CATALYTIC HYDROGENATION OF CARBON DIOXIDE WITH THE CATIONIC BIS(CHELATE)RHODIUM COMPLEX [RH(P-O)(2)][BPH4]

摘要

In contrast to the mono(chelate)rhodium complex CIRh(P similar to O)((PO)-O-boolean AND) (1) ((PO)-O-boolean AND=eta(2)(O,P)-chelated Cy2PCH2CH2OCH3 ligand; P similar to O=eta(1)(P)-coordinated) the corresponding cationic bis(chelate) complex [Rh((PO)-O-boolean AND)(2)](+) (anion:BPh4-) (4) acts as an efficient catalyst for the hydrogenation of carbon dioxide to produce formic acid. Turnover numbers up to 1000 within 7 h are achieved in methanol solution at 55 degrees C. Stoichiometric reactions related to the characterization of possible reactive intermediates are also presented. [References: 17]