Magnetic mesoporous SBA‐15 functionalized with a NHC Pd(II) complex: An efficient and recoverable nanocatalyst for Hiyama reaction

A1 Originalartikel i en vetenskaplig tidskrift (referentgranskad)


Interna författare/redaktörer


Publikationens författare: Ayat Nuri, Yagoub Mansoori, Abolfazl Bezaatpour, Andrey Shchukarev, Jyri‐Pekka Mikkola
Publiceringsår: 2019
Tidskrift: ChemistrySelect
Tidskriftsakronym: ChemistrySelect
Volym: 4
Nummer: 5
Artikelns första sida, sidnummer: 1820
Artikelns sista sida, sidnummer: 1829
eISSN: 2365-6549


Abstrakt

Magnetite nanoparticles (MNPs) were covered by a silica shell and then embedded into mesoporous silica (SBA‐15). Magnetic mesoporous silica (Fe3O4@SiO2‐SBA) was then reacted with 3‐chloropropyltriethoxysilane (CPTS), sodium salt of imidazole and 2‐bromopyridine to give Fe3O4@SiO2‐SBA functionalized with 3‐(pyridin‐2‐yl)‐1H‐imidazol‐3‐ium‐propyl (PIP) as a supported pincer ligand for Pd(II). The functionalized magnetic mesoporous silica were then treated with t‐BuOK at −80 °C in THF and then reacted with [PdCl2(SMe2)2] to give supported Pd(II)‐carbene complex containing C,N‐bidentate ligand. The chloride ions were then exchanged by bromide ions using a NaBr solution of diethylether/acetone mixture. The prepared catalyst was characterized with, FT‐IR, thermo gravimetric analysis (TGA), scanning electron microscopy (SEM), transmission electron microscopy (TEM), vibrating sample magnetometry (VSM), Brunauer–Emmett–Teller surface area measurement (SBET), energy dispersive X‐ray analysis (EDX) and wide angle X‐ray diffraction spectroscopy (XRD). The prepared magnetic catalyst was effectively used in the coupling reaction of triethoxyphenylsilane with aryl halides (Hiyama reaction) in the presence of a base. The reaction parameters such as solvents, amount of catalyst, base and temperature were optimized. The catalyst was then magnetically decanted, washed, and reused several times.


Nyckelord

Chemical Engineering

Senast uppdaterad 2020-18-09 vid 05:44