Figure 6.

Free energies and enthalpies (in parenthesis) of the reaction of ruthenium methylidene complexes with cis-2-butene catalyzed by (a) catalyst 2 and (b) catalyst 3. These are the rate-determining steps in the ethenolysis of internal olefins. All energies are with respect to the ruthenium ethylidene complexes (37 and 41, see Figure 4) and are given in kcal/mol. See Figure 2 for the reaction catalyzed by catalyst 5.