Reported here are some rearrangements involving the electrocyclic ringclosure of dieneynes 7. Such ringclosures are envisaged to possibly give strained substituted cyclic allenes 8 which could also behave as diradicals 8a. The results show that compounds such as 5 rearrange to cyclohexadienones 9a, 9b, or 11 through these kind of intermediates. Theoretical calculations performed on simple models