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Cyclopropylidenetriphenylphosphorane is a phosphorane for cyclopropylidenation of aldehydes and ketones; utilized in cyclobutanone synthesis; reagent applied to polyspirane synthesis.

cyclopropylidenetriphenylphosphorane is a fairly stable ylide, capable of withstanding elevated reaction temperatures of approximately 60-65 °C. The ylide is sensitive to moisture and air and should be freshly prepared under anhydrous conditions under an inert atmosphere.