252368-73-3Relevant academic research and scientific papers
New chiral diphosphinites: Synthesis of Rh complexes. Heterogenisation on zeolites
Fuerte,Iglesias,Sanchez
, p. 186 - 194 (2007/10/03)
New diphosphinite ligands derived from (2S,4R), (2S,4S)-1-benzyl-4-hydroxy-4-phenyl-2-(1,1-diphenylmethyl)pyrrolidinylmethanol and (2S,4R), (2S,4S)-1-(3-triethoxysilyl)propylaminocarbonyl-4-hydroxy-4-phenyl-2-(1,1- diphenylmethyl)pyrrolidi nylmethanol have been prepared in high yields (60-80%) and reacted with [RhCl(cod)]2 to yield cationic [Rh(diphosphinite)(cod)]+ complexes. Those metal complexes bearing a triethoxysilyl group were covalently bonded to USY-zeolite by controlled hydrolysis and Rh-heterogenised complexes were obtained. A comparative study (homogeneous versus supported) for the catalytic activity and selectivity in hydrogenation and hydroformylation reactions was made, obtaining an enhanced performance for heterogenised catalysts; moreover, those catalysts can be recycled in successive runs, by a simple filtration, without a significant loss of activity.
