Cyclohexanone catalysts, ruthenium complexes

A cationic half-sandwich complex of ruthenium containing a l-(2-methylpyridine)phosphole as ligand (Fig. 64) is a very efficient catalyst for the transfer hydrogenation of cyclic ketones such as cyclohexanone and syn-2,5-dimethyl cyclohexanone, as well as acetophenone, benzophenone, and 2-acetylpyrodine, in basic 2-propanol. TOFs in the 1.03x 10 to 1.33x 10 h range, at complete conversion, were achieved (268). 

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