Synthesis of Fe3O4 Nanoparticles Bound with Polyethylene Glycol Substituted 1-Methyl Imidazolium Bromide and Their Application as Nanomagnetic and Recyclable Phase-transfer Catalysts for the Green and Efficient Synthesis of 4H-pyrans
作者:Faranak Najafi、Mehdi Fallah-Mehrjardi
DOI:10.2174/1570178615666180126155640
日期:2018.7.26
Immobilization of polyethylene glycol substituted 1-methylimidazolium bromide on the surface
of Fe3O4 magnetic nanoparticles led to the synthesis of powerful and recyclable heterogeneous
phase-transfer catalysts which were successfully used for the one-pot three-component condensation of
aryl aldehydes, malononitrile and 1,3-dicarbonyl compounds, to afford the corresponding 2-amino-3-
cyano-4H-pyrans. The catalysts can be readily recovered by simple magnetic decantation, and they can
be reused several times with no considerable loss in their activity.
Polyethylene Glycol-(<i>N</i>
-Methylimidazolium) Hydroxide-Grafted γ-Fe<sub>2</sub>
O<sub>3</sub>
@HAp: A Novel Nanomagnetic Recyclable Basic Phase-Transfer Catalyst for the Synthesis of Tetrahydrobenzopyran Derivatives in Aqueous Media
作者:Hamed Talaei、Mehdi Fallah-Mehrjardi、Fatemeh Hakimi
DOI:10.1002/jccs.201700401
日期:2018.5
Polyethylene glycol‐(N‐methylimidazolium) hydroxide‐grafted hydroxyapatite encapsulated γ‐Fe2O3 nanoparticles, γ‐Fe2O3@HAp@PEG(mim)OH, were prepared and characterized by FTIR, SEM, TEM, TGA, and EDAX. This nanocomposite was applied as a novel, green, nanomagnetic, and recyclablebasic phase‐transfer catalyst for the synthesis of tetrahydrobenzopyrans in high yields via the three‐component reaction