Application of a novel phosphonic-functionalized polyether imidazolium ionic liquid in hydroformylation of 1-octene

Abstract

In this paper, based on the concept of integration of phosphine ligands and ionic liquids, a new phosphine-functionalized polyether imidazolium ionic liquid [Ph(EO)16MIM]3[P(m-C6H4SO3)3] was designed and synthesized. The phosphine-functionalized ionic liquids have the characteristics of both phosphine ligands and ionic liquids. They can be used not only as ligands to complex metal rhodium, but also as catalyst supports. Based on this unique property, we constructed a Rh-[Ph(EO)16MIM]3[P(m-C6H4SO3)3] biphasic catalytic system to catalyze the hydroformylation of 1-octene. The results show that the catalyst is not only easy to separate and recover, but also can obtain 2717 h−1 TOF value within 0.5 h. When the catalyst was reused for 15 times, there was no obvious deactivation of the catalyst, and the total conversion number TTON was as high as 43288.