Self-Supported Oligomeric Grubbs/Hoveyda-Type Ru−Carbene Complexes for Ring-Closing Metathesis

On the basis of the release−return metathesis mechanism, self-supported oligomeric Grubbs/Hoveyda-type Ru−carbene complexes have been designed and synthesized as a new type of recoverable catalyst for ring-closing metathesis. The catalytic activities of the self-supported oligomeric Ru−carbene complex in ring-closing metathesis are comparable to those of their homogeneous counterpart as they work homogeneously and are recovered heterogeneously.