Abstract
Despite the claim of the contrary, (i) the facile formation of a ring-opened cyclic peroxide from reaction of a 1,2-disubstituted benzocyclobutene with molecular oxygen has been reported before, and (ii) the analysis of the mechanistic steps of this process is incomplete, as only the symmetry-allowed conrotatory ring-opening of the benzocyclobutene has been considered. The probable involvement of biradical intermediates/biradicaloid transition states in a formally symmetry-forbidden reaction sequence has not been taken into account.
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