[Display omitted] An interesting product divergence in the reaction of trifluorodiazoethane with arylidene-1,3-indanediones is reported. The reaction conducted using 10 mol% of silver carbonate afforded trifluoromethylspiropyrazolines, while with excess of cesium fluoride in methanol, the cycloaddition was followed by nucleophilic ring opening of the spiropyrazoline to afford trifluoromethylated -carbomethoxybenzoylpyrazolines.

中文翻译：

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三氟重氮乙烷与亚芳基-1,3-茚满二酮反应中试剂和溶剂控制的产物分歧

[显示省略] 报道了三氟重氮乙烷与亚芳基-1,3-茚满二酮反应中有趣的产物分歧。使用10mol％的碳酸银进行反应，得到三氟甲基螺吡唑啉，而在甲醇中使用过量的氟化铯，环加成之后螺吡唑啉的亲核开环，得到三氟甲基化的-甲氧基苯甲酰基吡唑啉。