Abstract
The second generation of Grubbs type catalyst, (PCy 3)(H 2IMes)Cl 2Ru CHPh ( 1) undergoes the Cl replacement with CH 3CN to give cationic ruthenium carbene complexes, [(RCN) 3(H 2IMes)Ru CHPh](OTf) 2 ( 2, R = CH 3 ( a), Ph ( b)) in the presence of AgOTf. The reaction of 2a with H 2O in the presence of CH 3CN gives (aqua)ruthenium complex, [Ru(H 2IMes)(NCCH 3) 4(H 2O)](OTf) 2 ( 3) and benzaldehyde. Benzaldehyde is also observed in the reaction of 1 with H 2O. Plausible reaction pathways are suggested for the degradation of ruthenium benzylidenes to give benzaldehyde on the basis of the isotope labeling experiments.
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