Liquid-phase epoxidation of propylene with molecular oxygen by chloride manganese meso-tetraphenylporphyrins

Propylene molecule owns two active sites, the direct epoxidation of propylene by dioxygen is still a chal-lenge due to the limitation of selectivity. In this work, the direct liquid-phase propylene aerobic epoxida-tion protocol by chloride manganese meso-tetraphenylporphyrin (MnTPPCl) was developed. The conversion of propylene was 12.7%, and the selectivity towards PO (propylene oxide) reached up to 80.5%. The formation of PO was attributed to the mechanism via high-valent Mn species, which was con-firmed by means of in situ UV-vis spectrum. (c) 2021 Chemical Industry and Engineering Society of China, and Chemical Industry Press Co., Ltd. All rights reserved.