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Ring Contraction of Metallacyclobutadiene to Metallacyclopropene Driven by π- and σ-Aromaticity Relay
[post]
2022
unpublished
π-Aromaticity is an important driving force in directing the synthesis of aromatic compounds; in contrast, reactions induced by σ-aromaticity are uncommon. Herein, we report a strategy based on π- and σ-aromaticity relays to realize the first structurally defined ring contraction of metallacyclobutadiene to metallacyclopropene. This reaction involves the release of the π-antiaromaticity of metallacyclobutadiene in 2a to afford a π-aromatic intermediate (4A), followed by ring reclosure to
doi:10.21203/rs.3.rs-1276399/v1
fatcat:7ttfb7kv4rg3biq7ywm7ioeku4