Silica nanospheres KCC-1 as a good catalyst for the preparation of 2-amino-4H-chromenes by ultrasonic irradiation

Abstract

Fibrous nano-silica sphere (KCC-1) has appeared as a good and efficient catalyst for ultrasonic irradiation conditions in chemical reactions. This catalyst has the unique properties such as a fibrous surface morphology, high surface area and high mechanical stability. The results indicated that the KCC-1 nanocatalyst could be used as high-performance catalysts under high temperature and pressure condition in organic reaction under ultrasonic irradiation. Morphology, structure, and composition of the fibrous nano-silica sphere were described by N2 adsorption–desorption analysis, scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray powder diffraction (XRD), thermogravimetric analysis (TGA) and Fourier-transform infrared spectroscopy (FT-IR). In this work, we used KCC-1@NH2 nanosilica as a basic catalyst for the preparation of chromenes under ultrasonic irradiation conditions for the first time. The recyclability, nontoxicity and high stability of the catalyst, combined with low reaction times and excellent yields, make the present protocol very useful for the synthesis of the title products under ultrasonic conditions. The produced products were confirmed via 1H NMR, 13C NMR, FT-IR analysis.

Organically surface engineered mesoporous silica nanoparticles control the release of quercetin by pH stimuli

“…2 c). The porous silica-based material is often found to have good thermal stability indicated by no degradation occurring above 200 °C up to 600 °C, which was also found by Oboudatian and Safaei-Ghomi 43 . The MSN-AmEA, on contrary, has three degradation profiles, clearly revealed in Fig.…”

Mussel-inspired HA@TA-CS/SA biomimetic 3D printed scaffolds with antibacterial activity for bone repair

“…X-ray diffraction ( Figure 2H ) and FTIR ( Figure 2I ) showed the DMON and DMON@Cur structural characteristics spectroscopy. As shown in the XRD patterns ( Figure 2H ), characteristic diffraction peaks of amorphous SiO 2 within 15°–30° for mesoporous silica and the main diffraction peaks of curcumin appeared at 2θ = 17–28°( Ou et al, 2018 ; Oboudatian and Safaei-Ghomi, 2022 ). The FTIR ( Figure 2I ) showed the typical peaks of the DMON could be observed in the region of 1092–1150 cm −1 , reflecting the Si–O–Si asymmetric stretching vibration, Si–O–Si peak was observed at 812 cm −1 , which represented the symmetric stretching vibration.…”

Organically Surface Engineered Mesoporous Silica Nanoparticles Control the Release of Quercetin by pH Stimuli

“…The porous silica-based material is often found to have good thermal stability in which there is no degradation occurred within high temperature (in this experiment was up to 600 °C), which is also found by Oboudatian and Safaei-Ghomi. 37 The MSN-AmEA, on contrary, has three degradation pro les, clearly revealed in Figure 2(c). The rst degradation is related to the loss of 23% of water molecules.…”