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On the basis of our current results we cannot exclude that in intermediate IX the dehydrogenated substrate has dissociated, after protonation, from the Ru catalyst before the retro-aldol reaction takes place. However, since retro-aldol reactions are well-known to be catalyzed by a base and thus occur readily from sodium alkoxides, it seems more likely that the retro-aldol step proceeds from the ruthenium alkoxide than from the hydroxy derivative, that is, when the substrate is still coordinated to the Ru catalyst
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On the basis of our current results we cannot exclude that in intermediate IX the dehydrogenated substrate has dissociated, after protonation, from the Ru catalyst before the retro-aldol reaction takes place. However, since retro-aldol reactions are well-known to be catalyzed by a base and thus occur readily from sodium alkoxides (, S. Searlies Jr., E. K. Ives, S. Nukina, J. Org. Chem. 1959, 24, 1770), it seems more likely that the retro-aldol step proceeds from the ruthenium alkoxide than from the hydroxy derivative, that is, when the substrate is still coordinated to the Ru catalyst.
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