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• W2950377606 abstract "Abstract The volcanic ash from the Andes mountain range (Puyehue-Cordon Caulle volcanic complex situated in western South America on the Argentinean-Chilean border) was used as heterogeneous acid catalyst in the suitable synthesis of 3 H -1,5-benzodiazepines. The natural ashes were classified according to their particle size to generate the different catalytic materials. The catalysts were characterized by powder X-ray diffraction (XRD), scanning electron microscopy (SEM) with energy dispersive spectroscopy (EDS), vibrational spectroscopies (FT-IR and Raman), and textural properties were determined by N 2 adsorption (S BET ). Potentiometric titration with n-butylamine was used to determine the acidic properties of the catalytic materials. Several 3 H -1,5-benzodiazepines were obtained by reaction of o -phenylenediamine and substituted 1,3-diphenyl-1,3-propanedione in solvent-free conditions, giving good to excellent yields of a variety benzodiazepines. The method was carried out in environmentally friendly conditions and it was operationally simple. The volcanic ash resulted in a safe and recyclable catalyst." @default.
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• W2950377606 date "2019-01-28" @default.
• W2950377606 modified "2023-10-16" @default.
• W2950377606 title "Volcanic ash as reusable catalyst in the green synthesis of 3H-1,5-benzodiazepines" @default.
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• W2950377606 doi "https://doi.org/10.1515/gps-2019-0030" @default.
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