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ChEBI: A cycloalkene that consists of cyclopropane having a double bond in the ring. The parent of the class of cyclopropenes.

Cyclopropene can be synthesized as follows: Prepare a solution of cyclopropene in toluene by treating a solution of allyl chloride in toluene at reflux with sodium bis(trimethylsilyl)amide and trapping the gas in toluene at -78 °C.

[1] Iolanda Marchueta. “Intermolecular Pauson−Khand Reactions of Cyclopropene: A General Synthesis of Cyclopentanones.” Organic Letters 3 20 (2001): 3193–3196.