Journal
APPLIED ORGANOMETALLIC CHEMISTRY
Volume 31, Issue 12, Pages -Publisher
WILEY
DOI: 10.1002/aoc.3891
Keywords
cobalt ferrite nano-particles; nano-magnetic composite; quinolines; spiro-oxindoles; zwitterionic chitosan
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Funding
- Research Council of University of Guilan
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A nano-magnetic core-shell composite fabricated of a unique zwitterionic chitosan-derived coating and cobalt ferrite core was found to be a green and reusable heterogeneous catalyst for efficient synthesis of pyrano[3,2-c]quinoline and spiro-oxindole derivatives in high to excellent yields. Due to having negative charges at its outermost layer and a high magnetization, the catalyst is finely dispersed in ethanol and can be easily separated from reaction mixtures by using a simple external magnet. It is reasonably stable as can be reused several times without appreciable loss of catalytic activity.
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