Comment on “Exploiting electronic strategies to stabilize a planar tetracoordinate carbon in cyclic aromatic hydrocarbons” by O. Yañez et al., Chem. Commun., 2017, 53, 12112†
Unequivocally, the global minimum geometry for C7H2 is the linear triplet ground electronic state of heptatriynylidene (1). However, the entitled article reports that the global minimum geometry for C7H2 is the singlet ground electronic state of 1-(buta-1,3-diynyl)cyclopropenylidene (2). We disagree with this result.