A SO3H-group anchored covalent organic framework for the synthesis of hydroxy carbamates in a single step utilizing CO2

Abstract

Currently, capturing carbon dioxide and converting it into a range of important fine chemicals has acquired more attention as CO₂ is an abundant C1 source. In the present work, the synthesis of a SO₃H-anchored covalent organic framework (COF) in a single step has been introduced. The as-synthesized COF has been characterized by PXRD, FT-IR, N₂ adsorption–desorption, TEM, SEM, etc. This SO₃H-anchored COF possesses a large surface area. Hence, the SO₃H-anchored COF can be used as a catalyst in the carbamate synthesis reaction from epoxides and amines in the presence of CO₂. This SO₃H-anchored COF has shown excellent catalytic activity with 93% yield for hydroxy carbamate formation. Again, this hydroxy carbamate formation reaction is a single-step reaction, while the as-synthesized SO₃H-anchored COF is a metal free covalent organic framework. Moreover, this SO₃H-anchored COF acts as a heterogeneous catalyst which can easily be separated out from the reaction mixture for reuse. Also, it has shown promising recyclability up to five times for this hydroxy carbamate formation reaction under mild conditions.