Background: The palladium-catalyzed couplings of alkenes with aryl halides is considered
as one of the most important methods for carbon-carbon bond formation and have been utilized in the
areas of natural products, high performance materials, bioactive compounds, new drugs and many industrially
useful chemicals. Although the homogeneous palladium catalysts offer several advantages
concerning higher selectivity and yields, better tuning of chemoselectivity and high efficiency but
commercializing most of homogeneous has not been possible because of recycling problem of the catalyst
from the mixture of reaction. Therefore, for resolving this problem, immobilization of homogeneous
Pd complexes via grafting to solid supports such as activated carbon, zeolites, silica or modified silica,
polymers, nanoparticles, and magnetic core shells have been subject of great challenges.
Methods: Fe3O4 nanoparticles was coated by silica gel and then decorated by Schiff base Pd complex to
provide Fe3O4@SiO2/Schiff base/Pd(II) nanoparticles. After optimization of reaction parameters, Heck-
Mizoroki coupling reaction of aryl halides with olefins was studied.
Results: The magnetic Schiff base complex of Pd, as a phosphine free nanocatalyst, catalyzed efficiently
Heck-Mizoroki carbon-carbon coupling reaction between aryl halides and alkenes and provided
the desired products in high yields. The magnetic Pd complex was easily removed from the reaction
mixture and reused for eight runs.
Conclusion: A new efficient, simple and cost effective protocol was introduced for carbon-carbon bond
formation via Heck-Mizoroki coupling reaction of aryl halides with olefins in high to excellent yields in
short reaction times. These valuable advantages were achieved because of employing
Fe3O4@SiO2/Schiff base/Pd(II) complex as a dispersible, phosphine free ligand, highly active, magnetically
recoverable and reusable several times.