3-Oxa[3.3.2]propell-9-ene ( 17 ) is obtained in about 1% yield only, and thus represents the oxapropellene with the smallest carbocycle preparable by this synthetic route.doi:10.1002/cber.19771100902Klaus WeingesJohannes PillKlaus KlessingGerhard SchillingWILEY‐VCH VerlagChemische Berichte...