title: Comment on "Single-crystal X-ray structure of 1,3-dimethylcyclobutadiene by confinement in a crystalline matrix".
abstract: Legrand et al. (Reports, 16 July 2010, p. 299) reported on the photolytic reaction of an α-pyrone confined in a crystalline matrix. Their structural analysis invoked four products: activated precursor, isomeric Dewar β-lactone, and square and rectangular isomers of 1,3-dimethylcyclobutadiene. The reported x-ray data, however, suggest that all observed structures correspond to only one distinct species, the Dewar β-lactone.
authors.affiliation: Imperial College London, Department of Chemistry, London SW7 2AZ, UK. d.scheschkewitz@imperial.ac.uk
authors.forename: David
authors.initials: D
authors.lastname: Scheschkewitz