The effective synthesis of propylene carbonate catalyzed by silica-supported hexaalkylguanidinium chloride

We have described that both homogeneous and a silica- supported hexaalkylguanidinium chloride were effective catalysts for CO2 fixation to carbonate without any solvent under mild reaction conditions ( 4.5 MPa, 120 degrees C, 4 h), the silica- supported hexaalkylguanidinium chloride showing the great advantage that it could be recycled easily at least 5 further times without any obvious decrease in its catalytic activity, after simple filtration.