lsyc_a_1339802_sm2920.docx (688.95 kB)
Amino acids/superbases as eco-friendly catalyst system for the synthesis of cyclic carbonates under metal-free and halide-free conditions
Version 2 2018-03-07, 21:55
Version 1 2017-12-18, 19:02
journal contribution
posted on 2018-03-07, 21:55 authored by Yaqiong Qi, Weiguo Cheng, Fei Xu, Shengli Chen, Suojiang ZhangAn eco-friendly and efficient binary catalyst system of superbases and amino acids was developed for the synthesis of cyclic carbonates from epoxides and CO2 under metal-free and halide-free conditions. Among the various amino acids and superbases systems tested, the L-histidine/1,8-diazabicyclo[5.4.0]-undec-7-ene (DBU) system achieved the highest conversion of propylene oxide and selectivity of propylene carbonate. The effect of various reaction parameters was evaluated. A possible catalyst mechanism for L-histidine synergized with DBU in the ring opening of epoxide and DBU introduced CO2 activation. The process herein represents a green, simple, and cost-effective route for the chemical fixation of CO2 into cyclic carbonates.