The specific deamidation of 2-acetamido-1,3,4,6-tetra-O-acetyl-alpha-D-glucopyranose is achieved by p-toluenesulfonic acid-promoted hydrolysis of 2-methyl-(3,4,6-tri-O-acetyl-1,2-dideoxy-alpha-D-glucopyrano)-[2,1 -d]-2- oxazoline 2 to give quantitative formation of the 1,3,4,6-tetra-O-acetyl-2-amino-2-deoxy-alpha-D-glucopyranose p-toluenesulfonate (5d). This two-step procedure provides an amino...

Strain SY1, identified as a Corynebacterium sp., was isolated on the basis of the ability to utilize dibenzothiophene (DBT) as a sole source of sulfur. Strain SY1 could utilize a wide range of organic and inorganic sulfur compounds, such as DBT sulfone, dimethyl sulfide, dimethyl sulfoxide, dimethyl sulfone, CS2, FeS2, and even elemental sulfur. Strain SY1 metabolized DBT to dibenzothiophene-5-...

A new series of some novel pyrazinamide condensed 1,2,3,4-tetrahydropyrimidines was prepared by reacting of N-(3-oxobutanoyl)pyrazine-2-carboxamide with urea/thiourea and appropriate aldehyde in the presence of catalytic amount of laboratory made p-toluenesulfonic acid as an efficient catalyst. Confirmation of the chemical structure of the synthesized compounds (4a-l) was substantiated by TLC, ...

Colorimetric gas sensing is demonstrated by thin films based on ultrasmall TiO2 nanoparticles (NPs) on Si substrates. The NPs are bound into the film by p-toluenesulfonic acid (PTSA) and the film is made to absorb volatile organic compounds (VOCs). Since the color of the sensing element depends on the interference of reflected light from the surface of the film and from the film/silicon substra...

The multi-component solid form of febuxostat (FEB) with p-toluenesulfonic acid was synthesized by solvent-drop grinding and cooling-evaporative crystallization characterized powder X-ray diffraction (XRPD), thermogravimetry (TGA), differential scanning calorimetry (DSC), infrared spectroscopy (FT-IR). stable after exposure at elevated temperature relative humidity dissolution measurements revea...

This study compared oxidative delignification of birch kraft pulp fibers to from acid hydrotropic fractionation (AHF) using p-toluenesulfonic (p-TsOH). Under oxygen at 20% consistency, AHF pulps with lower hemicellulose content showed higher than similar lignin despite its residual (cellulosic enzymatic lignin, CEL) being less reactive fewer ?-O-4 ether aryl linkages based on 2D13C-1H nuclear m...

We have used the high nucleophilicity of bromide ion in the form of the ionic liquid, 1-n-butyl-3-methylimidazolium bromide ([bmim][Br]), for the nucleophilic displacement of an alkyl group to regenerate a phenol from the corresponding aryl alkyl ether. Using 2-methoxynaphthalene (1) as a model compound, we found that the combination of ionic liquid [bmim][Br] and p-toluenesulfonic acid with wa...

A low-cost sensor array system for banana ripeness monitoring is presented. The sensors are constructed by employing a graphite line-patterning technique (LPT) to print interdigitated graphite electrodes on tracing paper and then coating the printed area with a thin film of polyaniline (PANI) by in-situ polymerization as the gas-sensitive layer. The PANI layers were used for the detection of vo...

Kết quả nghiên cứu phổ hồng ngoại của DES điều chế cho thấy có sự hình thành tương tác liên kết hydrogen phân tử giữa L-proline và acid para-toluenesulfonic. Điều kiện thực hiện phản ứng tốt nhất thu được sau khi khảo sát: nhiệt độ 80oC, thời gian 120 phút, tỉ lệ benzaldehyde:o-phenylenediamine=2:1 (mmol) lượng xúc sử dụng là 30% mol so với o-phenylenediamine. Xúc thể 4 lần mà không thay đổi ho...