Hematin supported on Colour Catcher®: a biodegradable heterogeneous catalyst for halogen-free CO2 cycloadditions†

Abstract

This work describes the activity of biocompatible hemin derivatives in catalyzing the cycloaddition of CO₂ to epoxides and aziridines. The process sustainability was enhanced through the use of a catalytic material obtained by heterogenizing hematin onto Colour Catcher® sheets, a cellulose-based support with complete biodegradability. The material exhibited remarkable efficiency and stability, enabling consecutive use without adding additional co-catalysts, thereby enhancing the eco-tolerance of the system. The generality of the reaction was demonstrated by testing various substrates under both homogeneous and heterogeneous conditions and the reaction mechanism was suggested through DFT calculations.