Abstract
Abstract The monomer-dimer equilibrium of RhCl(PPh3)3 in benzene has been studied with a stopped-flow apparatus under He gas pressure. The decomposition rate of a dimer, [RhCl(PPh3)2]2, obeys pseudo-first-order kinetics with respect to the concentration of PPh3, whereas the formation rate of a dimer obtained by diluting an equilibrium solution with benzene depends on the equilibrium concentration of a monomer, a dimer and PPh3 in a complexed manner. The kinetic results are consistent with the following mechanism; 2RhCl(PPh3)3\ightleftarrowsRhCl(PPh3)2+RhCl(PPh3)3+PPh3\ightleftarrows[RhCl(PPh3)2]2+2PPh3.
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