Journal
JOURNAL OF CATALYSIS
Volume 391, Issue -, Pages 312-326Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcat.2020.08.031
Keywords
Poly(ionic liquid)s; Mesoporous structure; DABCO; Magnetic particles; Recyclability; Multiple-component reactions
Categories
Funding
- National Natural Science Foundation of China [21978154, 21576176]
Ask authors/readers for more resources
The preparation of well-defined porous materials as carriers is critically fundamental for the design of heterogeneous catalysts. In this study, 1,4-Diazabicyclo[2.2.2]octane (DABCO) based hypercross-linked ionic copolymers with well-developed mesopores were fabricated, in which the alkene modified ferric oxides nanoparticles play a vital role for the formation of the mesoporous structure. The magnetic copolymers, fully characterized by N-2 adsorption-desorption, scanning electron microscopy (SEM)/transmission electron microscopy (TEM), X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), thermogravimetric analysis (TGA), and vibrating sample magnetometer (VSM), exhibited abundant active ionic centers, rich mesoporosity and moderate surface area. The as-prepared materials were found to be used as efficient catalysts for one-pot synthesis of indole derivatives and 3,4-fused indoles with seven-membered ring and good to excellent products yields were achieved within 10 h. The kinetic study revealed that the meso-porosity increased the catalytic efficiency in terms of reaction rate and yield, albeit with mass transfer resistance produced by mesoporous channels. Finally, the catalyst could be readily recovered using external magnetic force and recycled at least ten times without significant loss in catalytic activities, which makes it attractive for green transformation in chemical industry. (C) 2020 Elsevier Inc. All rights reserved.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available