Ultrasound promoted rapid and green synthesis of thiiranes from epoxides in water catalyzed by chitosan-silica sulfate nano hybrid (CSSNH) as a green, novel and highly proficient heterogeneous nano catalyst.

The synthesis and characterization of chitosan-silica sulfate nano hybrid (CSSNH) as a novel, green and highly efficient heterogeneous nano catalyst is described. The catalytic activity of this new biopolymeric nano catalyst was investigated in the ultrasonic assisted green synthesis of structurally diverse thiiranes from epoxides using thiourea in water at room temperature. CSSNH was characterized using some different microscopic and spectroscopic techniques such as scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD), N2 adsorption isotherm, Fourier transform infrared spectroscopy (FT-IR), and thermogravimetric analysis (TGA). The green nature, cheapness, efficiency, ease of preparation, handling and reusability of this new catalyst makes this catalyst to be useful for green industrial processes.