Journal
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
Volume 133, Issue 18, Pages 6890-6893Publisher
AMER CHEMICAL SOC
DOI: 10.1021/ja111474v
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Funding
- Japan Society for the Promotion of Science (JSPS)
- MEXT, Japan [22000008]
- Grants-in-Aid for Scientific Research [22000008, 11J09010] Funding Source: KAKEN
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As a new class of neutral closed-shell aromatic four-membered ring systems, CoE3 (E = S, Se) was constructed inside the bowl-shaped space of pentaaryl[60] fullerene. X-ray crystallographic analysis of CoS3(eta(5)-C60Ar5) revealed that the CoS3 unit is planar, and DFT calculations suggested an aromatic 6 pi-electron system. Steric protection by the pentaaryl[60]fullerene ligand is critical for isolation and characterization of the aromatic hetero cobaltacyclobutane. Unique reactivity of the CoS3 unit was demonstrated by disruption of 6 pi-conjugation with abstraction of the sulfur atom, affording a dimer, [CoS2(eta(5)-C60Ar5)](2). This work provides new insight into the aromaticity of four-membered ring systems and advances the understanding of aromatic organometallic compounds.
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