Anion-exchange membranes (AEM) are prepared from chloromethylated poly(ether ether ketone) (CMPEEK), which is quaternized by N,N,N′,N′-tetramethyl-1,4-phenylenediamine (TMPD) and 1-methylimidazole using a two-step method. TMPD can not only improve the mechanical properties but also provide mor...

Electrochemical oxidation of N,N,N’,N’-tetramethyl-1,4-phenylenediamine (TMPD) has been studied in the absence and presence of arylsulfinic acids as nucleophiles in water/ethanol mixtures using cyclic voltammetry. The results imply that, TMPD under two one-electron oxidation steps yields the c...

Electrochemical oxidation of N,N,N′,N′-tetramethyl-1,4-phenylenediamine (TMPD) to its cation radical (TMPD•+) and dication (TMPD++) in various nonaqueous solvents was studied using the cyclic voltammetry technique on a glassy carbon electrode. The variation of the half-wave potentials (E1/2) w...

Phosphomolybdic (PMo) and vanadium-containing phosphomolybdic (PV2Mo) acids were synthesized and supported on HZSM-5 zeolite via a wet impregnation technique and used as photocatalysts for the purification of terephthalic acid (TA) via an economic process. Nowadays, purified TA can be obtained f...

We study the production of terephthalic acid (TA) from biomass-derived aromatic oxygenates. Among several heterogeneous catalysts tested, a carbon-supported Ir catalyst in 4-heptanone solvent gives the best TA yield from 1,4-dihydroxymethylbenzene. A maximum 76% TA yield is achieved at 100 °C a...

Terephthalic acid has been investigated by Raman spectroscopy up to 15 GPa. According to ab initio calculations, it can be speculated that both of π-π stacking interactions between molecules and the symmetry of hydrogen bonds are enhanced with gradually increasing pressure. Furthermore, we use...

Concentrations of three monomers used in the manufacture of polyester resins for food cans, isophthalic acid (IPA), terephthalic acid (TA) and nadic acid (NA), and two oligomers were determined in canned food samples. All canned foods were purchased in local supermarkets in the United States. Co...

This study presents a new approach to produce furfural from xylose using terephthalic acid (TPA) as dual acid catalyst in a water-toluene biphasic system. The process utilizes dual properties of terephthalic acid; its acidity and extremely different solubility at ambient and operating conditions...

In this article, studies have been performed on the treatment of benzoic acid (BA), terephthalic acid (TPA) and COD from synthetic binary solution of PTA wastewater. Acid precipitation pretreatment of aqueous solution was performed initially at different pH (2–5) and temperature (15–60 °C). T...

Two monomers o-(m-triphenyl)-terephthaloyl chloride (TPH1-COCl) and m-(m-triphenyl)- isophthaloyl chloride (TPH2-COCl) with bulky pendant groups were prepared, and they were polymerized with p-phenylenediamine (PPD) or copolymerized with PPD and terephthaloyl chloride (TPC) to prepare aromatic p...

The crystal structures of two ortho-hydroxyacetophenones (5-cyano-2-hydroxyacetophenone and 2-hydroxy-4-methoxy-5-nitroacetophenone) were determined by X-ray diffraction at 100 K. These experimental values are compared with quantum mechanical DFT calculations (B3LYP/6-311++G(d,p)). DFT calculati...

N(4)-Methyl-4-nitroacetophenone thiosemicarbazone (H4NO2Ac4M, 1) and its nickel(II) complex ([Ni(4NO2Ac4M)2], 2) were obtained and fully characterized. Compound 1 crystallizes in the triclinic P1¯ space group and adopts the 1-E,E configuration in relation to the imino and thioamide groups, resp...

N4-Methyl-4-nitroacetophenone thiosemicarbazone (H4NO2Ac4M, 1), N4,N4-dimethyl-4-nitroacetophenone thiosemicarbazone (H4NO2Ac4DM, 2) and N4-piperidyl-4-nitroacetophenone thiosemicarbazone (H4NO2Ac4Pip, 3) and their copper(II) complexes [Cu(4NO2Ac4M)2] (4), [Cu(4NO2Ac4DM)2] (5) and [Cu(4NO2Ac4Pip...

The standard (p° = 0.1 MPa) molar enthalpies of formation, in the condensed phase, of 3′- and 4′-nitroacetophenones, presented in this work, were obtained from measurements of their combustion energies, at T = 298.15 K, using a static bomb calorimeter.The vapor pressures of the two crystallin...

The hydrogenation of 4-nitroacetophenone (4-NAP) and 4-aminoacetophenone (4-AAP) was examined over rhodium/silica catalysts. The reactions were carried out using isopropanol as the solvent under a range of temperatures (303–333 K) and pressures (1–5 barg). An activation energy of 50 ± 4 kJ mo...

The transalkylation of diisopropylbenzene with naphthalene has been studied over two series of mordenite catalysts dealuminated by acid treatments and by combined calcination at 750°C and acid attack treatments, respectively. The nature and accessibility of the acid sites were studied by IR spe...

Tie line data have been determined at 323.15, 348.15 and 373.15 K for the ternary liquid–liquid equilibria (LLE) of alkane (C10/C12/C14)+1,4-diisopropylbenzene+sulfolane systems. The addition of 1,4-diisopropylbenzene to sulfolane is found to increase the solubility of alkanes in the order of n...

A series of montmorillonite-based clays as acid character catalysts (KSF, KSF/0, K0, KP10, K10, KS from Süd Chemie) and their ion-exchanged derivatives with Zn2+, Mg2+, Cu2+, Al3+, Fe3+, Sn2+ were used in the decomposition process of the dihydroperoxide of 1,4-diisopropylbenzene whose conversio...

4-Nitroanisole photoreacts with n-hexylamine and ethyl glycinate giving rise to regioselective methoxy and nitro group photosubstitutions respectively. Mechanistic evidences indicate the last is produced through a SN23Ar* reaction whereas the first arises from a radical ion pair via electron tra...

The photosubstitutions of 2-fluoro-4-nitroanisole with several amines are studied from the preparative and the preliminary mechanistic points of view. The possible usefulness of this structure as biochemical photoprobe is discussed.