Pd-SBT@MCM-41: As an efficient, stable and recyclable organometallic catalyst for C-C coupling reactions and synthesis of 5-substituted tetrazoles

A palladium S-benzylisothiourea complex was anchored on functionalized MCM-41 (Pd-SBT@MCM-41) and applied as efficient and reusable catalyst for the synthesis of 5-substituted 1H-tetrazoles using [2 + 3] cycloaddition reaction of various organic nitriles with sodium azide (NaN3) in poly(ethylene glycol) (PEG) as green solvent. Also this catalyst was applied as an versatile organometallic catalyst for Suzuki cross-coupling reaction of aryl halides and phenylboronic acid (PhB(OH)(2)) or sodium tetraphenyl borate (NaB(Ph)(4)). This nanocatalyst was characterized by thermal gravimetric analysis (TGA), X-ray Diffraction (XRD), scanning electron microscopy (SEM), inductively Coupled Plasma (ICP) and N-2 adsorption-desorption isotherms techniques. Recovery of the catalyst is easily achieved by centrifugation for several consecutive runs.