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Fe3O4@Silica Sulfuric Acid Nanoparticles as a Magnetically Recoverable Solid Acid Catalyst for the Synthesis of 2,3-Dihydroquinazolin-4(1H)-ones

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Figure

Fig. 1. FT-IR spectra of the bare Fe 3 O 4  (a), Fe 3 O 4 @SiO 2  (b) and Fe 3 O 4 @SiO 2 -SO 3 H nanoparticles
Fig. 4. XRD pattern of Fe 3 O 4 @SiO 2 -SO 3 H nanoparticles.

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