Abstract
Chemical fixation of CO2 and synthesis of organic carbamates through phosgene –free eco-friendly pathway using a heterogeneous and sustainable catalyst is always a demanding field in synthesis chemistry. Herein, we presented the design and synthesis of a polymer support sustainable heterogeneous [PS-Zn(II)L] catalyst from modified chloromethylated polystyrene. The heterogeneous catalyst has been characterized by IR, PXRD, AAS, TG-DTA, SEM and EDX studies. The catalyst showed its efficient catalytic activity towards the formation of organic cyclic carbonate from epoxides via CO2 fixation at room temperature under 1 atm CO2 pressure in solvent free condition and production of organic carbamates from corresponding amines. The synthesis of carbamates in presence of this catalyst is a phosgene-free protocol where green reagent Dimethyl carbonate (DMC) is used as a carboxylating agent as well as the solvent. The catalyst is highly efficient and reusable even after five cycles.
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