Abstract
Our recent studies on catalytic reactions via ruthenium-allenylidene complexes are reviewed from the viewpoint of organic synthesis. Thiolate-bridged diruthenium complexes work as efficient catalysts to promote a variety of novel organic transformations, especially propargylic substituion reactions, via allenylidene complexes as key intermediates. The asymmetric version of these reactions is also described together with some mononuclear ruthenium complex-catalyzed related reactions by other groups.
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