Polyethylene Glycol‐(N‐Methylimidazolium) Hydroxide‐Grafted γ‐Fe₂O₃@HAp: A Novel Nanomagnetic Recyclable Basic Phase‐Transfer Catalyst for the Synthesis of Tetrahydrobenzopyran Derivatives in Aqueous Media

Abstract

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 recyclable basic phase‐transfer catalyst for the synthesis of tetrahydrobenzopyrans in high yields via the three‐component reaction of aromatic aldehydes, malononitrile, and dimedone or 1,3‐cyclohexanedione in aqueous media at ambient temperature.

MnFe2O4 nanoclusters as labels for the quantitative detection of D‐dimer in a lateral‐flow immunochromatographic assay

“…As shown in Figure a, ligand exchange with DHCA was verified by Fourier transform infrared (FTIR) spectroscopy . The magnetic nanoparticles covered with oleic acid showed strong CH 2 peaks at 2,921, 2,850, and 1,420 cm −1 before modification.…”

An overview of recent advances in the catalytic synthesis of substituted pyrans

“…The catalytic efficiency of synthesized catalyst was investigated for the pyran derivatives employing diketo group, malononitrile, and aromatic aldehydes in ethanol for an adequate period of time (15–110 min). Talaei and co‐workers [ 75 ] synthesized Fe 2 O 3 nanoparticle‐based phase transfer catalyst γ‐Fe 2 O 3 @HAp@PEG (mim)OH. The authors examined catalytic efficiency of the catalyst for the synthesis of pyran analogs under ambient reaction conditions.…”

γ‐Fe2O3@HAp@PBABMD@Cu magnetic nanoparticles: Efficient, green, and recyclable novel nanocatalyst for the synthesis of densely functionalized pyrrole‐pyrido[2,3‐d]pyrimidine hybrids

“…Green chemistry is a concept that has been getting great attention in recent years by chemists and researchers. 1 Also, catalysis is becoming a strategic field of science because it represents a new way to confront the challenges of energy and sustainability. 2,3 Furthermore, one of the key strategies in the efficient green catalysts field is the design and development of new solids for heterogeneous catalytic processes that meet both efficiency and selectivity criteria while permitting recovery, reactivation, and reuse during numerous cycles, without mass losses.…”

“…Green chemistry is a concept that has been getting great attention in recent years by chemists and researchers 1 . Also, catalysis is becoming a strategic field of science because it represents a new way to confront the challenges of energy and sustainability 2,3 .…”