Calixarenes 9

Gutsche, C. David; Dhawan, Balram; Levine, Jeffrey A.; No, Kwanghyun; Bauer, Lorenz J.

doi:10.1016/s0040-4020(01)88541-0

Cited by 418 publications

(265 citation statements)

References 21 publications

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“…This might suggest that the corporation and combination between nitrogen and thio group or nitrogen and oxgzene functional groups in the appended moiety structure could be more effective to show high extractability for metal cations. For the pyrazole appended calix [4] arene (9), the same tendency of extration ability was seen as the same for 6. The 1,H-NMR spectrum attributed to the aromatic proton of 9 a ppears singlet and the bridged methylene signal does two broad singlet, which means 9 should have a cone shape being probably fit to complex with Hg+.…”

Section: Resultssupporting

confidence: 61%

Liquid-Liquid Extraction of Transition and Alkali Metal Cations by New Calixes.

Hamada

Kondo

Suzuki

et al. 1994

Int. J. Soc. Mater. Eng. Resour

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The liquid-liquid extraction of various metal ions by a couple new calix [4] arenes, which have aminobenzene carboxylic acid , benzothiazole, and benzoxazole, thiomethyl, and pyrazple group the upper rim of calix . These ligands of extraction ability for metal cations including alkali and transition metal ones using picrate counter ion have been examined.Benzothiazole and benzoxazole modified calix [4] arene derivatives (4 and 5 respectively) were converted to the phenol derivatives using BBr3. The benzothiazole phenol derivative (6) shows high selective extraction ability for Cu 2+ and Hg+ , but the benzoxazole derivative (7) does show extractability for only Hg On the other hand , the methoxy calix [4] arene derivatives except thiomethyl appended derivative (8) show higher metal binding ability in this system .

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Section: Resultssupporting

confidence: 61%

Liquid-Liquid Extraction of Transition and Alkali Metal Cations by New Calixes.

Hamada

Kondo

Suzuki

et al. 1994

Int. J. Soc. Mater. Eng. Resour

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“…The precursor compounds 5,11,17,23-tetra-tert-butylcalix [4]arene, l a (2l), calix[4jarene l b (22), 5,l l,17,23-tetratert-butyl-25,27-bis(propargyl)calix [4]arene, 2a (7), and [AuCl(SMe,)] (19) were prepared by literaturemethods.Molecular modeling was carried out using PCMODEL., NMR spectra were collected by using a Varian Gemini 300 spectrometer. 'H and chemical shifts weremeasured relative to partially deuterated solvent peaks, but are reported relative to tetramethylsilane.…”

Section: Methodsmentioning

confidence: 99%

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

Xu¹,

Vittal²,

Puddephatt³

1996

Can. J. Chem.

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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)

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“…The conformation of a specific calix [4]arene sample can be easily distinguished by its characteristic 1 H-NMR patterns arising from the ArCH 2 Ar methylene protons. [44][45][46][47] Cone conformation is a preferred conformation which corresponds to the minimum energy. The cone conformer is identified by one characteristic pair of doublets of the Ar-CH 2 -Ar methylene protons (AB system, a coupling constant 2 J = 12-15 Hz is characteristic for geminal protons).…”

Section: Resultsmentioning

confidence: 99%

Synthesis of a Series of Novel Tetra-tert-butylcalix[4]arene Linked to 1,2,4-Triazole and 1,3,4-Oxadiazole Derivatives

Dilmaghani¹,

Ghezelbash²

2016

ACSi

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A series of tetra-tert-butylcalix[4]arene linked to 1,2,4-triazole-5-thiones and 1,3,4-oxadiazole-5-thiones derivatives at lower rim were synthesized by the reaction of 1,2,4-triazole-5-thione and 1,3,4-oxadiazole-5-thione with 5,11,17,23-tetra-tert-butyl-25,27-bis(3-bromopropoxy)-26,28-dihydroxycalix[4]arene (2). The synthesized compounds were characterized by FT-IR, 1 H NMR, 13 C NMR spectral data, elemental analysis and ESI-MS.

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Calixarenes 9

Cited by 418 publications

References 21 publications

Liquid-Liquid Extraction of Transition and Alkali Metal Cations by New Calixes.

Liquid-Liquid Extraction of Transition and Alkali Metal Cations by New Calixes.

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

Synthesis of a Series of Novel Tetra-tert-butylcalix[4]arene Linked to 1,2,4-Triazole and 1,3,4-Oxadiazole Derivatives

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