Modular Synthesis of 1H-lndenes, Dihydro-s-lndacene, and Diindenoindacene-a Carbon-Bridged p-Phenylenevinylene Congener

摘要

Linearly fused aromatic systems such as acenes and fluorenes are attracting much interest because of their utility in organic electronic devices. Representing a carbon-bridged phenylenevi-nylene structure, indacene derivatives are no less interesting. For instance, diindenoindacene consisting of seven rings (7 in Scheme 2) represents a methylene-bridged p-(distyryl)benzene, and this planar conjugated system may show better-defined physical properties than the parent compound, p-(distyryl)benzene. However, such a compound cannot be easily synthesized by known synthetic methods.