Solvent-free Heck reaction catalyzed by a recyclable Pd catalyst supported on SBA-15 via an ionic liquid

Heck arylation of olefins with aryl halides was carried out in solvent-free conditions with a Pd catalyst supported on 1,1,3,3-tetramethylguanidinium (TMG)-modified molecular sieve SBA-15 (designated as SBA-TMG-Pd). SBA-TMG-Pd was much more active and stable than a Pd catalyst supported on pristine SBA-15 (designated as SBA-Pd). The catalysts were characterized by Fourier transform infrared spectroscopy (FT-IR), X-ray photoelectron spectroscopy (XPS), and transmission electron microscopy (TEM), and the reasons for the excellent performance of catalyst SBA-TMG-Pd were also discussed.