In this study, oxidation of some 3,5-diacyl or 3,5-diester 1,4-dihydropyridines to corresponding pyridine derivatives using sodium bromate in the presence of NH4Cl, NaHSO4 and Bu4NHSO4 under thermal conditions has been investigated. The yield and structure of formed products is similar under all conditions; however, the reaction is accelerated in the presence of Bu4NHSO4 and NaHSO4. In addition...

In this research, synthesis and characterization of silver/alumina composite powders was investigated. This kind of metal/ceramic composite powders is used for fabrication of cutting tools inserts. The role of silver is toughening the final product. The powders were synthesized via co-precipitation method. The composition of the synthesized powders was Ag/80% wt 〖Al〗_2 O_3. Silver nitrate, alum...

This article presents the results of experimental studies process grafting humic acids and their functional derivatives on modified unmodified surfaces burnt rock. It is shown that inoculation inorganic carriers more successful with preliminary activation surface rocks. The acidic sorption properties grafted sorbents respect to heavy metal ions have been studied. many modifying additives carrie...

The commercial preparation named “Tripterygium glycosides” prepared by column chromatography has been used for the treatment of inflammatory and autoimmune diseases with significant efficacy but concurrent toxicity. The aim of this study was to reduce the toxicity of Tripterygium extracts, using cytotoxicity and anti-inflammatory activity of the three principal active components of Tripterygium...

The effect of UV/Ozone irradiation together with the pretreatments using distilled water, hydrogen peroxide, and hydrogen peroxide/sodium silicate solutions on the dyeing depth of the poly(lactic acid), PLA, and poly(ethylene terephthalate), PET, fabrics by the application of disperse dyes were investigated and the results were compared with that of untreated fabrics. The results showed that th...