Surface Decorated Magnetite Nanoparticles With Birhodanine and Moo2cl2(Dmf)2 As A New Magnetic Catalyst For Epoxidation of Olefins

In this work, the synthesis and characterization of a new magnetically supported mo6+ complex have been reported as a catalyst for epoxidation of olefins. for this purpose, a new silylating compound containing a birhodanine moiety, i.e. [(e)-5-(3- (3-(trimethoxysilyl)propyl)-4-oxo-2-thioxothiazolidin-5-ylidene)-3-phenethyl-2- thioxothiazolidin-4-one] (tmos-bird) has been synthesized and used for silylation of magnetite nanoparticles (mnps). the magnetically supported catalyst was then prepared by deposition of dioxomolybdenum(vi) adduct, dichlorobis(dimethylformamide) dioxomolybdenum (moo2cl2(dmf)2), on mnp@bird. the prepared supported magnetic catalyst was characterized in detail by ft-ir, transmission electron microscopy (tem), thermogravimetric analysis (tga), x-ray diffraction (xrd), vibrating sample magnetometry (vsm) and energy-dispersive x-ray (edx) analyses. cyclooctene was used as a model substrate to optimize the epoxidation reaction conditions, and the prepared magnetically retrievable catalyst was then used for epoxidation of cyclohexene, cyclooctene, styrene, indene, trans-trans-cis-1,5,9-cyclododecatrien, 1-octene, 1-heptene, α-pinene, 1-dodecene and trans-stilbene using tert-butyl hydroperoxide (tbhp) as oxidant under solvent-free conditions. the catalyst showed excellent conversion, good turn over frequency, and a short reaction time at 95 °c for epoxidation of cyclooctene.