In the present study, ZnO modified with rare earth oxides GdxMn; M=Mo, V, W) were synthesized by hydrothermal process and their catalytic activity was tested in an oxidative cyclization reaction for the selective synthesis of quinazolinones. The catalysts were characterized by various techniques such as BET surface area analysis, XRD, SEM‐EDX, DSC‐TGA, ICP‐MS and elemental color mapping. 5 wt% Gd2MoO6/ZnO exhibited good catalytic activity and gave 60–91% of Quinazolin‐4(3H) ones in toluene. The catalysts could be reused at least four times without loss of catalytic activity.
In the present study, a novel protocol for the synthesis of 2‐aminothiazoles has been developed using a graphene oxide (GO) stabilized Pickering emulsion system. GO was prepared by the modified Hummer's method and characterized with XRD, FTIR, UV‐Visible spectroscopy, TGA and DLS techniques. The size of the o/w emulsion droplets stabilized by GO were determined using a polarized optical microscope. The emulsion system was used for the synthesis of 2‐aminothiazole by Hantzsch reaction. The Reactions were carried out at room temperature and under static condition, without stirring. The application of the reaction system were extended to substituted phenacyl bromides and about 93 % of the corresponding 2‐aminothiazole derivative was obtained in 3 h.
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