Metathesis of Sulfur‐Containing Olefins with a Metallacyclic Aryloxo(chloro)neopentylidenetungsten Complex

Co- and self-metathesis of acyclic and unstrained sulfur-containing ligands is catalyzed by the tungsten complex 1. The catalyst is not poisoned by the sulfur-containing substituents, possibly because of the shielding of the tungsten complex and the rigidity of its coordination. The intramolecular metathesis of diallyl sulfide catalyzed by 1 provides 2,5–dihydrothiophene in 80-90% yield and ethylene.