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Rhenium-Catalyzed C[BOND]H and C[BOND]C Bond Activation

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Making rings: The Re-catalyzed insertion of phenylacetylene into cyclic 1,3-keto esters to give medium-sized-ring compounds is discussed in context. The rhenium catalyst promises to be more general since it is required in low amounts and reacts under mild conditions with nonstrained substrates.

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