3-Aryl-1-(trifluoromethyl)prop-2-yn-1-iminium triflate salts represent a novel, highly reactive class of acetylenic iminium salts. Herein we present several reactions which are based on the electron-poor acetylenic bond and on the high electrophilicity of the CF₃-substituted iminium group. These salts were found to be highly reactive dienophiles in Diels–Alder reactions with cyclopentadiene, 2,3-dimethylbutadiene and even anthracene. At higher temperature, the cycloadducts undergo an intramolecular S_E(Ar) reaction leading to condensed carbocycles incorporating a 1-(trifluoromethyl)-1-(dimethylamine)indene ring system. With styrenes and some substituted styrenes, cascade reactions take place, which likely include cyclobutene and several cationic intermediates and mainly yield 2-(1-phenylvinyl)indenes. In a similar reaction cascade, a fulvene derivative was obtained with 1,4-diphenylbutadiene as the substrate.

中文翻译：

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3-芳基-1-（三氟甲基）丙-2-炔-1-亚胺盐与1,3-二烯和苯乙烯的反应。

3-芳基-1-（三氟甲基）丙-2-炔-1-亚胺基三氟甲磺酸盐代表了一种新型的，高反应性的炔属亚胺盐。本文中，我们提出了几种基于贫电子的炔键和CF ₃取代的亚胺基的高亲电性的反应。在与环戊二烯，2，3-二甲基丁二烯甚至蒽的Diels-Alder反应中，发现这些盐是高度反应性的亲二烯体。在较高温度下，环加合物经历分子内S _E（Ar）反应导致合并了1-（三氟甲基）-1-（二甲基胺）茚环系统的稠合碳环。对于苯乙烯和一些取代的苯乙烯，会发生级联反应，其中可能包括环丁烯和几种阳离子中间体，并且主要生成2-（1-苯基乙烯基）茚。在类似的反应级联中，以1，4-二苯基丁二烯为底物获得富烯衍生物。