Synthesis, Structure, and Photophysical Properties of Highly Substituted 8,8a‐Dihydrocyclopenta[<i>a</i>]indenes

Abstract

A triple round: A palladium-catalyzed cyclotrimerization of 1,2-diarylacetylenes has been developed to synthesize highly substituted 8,8a-dihydrocyclopenta[a]indenes. One such cycloadduct (1) displays unusual aggregation-induced emission with a strong blue fluorescence (see picture). The structures of the products have been confirmed by X-ray crystal analysis.