title: Comment on "trans-1,2-Disiloxybenzocyclobutene, an adequate partner for the auto-oxidation: EPR/spin trapping and theoretical studies" by J. Drujon et al., Phys. Chem. Chem. Phys., 2014, 16, 7513.
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.
authors.affiliation: Institut für Organische Chemie, Universität Duisburg-Essen, 45117 Essen, Germany. hans-gert.korth@uni-due.de.
authors.forename: Hans-Gert
authors.initials: HG
authors.lastname: Korth
authors.affiliation: Leiden Institute of Chemistry, Leiden University, 2300 RA Leiden, The Netherlands.
authors.forename: Peter
authors.initials: P
authors.lastname: Mulder
authors.affiliation: Heidelberger Druckmaschinen AG, 69115 Heidelberg, Germany.
authors.forename: Thomas
authors.initials: T
authors.lastname: Paul