Intermolecular Carbene–Carbene Coupling of a Nucleophilic Vinylidene and an Electrophilic 1‐Methoxyethylidene Ligand

The first example of an intermolecular carbene–carbene coupling reaction between a Fischer and a Schrock carbene ligand is achieved by coupling of the vinylidene fragment in 1 with the methoxyethylidene ligand in 2. In the resulting red titanacyclic chromium carbene complex 3 the chromium is coordinated in such a way by the methoxy substituent that the bicyclic framework is virtually planar.