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The acetal formation mechanism under acid-free Rh-catalyzed hydroformylation–acetalization condition has been studied using different rhodium catalyst precursors in MeOH. In the absence of added acidic co-catalyst, the acetalization is catalyzed by the H+ formed in situ under hydroformylation condition, and Rh active site on Rh-phosphine catalyst did not exhibit catalytic activity for acetalization...
Here we report a highly active and selective hydroformylation of 1-octene in ionic liquid (IL)/MeOH system based on a zwitterionic phosphine ligand bearing a lysine moiety (L(NH2)COOH). The Rh-catalyst grafted lysine in the form of ammonium salt ([Rh-L(NH3+)COOH]Tf2N) was successfully immobilized in the IL [bmim]Tf2N and recycled for seventeen times without significant loss of activity, selectivity...
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