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Catalyst and Ligand Degradation

The lifetime of the rhodium precatalyst depends on the rate at which the metal complex HRh(CO)(TPPTS)3 and the excess ligand TPPTS undergo decomposition. The catalyst lifetime is considerably increased by occasional addition of extra ligand. In general an increase in the reaction temperature and/or CO pressure results in a decrease in the catalyst lifetime. [Pg.95]

With 5.1 as the precatalyst, the degradation products in the propylene hy-droformylation reaction are diphenylpropyl phosphine (Ph2PC3H7), benzene, and less soluble rhodium complexes. These complexes are tentatively formulated as phosphido clusters. Formation of all the products could be rationalized by the hypothetical catalytic cycle shown in Fig. 5.6. [Pg.95]


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