Efficiency of NaHSO4 modified periodic mesoporous organosilica magnetic nanoparticles as a new magnetically separable nanocatalyst in the synthesis of [1,2,4]triazolo quinazolinone/pyrimidine derivatives.

Immobilized NaHSO 4 on core/shell phenylene bridged Periodic mesoporous organosilica magnetic nanoparticles (γ-Fe 2 O 3 @Ph-PMO-NaHSO 4 ) as a new acidic magnetically separable nanocatalyst was successfully prepared in three steps: (i) preparation of γ-Fe 2 O 3 nanoparticles by a precipitation method, (ii) synthesis of an organic-inorganic periodic mesoporous organosilica structure with phenyl groups on the surface of γ-Fe 2 O 3 magnetic nanoparticles (MNPs) and (iii) finally adsorption of NaHSO 4 on periodic mesoporous organosilica (PMO) network. The results of N 2 adsorption-desorption isotherms, XRD and TEM showed formation of the Periodic mesoporous organosilica magnetic nanocomposite with the uniform size up to 15 nm. The efficiency of the new catalyst was evaluated in promoting the synthesis of [1,2,4]triazolo quinazolinone/pyrimidine derivatives as important biologically active compounds. Eco-friendly protocol, high yields, short reaction times, reusability of the catalyst and easy and quick isolation of the products are the main advantages of this procedure. [ABSTRACT FROM AUTHOR]