No abstract

A thermoregulated ionic liquid and organic biphasic system composed of quaternary ammonium-based ionic liquid N,N-dimethyl-N-(2-(2-methoxyethoxy)ethyl)-N-(2-(2-octyloxyethoxy)ethyl) ammonium methanesulfonate (1) and cyclohexane was first applied for the Rh nanoparticle catalyzed hydroformylation of olefins, which allows for not only a highly efficient homogeneous catalytic reaction, but also an easy separation and reuse of catalyst. Under the optimized conditions, various olefins could be converted completely with C98 % selectivity for aldehydes. After reaction, the Rh nanoparticle catalyst could be recovered by simple phase separation and reused for five times without evident loss of activity.

Rh nanoparticles were investigated as a catalyst for hydroformylation of olefins in thermoregulated ionic liquid/organic biphasic systems composed of an ionic liquid, namely [CH 3 (OCH 2 CH 2 ) 16 N + Et 3 ][CH 3 SO 3 − ] (IL PEG750 ), and an organic solvent. This enables not only a homogeneous reaction but also easy biphasic separation. Under the optimized reaction conditions, the conversion of 1-octene and yield of aldehyde were 99% and 91%, respectively. The catalyst was easily separated from the product by phase separation and used eight times without evident loss of activity.