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Updated: May 9, 2026

Preparation of 6-aminocyclohepta-2,4-dien-1-one Derivatives via Tricarbonyl(tropone)iron
Published on: August 12, 2019
Dithieno[3,4-b:3',4'-d]thiophene-annelated antiaromatic planar cyclooctatetraene with olefinic protons
Kazunari Aita1, Takeshi Ohmae, Masayoshi Takase
1Department of Chemistry, Graduate School of Science and Engineering, Tokyo Metropolitan University, Hachioji, Tokyo 192-0397, Japan.
Abstract:
The design and synthesis of a new planar cyclooctatetraene (COT) with protons directly connected to the COT ring was attained by monoannelation with dithieno[3,4-b:3',4'-d]thiophene. The planar structure of the COT core was unambiguously confirmed by X-ray crystallography. The magnetic antiaromaticity of the COT core was found to be higher than that of the previously synthesized planar COTs with olefinic protons, according to the results of (1)H NMR and absorption spectra as well as NICS calculations.
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