P-AD-1/1的合成及催化CO2制备3-苯基-2-噁唑烷酮的研究OA

In response to the problems of harsh reaction conditions and easy solubility of catalysts in the reaction system in the traditional preparation method of oxazolidinone,we proposed the reaction of 2-bromopropene with 1,8-diazabicyclo[5.4.0]undec-7-ene(DBU)to prepare(AIDBU)Br,which was then subjected to anion exchange and imidazole modification to obtain vinyl functionalized ionic liquid(AIDBU)Im,and polymerized with divinylbenzene(DVB)to obtain heterogeneous catalyst P-AD-1/1.In order to confirm the successful synthesize of the P-AD-1/1,a series of characterizations were conducted,such as NMR,FT-IR,XRD and TGA etc.The P-AD-1/1 was then applied to the CO2-aniline-ethylene oxide cyclization reaction for the preparation of 3-phenyl-2-oxazolidinone,where the effect of the(AIDBU)Im-to-DVB ratio on catalytic activity and catalyst recyclability experiment were investigated.The results indicated that,under the optimal conditions:20 wt%catalyst,110℃,2.5 MPa,and 1 h reaction time,achieving 66.3%yield of 3-phenyl-2-oxazolidinone,the P-AD-1/1 showed good recyclability,and the yield of product could still reach 62.3%after five cycles.Furthermore,the reaction pathway of the synthesis of 3-phenyl-2-oxazolidinone from CO2-phenyl-epoxyethane was studied.This study provides experimental basis and theoretical reference for the application of ionic polymers in the preparation of 3-phenyl-2-oxazolidinone from CO2-phenyl-epoxyethane.