Results 81 to 90 of about 973 (110)
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ChemInform, 2005
AbstractFor Abstract see ChemInform Abstract in Full Text.
N. Zh. Mamardashvili, O. I. Koifman
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AbstractFor Abstract see ChemInform Abstract in Full Text.
N. Zh. Mamardashvili, O. I. Koifman
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Journal of the Chemical Society, Perkin Transactions 1, 1992
5-Benzothiazol-1-yl-28-hydroxy-25,26,27-trimethoxycalix[4]arene has been synthesized: this compound acted as a novel fluorogenic calix[4]arene showing ‘perfect’ Li+-selectivity.
Koji Iwamoto +3 more
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5-Benzothiazol-1-yl-28-hydroxy-25,26,27-trimethoxycalix[4]arene has been synthesized: this compound acted as a novel fluorogenic calix[4]arene showing ‘perfect’ Li+-selectivity.
Koji Iwamoto +3 more
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Calix[4]arene-Analogous Technetium Supramolecules
Inorganic Chemistry, 2022Calix[4]arene-analogous technetium supramolecules (1 and 2) were assembled using (NBu4)[Tc2(μ-Cl)3(CO)6] and neutral flexible bidentate nitrogen-donor ligands (L1 and L2) consisting of four arene units covalently joined via methylene units. The neutral homoleptic technetium macrocycles adopt a partial cone/cone-shaped conformation in the solid state ...
Mamina Bhol +4 more
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Tetrahedron Letters, 2001
Abstract Troponoid analogues of calixarene, having a tropone or a cyclohepta[ b ]chromen-6(11 H )-one ring were synthesized by the reaction of dichlorocarbene with p - tert -butylcalix[4]arene. The cyclohepta[ b ]chromene derivative dimerized easily to give meso - and dl -dimers.
Toshihide Hatsui +3 more
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Abstract Troponoid analogues of calixarene, having a tropone or a cyclohepta[ b ]chromen-6(11 H )-one ring were synthesized by the reaction of dichlorocarbene with p - tert -butylcalix[4]arene. The cyclohepta[ b ]chromene derivative dimerized easily to give meso - and dl -dimers.
Toshihide Hatsui +3 more
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Chemistry Letters, 1991
Abstract A chromogenic calix[4]arene which has within a molecule both the triester moiety as a metal-binding site and the azophenol moiety as a coloration site was synthesized. This calix[4]arene showed the high Li+ selectivity.
Hiroyasu Shimizu +3 more
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Abstract A chromogenic calix[4]arene which has within a molecule both the triester moiety as a metal-binding site and the azophenol moiety as a coloration site was synthesized. This calix[4]arene showed the high Li+ selectivity.
Hiroyasu Shimizu +3 more
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Journal of the Chemical Society, Perkin Transactions 1, 1991
A cone-shaped, asymmetrically substituted p-tert-butylcalix[4]arene has been synthesized and optically resolved. The oxygen-through-the-annulus rotation which causes racemization of these ringoriginating optical isomers is suppressed by four O-propyl substituents.
Seiji Shinkai +4 more
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A cone-shaped, asymmetrically substituted p-tert-butylcalix[4]arene has been synthesized and optically resolved. The oxygen-through-the-annulus rotation which causes racemization of these ringoriginating optical isomers is suppressed by four O-propyl substituents.
Seiji Shinkai +4 more
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Conformational properties of cyanomethoxy calix[4]arenes
Organic & Biomolecular Chemistry, 2005O-Alkylation of the dinitro calix[4]arene 2, easily available by selective ipso-nitration of the di-cyanomethyl ether 1, with allylbromide (DMF/Cs2CO3) gave tetraethers 3 and 4 with anti- and syn-orientations of the two allyl ether residues. The two possible stereoisomers of in the partial cone and 1,2-alternate conformation exist as an equilibrium ...
Crenguta, Danila +2 more
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Unsymmetrical Calix[4]arene Bisporphyrin Pacman
Organic Letters, 2007[structure: see text] The synthesis of a Pacman heterobisporphyrin associating an octaethyl porphyrinatozinc (ZnOEP) energy donor and a triaryl porphyrinatozinc (ZntPP) energy acceptor around a calix[4]arene spacer is described. Contrary to previous symmetrical architectures, correlations between the chromophores in the unsymmetrical calixarene ...
Grégory, Pognon +2 more
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Calix[4]arene nitroxide tetraradical and octaradical
Chemical Communications, 20111,3-Alternate calix[4]arene with para-phenylene spacers connecting nitroxide monoradicals and high-spin (S = 1) diradicals provides tetraradical and octaradical scaffolds that possess conformations with slow electron spin relaxation rates (1/T(1)).
Arnon, Olankitwanit +5 more
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Selective nitration of calix[4]arenes that easily gave inherently chiral calix[4]arenes
Journal of Inclusion Phenomena and Macrocyclic Chemistry, 2014Proximally dietherified calix[4]arene at lower rim was selectively nitrated to give mononitrocalix[4]arene, dinitrocalix[4] arene, and trinitrocalix[4]arene, respectively, under different reaction conditions. These three nitrocalix[4]arenes could be purified in good yield just by recrystallization, which provided a concise approach to inherently chiral
Jin-Hua Wang +3 more
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