Retro-Diels–Alder decomposition of vinylallene (3) under flash-thermolysis conditions mainly gives pentatetraene (1), which is surprisingly stable; it can be purified by g.l.c. and its spectra have been recorded.
J. L. Ripoll, J. Chem. Soc., Chem. Commun., 1976, 235 DOI: 10.1039/C39760000235
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