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Efficient and Recyclable Cobalt(II)/Ionic Liquid Catalytic System for CO 2 Conversion to Prepare 2‐Oxazolinones at Atmospheric Pressure
Author(s) -
Zhou ZhiHua,
Chen KaiHong,
He LiangNian
Publication year - 2019
Publication title -
chinese journal of chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.28
H-Index - 41
eISSN - 1614-7065
pISSN - 1001-604X
DOI - 10.1002/cjoc.201900346
Subject(s) - chemistry , cobalt , ionic liquid , catalysis , atmospheric pressure , amine gas treating , ionic bonding , combinatorial chemistry , chemical engineering , organic chemistry , ion , oceanography , engineering , geology
Summary of main observation and conclusion Converting CO 2 into value‐added chemicals represents a promising way to alleviate the CO 2 derived environmental issues, for which the development of catalysts with high efficiency and recyclability is very desirable. Herein, the catalytic system by combining cobalt source and ionic liquid (IL) has been developed as the efficacious and recyclable catalyst for the carboxylative cyclization of propargylic amine and CO 2 to prepare 2‐oxazolinones. In this protocol, various propargylic amines were successfully transformed into the corresponding 2‐oxazolinones with CoBr 2 and diethylimidazolium acetate ([EEIM][OAc]) as the catalyst under atmospheric CO 2 pressure. It is worth noting that the turnover number (TON) of this transformation can be up to 1740, presumably being attributed to the cooperative effect of the cobalt and IL. Furthermore, the existence of IL enables the catalytic system to be easily recycled to 10 times without losing its activity.