An efficient and improved procedure for the synthesis of 1,4-diazepine and 1,5-benzodiazepine derivatives via the reaction of ketimine intermediates with aldehydes in the presence of Keggin-type heteropolyacids (HPAs) was developed. High yields and short reaction times were obtained for both electron-releasing and electron-withdrawing substituted 1,4-diazepine  and 1,5-benzodiazepines derivatives.

Solid acid catalysts, which have favorable characteristics such as efficient activity, high selectivity, long catalyst life and ease in recovery and reuse, have great potential for efficiently transforming lignocellulosic biomass into biofuels and can replace many conventional liquid acids for hydrolysis and pretreatment. This work briefly introduces conventional biomass pretreatment and hydrol...

In this paper, we analysed the influence of corrosion processes and addition a carbon black-heteropoly phosphomolybdic acid (C45-MPA) nanocomposite on operating parameters hydride electrode obtained basis intermetallic compound La2Ni9Co. The electrochemical properties negative electrodes for NiMH batteries were studied using galvanostatic charge/discharge curves, potentiostatic method, impedanc...

El presente artículo describe el desempeño biocatalítico de la enzima peroxidasa soya para oxidar contaminantes acuosos del tipo aromáticos como plaguicidas organofosforados, hidrocarburos policíclicos (HPAs), y flavonoides provenientes residuos agroindustriales. Los ensayos se realizaron en muestras modelo también simuladas efluentes contaminados. análisis realizó por cromatografía líquidos al...

Keggin-type heteropolyacid cesium salts have been regarded as potential candidates for heterogeneous catalytic reactions. This review describes the success of heteropolyacids (Cs-HPA salts) efficient catalysts in various synthesis processes. The Cs-HPA can be synthesized solid through metathesis a solution containing precursor HPA and another soluble Cs salt, which will give salt precipitate. A...

The Friedel-Crafts acylation of furan to produce 2-acyl by using acetic anhydride is industrially important but it uses highly polluting liquid acids as catalysts. In this study, supported modified heteropoly were used heterogeneous catalysts in a solventless green process. Metal exchanged dodecatungstophosphoric acid (DTP) was loaded on three different supports, and its effect evaluated. 20% w...