雙芳香基炔類24於鈀金屬錯合物催化下，加入還原劑三環己基磷，氧化劑醋酸銅、苯琨，在乙腈和水的雙溶劑系統下可進行不尋常的三聚合環化反應而得到多取代8,8a-雙氫環戊[a]茚(25)，其結構已經由X-ray單晶分析獲得確認。數種鈀錯合物的催化效能、磷化物的反應性、添加物的影響等已被測試。合成反-1,2,3,8,8a-五苯基-8,8a-雙氫環戊[a]茚(25)的反應條件已調整至最佳化使產率可達68%。依據此合成方法，12種多取代8,8a-雙氫環戊[a]茚衍生物已被製備，產率為37-85%。
由3,3'-雙取代雙芳香基炔，1,2-雙(3-甲氧基苯基)乙炔(24f)和1,2-雙(3-甲苯基)乙炔(24k)所進行的異常三聚合反應，發現此反應具有位向特異性，僅產生單一環化產物，且其三環產物(8β,8aα)-1,2,3,8,8a-五(3-甲氧基苯基)-5-甲氧基-8,8a-雙氫環戊[a]茚(25f)和(8β,8aα)-5-甲基-1,2,3,8,8a-五(3-甲苯基)-8,8a-雙氫環戊[a]茚(25k)的立體結構利用二維核磁共振光譜而求得。
三環產物反-1,2,3,8,8a-五苯基-8,8a-環戊[a]茚(25a)，其一系列的光物理性質已被測定，發現它含有不尋常的光物理性質，聚集誘發放光。

8,8a-Dihydrocyclopenta[a]indenes (25) can be prepared from the unusual cyclotrimerization of diarylethynes 24 in the presence of the palladium catalyst, tricyclohexylphosphine, cupric acetate, benzoquinone, water and acetonitrile. The structures of cycloadducts have been confirmed by X-ray crystal analyses.
Several palladium complexes and additives have been examined. The reaction conditions for the preparation of trans-1,2,3,8,8a-pentaphenyl-8,8a-
dihydrocyclopenta[a]indene (25a) has been optimized and 25a was obtained in 68% yield. Based on this procedure, twelve examples of highly substituted 8,8a-dihydrocyclopenta[a]indenes have been prepared in 37-85% yields.
3,3'-Disubstituted diarylethynes, i.e. 1,2-bis(3-methoxyphenyl)ethyne (24f) and 1,2-bis(3-tolyl)ethyne (24k), generated corresponding cycloadducts 25. Base on the information provided by 2D-NMR spectra, their structures regiospecifically have been revealed.
In addition, tricyclic adduct 25a displays an unusual aggregation-induced emission with blue fluorescence.

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