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Trans-cyclooctene is isolatable at room temperature.

Trans-cycloheptene is also known at low temperature.

Ab Initio Conformational Analysis of trans-Cyclohexene (1995) says that there is spectroscopic evidence of the existence of trans-Cyclohexene, but that trans-cyclopentene hasn't been studied.

So I'm looking for any further information on trans-cyclopentene, trans-cyclobutene or trans-cyclopropene, particularly whether any of these have been theoretically calculated as (or ruled out as) corresponding to a local potential energy minimum.

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