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Arene Derivatives (arene + derivative)
Selected AbstractsChemInform Abstract: Unique Versatility of Ionic Liquids as Clean Decarboxylation Catalyst Cum Solvent: A Metal- and Quinoline-Free Paradigm Towards Synthesis of Indoles, Styrenes, Stilbenes and Arene Derivatives under Microwave Irradiation in Aqueous Conditions.CHEMINFORM, Issue 19 2009Abhishek Sharma Abstract ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a "Full Text" option. The original article is trackable via the "References" option. [source] Studies on Properties of p -Nitrophenylazo Calix[4]arene DerivativesCHINESE JOURNAL OF CHEMISTRY, Issue 2 2003Jin Chuan-Ming Abstract The p -nitrophenylazo calix[4]arene derivatives 1a-1d with nonlinear optical (NLO) properties were prepared by the diazo-coupling reaction of calix[4]arene with p -nitrophenyl diazonium. The diazotization reaction of p -nitroaniline was carried out with isoamyl nitrite as a source of nitrous add in EtONa/EtOH under refluxing condition. X-Ray crystallographic analysis and 1H NMR spectra reveal that they exist as cone conformation in crystal state or in solution. HRS measurements at 1064 nm in THF indicate that p -nitro-phenylazo calix[4]arenes have higher hyperpolarizability ,z values than the corresponding reference compound 4-(4-nitrophenylazo)-2, 6-dimethyl-phenol, without red shift of the charge transfer band. The tetrakis p -nitrophenylazo calix[4]arene (2) with longer alkyl chains can form monolayer at the air/water interface. [source] Soft Metal Ion-Selective Electrodes Based on ,-Coordinate Calixarene DerivativesELECTROANALYSIS, Issue 15-16 2003Setsuko Yajima Abstract Calix[4]arene derivatives incorporating ,-unsaturated alkenyl groups or saturated alkyl groups and their monomeric analogues were used as ,-coordinate neutral carriers for ion-selective electrodes (ISEs) of soft metals [silver and thallium(I)] ions. The EMF responses were excellent for most of the ISEs, among which there was no significant difference in the response. The ion selectivities of the ISEs depend on the structure of neutral carriers employed. 1H NMR study explains the difference in the ion selectivity. In the metal-ion complexation by the ,-coordinate calixarene derivatives, thallium ion is likely to interact with the calixarene skeleton, while silver ion tends to interact with both of the calixarene skeleton and the ,-unsaturated alkenyl groups. [source] Synthesis of fully lower-rim, carbonate-bridged calix[8]arenes and their curing behaviorJOURNAL OF POLYMER SCIENCE (IN TWO SECTIONS), Issue 8 2001Takuo Sugioka Abstract Novel fully lower-rim, carbonate-bridged calix[8]arene derivatives were successfully synthesized in high yield by the condensation of p -alkyl substituted calix[8]arenes with triphosgene. Different bases and catalysts were used for the preparation depending on the p -alkyl substituted groups of the calix[8]arenes. The conformational features of the derivatives were examined by 1H NMR analysis. Thermosetting formulations were prepared from a mixture of bisphenol A polycarbonate with calix[8]arene carbonate derivatives using sodium benzoate as a catalyst. Their crosslinking behaviors were studied using differential thermal/thermogravimetric analysis. No glass-transition temperatures were observed after annealing at 280,300 °C. © 2001 John Wiley & Sons, Inc. J Polym Sci A: Polym Chem 39: 1149,1155, 2001 [source] Self-inclusion structure of 5,11,17,23-tetrakis(azidomethyl)-25,26,27,28-tetrahydroxycalix[4]arene, and 5,11,17,23-tetra- tert -butyl-25,27-bis(chloroacetoxy)-26,28-bis(2-pyridylmethoxy)calix[4]areneACTA CRYSTALLOGRAPHICA SECTION C, Issue 4 2009Mei Zhao In the structures of the two title calix[4]arene derivatives, C32H28N12O4, (I), and C60H68Cl2N2O6, (II), compound (I) adopts an open-cone conformation in which there are four intramolecular O,H...O hydrogen bonds, while compound (II) adopts a distorted chalice conformation where the two pendant pyridyl rings, one of which is disordered, are almost mutually perpendicular, with an interplanar angle of 79.2,(2) or 71.4,(2)°. The dihedral angles between the virtual plane defined by the four bridging methylene C atoms and the phenol rings are 120.27,(7), 124.03,(6), 120.14,(8) and 128.25,(7)° for (I), and 95.99,(8), 135.93,(7), 97.21,(8) and 126.10,(8)° for (II). In the supramolecular structure of (I), pairs of molecules associate by self-inclusion, where one azide group of the molecule is inserted into the cavity of the inversion-related molecule, and the association is stabilized by weak intermolecular C,H...N hydrogen bonds and ,(N3),,(aromatic) interactions. The molecular pairs are linked into a two-dimensional network by a combination of weak intermolecular C,H...N contacts. Each network is further connected to its neighbor to produce a three-dimensional framework via intersheet C,H...N hydrogen bonds. In the crystal packing of (II), the molecular components are linked into an infinite chain by intermolecular C,H...O hydrogen bonds. This study demonstrates the ability of calix[4]arene derivatives to form self-inclusion structures. [source] Studies on Properties of p -Nitrophenylazo Calix[4]arene DerivativesCHINESE JOURNAL OF CHEMISTRY, Issue 2 2003Jin Chuan-Ming Abstract The p -nitrophenylazo calix[4]arene derivatives 1a-1d with nonlinear optical (NLO) properties were prepared by the diazo-coupling reaction of calix[4]arene with p -nitrophenyl diazonium. The diazotization reaction of p -nitroaniline was carried out with isoamyl nitrite as a source of nitrous add in EtONa/EtOH under refluxing condition. X-Ray crystallographic analysis and 1H NMR spectra reveal that they exist as cone conformation in crystal state or in solution. HRS measurements at 1064 nm in THF indicate that p -nitro-phenylazo calix[4]arenes have higher hyperpolarizability ,z values than the corresponding reference compound 4-(4-nitrophenylazo)-2, 6-dimethyl-phenol, without red shift of the charge transfer band. The tetrakis p -nitrophenylazo calix[4]arene (2) with longer alkyl chains can form monolayer at the air/water interface. [source] Molecular Design of Calixarene 5.CHINESE JOURNAL OF CHEMISTRY, Issue 3 2001Cation Selectivities of Novel Schiff's Base p-tert -Butylcalix[4]arenes, Syntheses Abstract Five novel Schiff's bases p-tert -butylcalix[4]arenes have been synthesized in high yields by the reaction of 1,3-distally disubstituted p-tert -butylcalix[4]arene amine (1) with the corresponding aromatic aldehydes, and their cation binding abilities and selectivities with alkali and heavy metal ions have been evaluated by solvent extraction of aqueous metal picrates to show the highest Ag+ extractability for Schiff's base p-tert- butylcalix[4]arene (6) and the best Na+/Li+ and Ag+/Ti+ selectivities for Schiff's base p-tert -butylcalix[4]arene (4 and 2) over any other calix[4]arene derivatives, respectively. [source] | ||||||||||