The uncatalyzed 1,3-dipolar cycloaddition of ethenesulfonyl fluoride and dimethyl diazomalonate furnished a pyrazoline. Loss of molecular nitrogen during the thermal decomposition of the pyrazoline gave rise to a mixture of a cyclopropane and an isomeric alkylidene malonate. Under alkaline conditions, the CH-active alkylidene malonate dimerized with formation of a two-fold fluorosulfonyl-functionalized cyclobutane.

中文翻译：

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乙烯磺酰氟与重氮丙二酸二甲酯反应生成环丁烷

乙烯磺酰氟和重氮丙二酸二甲酯的未催化的 1,3-偶极环加成得到吡唑啉。在吡唑啉的热分解过程中分子氮的损失产生了环丙烷和异构的亚烷基丙二酸酯的混合物。在碱性条件下，CH 活性亚烷基丙二酸酯二聚化，形成双氟磺酰基官能化环丁烷。