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二氯卡宾与四苯基环戊二烯酮（1）反应放出CO，并生成偕二卤化物（3）、二氯环氧乙烷（4）以及双键加成物（5）．羰基叶立德的芳香性结构及其“中介型”构象决定了该反应以脱CO为主，电环化途径次之．
Dichlorocarbene reacts with tetraphenylcyclopentadienone (1) to give CO and generate geminal dihalide (3), dichloroethylene oxide (4) and double bond adduct (5). The aromatic structure of carbonyl ylide and its “intermediary” conformation determine that the reaction is dominated by CO removal, followed by the electrocyclo-cyclization pathway.