Abstract
Multiwalled carbon nanotubes (MWCNTs) were grafted with poly(AMPS–co–AM) by free-radical polymerization of acrylamide (AM) and 2–acrylamido–2-methylpropane sulfonic acid (AMPS) monomers initiated by benzoyl peroxide (BPO). MWCNT–poly(AMPS–co–AM) was characterized by Fourier transform–infrared spectroscopy (FT–IR), thermal gravimetric analysis (TGA), scanning electron microscopy (SEM), transmission electron microscopy (TEM), and energy dispersive spectroscopy (EDS). Observation showed that grafting of poly(AMPS–co–AM) to MWCNTs improves solubility of MWCNTs in water, ethanol, and dichloromethane. MWCNT–poly(AMPS–co–AM) also showed good catalytic performance for the preparation of bis(indolyl)methanes and 1,8-dioxo-octahydroxanthenes through the condensation of an aldehyde with indole and 5,5-dimethyl-1,3-cycloheanedione (dimedone), respectively. MWCNT–poly(AMPS–co–AM) catalyst can be reusable for at least up to eight times without significant loss of activity.
Carbon nanotubes grafted with sulfonated polyacrylamide as a heterogeneous catalyst for the preparation of bis-indolylmethanes
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The authors are thankful to the Research Council of Shahrekord University and Marvdasht Branch Islamic Azad University for their partial support of this work.
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Parvanak Boroujeni, K., Asadi, F., Kazemi, R. et al. Carbon nanotubes grafted with sulfonated polyacrylamide as a heterogeneous catalyst for the preparation of bis(indolyl)methanes. J Nanopart Res 21, 151 (2019). https://doi.org/10.1007/s11051-019-4543-0
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DOI: https://doi.org/10.1007/s11051-019-4543-0