Entropic corrections for the evaluation of the catalytic activity in the Al(iii) catalysed formation of cyclic carbonates from CO2 and epoxides

Abstract

The reaction mechanism for formation of cyclic carbonates from CO₂ and 1,2-epoxyhexane catalyzed by an [Al(amino-triphenolate)]/NBu₄I binary system has been investigated by using density functional theory (DFT) based methods. A monometallic mechanism is proposed and the main steps of the reaction are described in detail. The energetic span model (δE) was used to theoretically determine the turnover frequencies (TOFs) of the catalytic cycle and to evaluate the efficiency of the aluminum complex in mediating the CO₂ addition reaction. Our findings indicate that entropy changes in solution must be included in order to compute the TOF values in line with the experimental results.