To broaden the types of salts studied in high temperature aqueous systems, solubilities of 3-2 samarium sulfate hydrates have been determined in water (25–350°C) and in aqueous sulfuric acid (150–250°C). The values in water for the octahydrate decrease from 0·033 m at 25°C to 8 × 10−6 m f...

Stable sulfated zirconia can be prepared by impregnation with zirconium sulfate on a mesoporous silica type MCM and ulterior calcination at 750 °C. The thermal decomposition of this salt leads to the formation of monoclinic/tetragonal zirconia with some sulfate ions strongly retained, which are...

Zirconium sulfate (ZS) varying in crystalline phase from hydrate to anhydrous was prepared at different treatment temperature. The relationship between microcrystal structure at different treatment temperature and activity in esterification was evaluated. The number of acid groups was found to i...

A new extractant, bis(2-ethylhexyl)-1-(2-ethylhexylamino)propylphosphonate (BEAP or B) was synthesized to extract and separate zirconium and hafnium from sulfate medium. Under optimum conditions, the separation factor of Zr over Hf was found to be 6.8. The extracted complexes were determined to ...

The water-resistant zirconium sulfate tetrahydrate [Zr(SO4)2·4H2O]/tubular carbon membranes (ZS/TCM) were prepared by the wet impregnation of TCM with different ZS loadings, and used as the heterogeneous solid acid catalyst for the esterification of acidified oil with methanol. The composition ...

Incorporating zirconium is one of the most widely applied method to functionalize the inert mesoporous silica. However, the conventional zirconium precursors are are costly and poisonous, and zirconium distributes unevenly in Zr-SBA-15. Herein, a homogeneous Zr-doped SBA-15 material (Zr-SBA-15) ...

Polycyclotrimerization of aromatic dicyanate (i.e. bisphenol A dicyanate (BPADCy)) generates photoluminescent (PL) polycyanate (PCn) crosslinked resin with s-triazine ring as the interconnecting point. This inherent s-triazine ring in PCn resin is hydrogen-bond (H-bond) acceptor; therefore, an H...

The title molecule 1-pyrenecarboxylic acid (1PCA) has been characterized by FTIR, FT-Raman, NMR and UV–Vis spectral analyses. The molecular geometry, harmonic vibrational modes, the corresponding wavenumbers and IR intensities of 1PCA were calculated by DFT method with 6-311G(d,p) basis set. Th...

This manuscript demonstrated a simple and efficient method to detect 1-pyrenecarboxylic acid dissolved in water solution at nanoscale level via surface enhanced Raman scattering hot spot with reduced graphene oxide/silver nanoparticles (Ag-NPs) nanocomposites (RGO/Ag-NPs). Ag-NPs were attached i...

Selective terminal oxidation of 3,3-dimethyl-4-pentenoates does occur under chloride-free Wacker conditions [Pd(OAc)2/O2] in AcOH to give 5-acetoxy-3,3-dimethyl-4-pentenoates (7) and their analogues (2, 8) in good yields. Successive cyclization of 7 and 8 at vapor phase pyrolysis on SiO2 affords...

Glycyrrhizin (GL), a main constituent of liquorice, was hydrolysed to 18β-glycyrrhetic acid mono-β-d-glucuronide (GAMG, glycyrrhetyl monoglucuronide) by rat liver homogenate, and the hydrolytic activity was localized in the lysosomes among the same subcellular fractions as acid β-d-glucuronid...

A series of N-substituted 1-aminomethyl-β-d-glucopyranoside derivatives was prepared. These novel synthetic compounds were assessed in vitro for inhibitory activity against yeast α-glucosidase and both rat intestinal α-glucosidases maltase and sucrase. Most of the compounds displayed α-gluco...

A series of 6-aminomethyl-2-aryl-1-benzopyran-4-one derivatives (10–24) were synthesized. The compounds were tested for anti-inflammatory, analgesic, ulcerogenic and lipid peroxidation actions. Among the tested compounds, six compounds 11, 13, 16, 18, 21 and 23 showed higher degree of anti-infl...

Controlled stepwise reaction of a geminal substituted alkene or primary amine group afforded a small library of new functionalised tertiary and ditertiary phosphines. Accordingly, Mannich based condensation of the commercially available disubstituted arene C6H4(NH2){2-C(Me)=CH2} with HOCH2PR2 (R...

The synthesis, crystal structure and spectroscopic properties of the neodymium(III) complex [Nd(btpa)Cl2]Cl·5H2O with btpa being the octadentate polypyridine ligand 6,6′-bis[bis(2-pyridylmethyl)aminomethyl]-2.2′-bipyridine are reported. The structure shows that the Nd3+ ion is coordinated to ...

An efficient approach for S-methylation of diaryl disulfides with di-tert-butyl peroxide under metal-free and neutral conditions was established. The present protocol shows good functional group tolerance to afford aryl methyl sulfides in moderate to good yields.

Through comparing the linear and nonlinear optical property of two pull-push chromophores, which are composed of difluoroboron β-diketonate functionalized with carbazole and tert-butyl carbazole, the role of tert-butyl in chromosphere has been discussed in detail. The tert-butyl unit would lead...

The kinetics of the liquid-phase addition of 1-propanol to isobutene to produce propyl tert-butyl ether (PTBE) has been studied using the ion-exchange resin Amberlyst™ 35 as the catalyst. Reaction rates free from mass transfer limitations have been experimentally determined in the temperature ra...

We have developed an effective and environmentally benign procedure for the hydroxylation of naphthoquinone derivatives by using tetrabutylammonium iodide as a catalyst and tert-butyl hydroperoxide as an oxidant. This methodology provides a facile protocol for the synthesis of some new naphthoqu...

Di- and tri-tert-butyl glycerol ethers (DTBGE and TTBGE) can be produced at high yields via etherification of glycerol with isobutene over cost effective and commercially available solid acid catalysts. These ethers have a potential to replace methyl-tert-butyl ether, an environmentally unfriend...