular structure of 2b has been characterized by X-ray analysis (monoclinic, space group P2,lc, Z = 4, a = 10.960(1), b = 24.302(3), c = 10.673(1) A, P = 112.99(8)", R = 0.05 16). The molecules of 20 in the crystal are arranged in a "head-to-head, tail-to-tail" manner with aphenyl substituent of one molecule partly enclosed in the bowlic cavity of another. Since the two OCH,CECH groups are accessible, 2b can be polymerized by heating to 250°C and the polymerized propargyl calix[4]arene derivatives are stable up to 460°C. Compound 3 exists as a mixture of conformers, the ratio of partial cone to 1,3-alternate conformations being 4: 1 or 2: 1, dependent on the preparative conditions. These propargyl calix[4]arene derivatives can be further derivatized to form silver(1) or gold (1)

show abstract

Calixarenes 12

Cited by 473 publications

References 23 publications

Tuning the Stoichiometry of Lanthanide Complexes with Calixarenes: Bimetallic Complexes with a Calix[6]arene Bearing Ether‐Amide Pendant Arms

Tuning the Stoichiometry of Lanthanide Complexes with Calixarenes: Bimetallic Complexes with a Calix[6]arene Bearing Ether‐Amide Pendant Arms

Naked-Eye Detectable Chiral Recognition Using a Chromogenic Receptor

Propargyl calix[4]arenes and their complexes with silver(I) and gold(I)

Contact Info

Product

Resources

About