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Abstract
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1,2,3-Triazole is an interesting N-heterocyclic framework which can act as both a hydrogen bond donor
and metal chelator. In the present study, C–H hydrogen bonding of the 1,2,3-triazole ring was surveyed
theoretically and the results showed a good agreement with the experimental observations. The clickmodified
magnetic nanocatalyst Pd@click-Fe3O4/chitosan was successfully prepared, in which the
triazole moiety plays a dual role as both a strong linker and an excellent ligand and immobilizes the
palladium species in the catalyst matrix. This nanostructure was well characterized and found to be an
efficient catalyst for the CO gas-free formylation of aryl halides using formic acid (HCOOH) as the most
convenient, inexpensive and environmentally friendly CO source. Here, the aryl halides are selectively
converted to the corresponding aromatic aldehydes under mild reaction conditions and low Pd loading.
The activity of this catalyst was also excellent in the Suzuki cross-coupling reaction of various aryl
halides with phenylboronic acids in EtOH/H2O (1 : 1) at room temperature. In addition, this catalyst was
stable in the reaction media and could be magnetically separated and recovered several times.
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