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- Title
Equisetum arvense As an abundant source of silica nanoparticles. SiO<sub>2</sub>/H<sub>3</sub>PW<sub>12</sub>O<sub>40</sub> nanohybrid material as an efficient and environmental benign catalyst in the synthesis of 2-amino-4H-chromenes under solvent-free conditions
- Authors
Tayebee, Reza; Pejhan, Akbar; Ramshini, Hassan; Maleki, Behrooz; Erfaninia, Nasrin; Tabatabaie, Zohre; Esmaeili, Effat
- Abstract
Uniform SiO2 nanoparticles were successfully prepared from Equisetum arvense obtained from the north-east of Iran. Then, surface modification of the extracted nanoparticles was performed with a methanol solution of H3PW12O40 via wet impregnation method. The prepared nanocatalyst was characterized by XRD, FESEM, ICP, UV-Vis, and FT-IR spectroscopy. The supported heterogeneous nanocatalyst was successfully applied as a Lewis/Bronsted acid catalyst in the synthesis of a series of substituted 4H-chromenes via condensation of aromatic aldehydes, malononitrile, and 4-hydroxycoumarin under solventless conditions with fine yields in appropriately short times.
- Subjects
EQUISETUM; SILICA; NANOPARTICLES; SILICON oxide; ALDEHYDES; CHEMICAL synthesis
- Publication
Applied Organometallic Chemistry, 2018, Vol 32, Issue 1, pn/a
- ISSN
0268-2605
- Publication type
Article
- DOI
10.1002/aoc.3924