Abstract Gas phase thermal isomerizations of twelve acetylenic systems, all of which can in principle undergo two successive pericyclic steps, are described. The substrates, the syntheses and spectroscopic properties of which are presented, are formal derivatives of but- 2-yne, with different functional groups in the 1-and the 4-positions. The Cope, Claisen, Claisen ester, retro-ene, 1, 5-hydrogen shift, and 1, 5-homo hydrogen-shift processes ...
