Abstract
Olefin metathesis gives access to important petrochemicals, polymers, and pharmaceuticals. The catalysts for these transformations are often based on high-valent metal ions e.g., Ru(IV), which have been improved through ligand modifications. An attractive, but challenging goal is to catalyze olefin metathesis with a non-toxic, bio-compatible, and abundant element; namely, iron. Indeed, the first pieces of evidence suggest that low-valent Fe(II) complexes are active in olefin metathesis. This Review by K. Meyer, S. B. Tsogoeva, et al. (DOI: 10.1002/chem.202201414) summarizes the key advances and challenges in this endeavor.
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