A green method for solvent-free conversion of epoxides to thiiranes using NH<sub>4</sub>SCN in the presence of NiFe<sub>2</sub>O<sub>4</sub> and MgFe<sub>2</sub>O<sub>4</sub> magnetic nanocatalysts
and applied as efficient and reusablecatalysts in the solvent-free conversion of various epoxides to the corresponding thiiranes with ammonium thiocyanate under oil bath (60°C) conditions. NiFe2O4 and MgFe2O4 nanoparticles can catalyze the reactions at short times in high to excellent yields. The catalysts can also be recovered easily using an external magnetic field and be reused four times without
Magnetically separable nano CuFe<sub>2</sub>O<sub>4</sub>: an efficient and reusable heterogeneous catalyst for the green synthesis of thiiranes from epoxides with thiourea
作者:Ronak Eisavi、Seiran Ghadernejad、Behzad Zeynizadeh、Farkhondeh Mohammad Aminzadeh
DOI:10.1080/17415993.2016.1196691
日期:2016.9.2
ABSTRACT The magnetically separable nano CuFe2O4 was prepared and used as an efficientheterogeneouscatalyst for conversion of various epoxides to the corresponding thiiranes with thiourea in refluxing ethanol. The reactions were completed within 34−45 min to give thiiranes in 80−95% yields. The utilized nano CuFe2O4 can be reused for several times without losing its activity. GRAPHICAL ABSTRACT
A simple and efficient method for the conversion of oxiranes to thiiranes using ammonium thiocyanate (NH4SCN) under solvent- and catalyst-free conditions is described. These conditions enable clean and fast conversion of oxiranes to the corresponding thiirane.