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- Title
Novel ferrocene-based ionic liquid supported on silica nanoparticles as efficient catalyst for synthesis of naphthopyran derivatives.
- Authors
Teimuri-Mofrad, Reza; Gholamhosseini-Nazari, Mahdi; Payami, Elmira; Esmati, Somayeh
- Abstract
We report synthesis of silica nanospheres containing ferrocene-tagged imidazolium acetate (SiO@Im-Fc[OAc]) as efficient heterogeneous nanocatalyst for synthesis of naphthopyran derivatives under solvent-free conditions, based on modification of nano SiO by ionic liquid with ferrocene tags and subsequent anion metathesis reaction. The synthesized novel nanocatalyst (SiO@Im-Fc[OAc]) was systematically characterized using Fourier-transform infrared spectroscopy, energy-dispersive X-ray spectroscopy, X-ray diffraction analysis, and field-emission scanning electron microscopy. The catalytic activity of (SiO@Im-Fc[OAc]) was tested in one-pot three-component reaction of aromatic aldehydes, malononitrile, and 2-naphthol for facile synthesis of naphthopyran derivatives. To achieve high catalytic efficacy, the effects of various reaction parameters such as temperature, amount of catalyst, type of solvent, etc. were investigated. Furthermore, recovery and reuse of the nanocatalyst several times was demonstrated without appreciable loss in catalytic activity. The presented protocol offers several advantages, including green and ecofriendly nature, operational simplicity, higher yield, and easy recovery and reuse of the nanostructured catalyst. The workup of these very clean reactions involves only recrystallization of the product from ethanol and recovery of the catalyst by filtration.
- Subjects
IONIC liquids; FOURIER transform infrared spectroscopy; FERROCENE; SILICA nanoparticles; ENCAPSULATION (Catalysis)
- Publication
Research on Chemical Intermediates, 2017, Vol 43, Issue 12, p7105
- ISSN
0922-6168
- Publication type
Article
- DOI
10.1007/s11164-017-3061-x