The first ruthenium olefin metathesis catalyst bearing a four-membered N-heterocyclic carbene ( 5 ) was synthesized and characterized by NMR spectroscopy and X-ray crystallography. The synthesis of a (carbene)carbonylrhodium complex ( 6 ) was also reported, allowing the study of the electronic properties of this new carbene ligand. The complex 5 was screened toward different olefin metathesis reactions, and it showed a slow reactivity.
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Despagnet‐Ayoub et al. (2004) studied this question.
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