Journal
GREEN CHEMISTRY
Volume 19, Issue 5, Pages 1353-1361Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c6gc03377f
Keywords
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Funding
- Isfahan University of Technology (IUT), IR Iran
- Centre of Excellence in Sensor and Green Chemistry Research (IUT)
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Chitosan ( CS) is a porous, self-standing, nanofibrillar microsphere that can be used as a metal carrier. Amino groups on CS enable to modulate cobalt coordination using a safe organic ligand ( methyl salicylate). This catalyst efficiently promotes Heck cross-coupling of a large library of functional substrates under mild and sustainable conditions ( polyethylene glycol as solvent at 80 degrees C in a short time (1h)). The cobalt complex was also used as a heterogeneous, efficient, inexpensive, and green catalyst for Sonogashira cross-coupling reactions. The reactions of various aryl halides and phenylacetylene provided the corresponding products in moderate to good yields. More importantly, this phosphine, copper, and palladium-free catalyst was stable under the reaction conditions and could be easily reused using an external magnet for at least five successive runs without a discernible decrease in its catalytic activity.
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