Abstract
This review recapitulates current progress in the synthesis of unsupported (US) and polymer-supported (PS) first row transition metal (Tm) Schiff base complexes and their catalytic activities for epoxidation of alkenes. PSTm complexes have shown higher activity with respect to their unsupported analogs. The polymer-supported Schiff base complexes of V, Mn, Fe, Co, Ni, Cu, and Zn ions were used as catalysts for epoxidation of different alkenes such as limonene, cyclohexene, styrene, cis-stilbene, trans-stilbene, verbenone, linear alkene, cyclooctene, α-methyl styrene and α-pinene. The activity of PSTm supported by diversified Schiff bases and different types of oxidants were studied and are presented in this review. In addition to this, recyclability of PSTm and unsupported Schiff base 3d transition metal complexes were also presented for more clarity about the complexes. Based on the literature reported, the mechanism of epoxidation has been given. This review about polymer-supported first-row transition metal complexes towards epoxidation of alkenes will be very useful to the material as well as catalytic researchers for its uniqueness in comparison to unsupported catalysts as well as with metals of the periodic table. Finally, challenges and opportunities are given for future study.
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