JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, vol.135, no.22, pp.8173-8176, 2013 (SCI-Expanded)
The first stable alpha-oxyoxonium species have been synthesized and characterized. Strong donation of nonbonding electrons on oxygen into the adjacent sigma*(C-O+) orbital was predicted by modeling to result in unheard of carbon-oxygen bond lengths. The kinetic stability of the triquinane ring system provides a platform upon which to study these otherwise elusive species, which are evocative of intermediates on the acetalization reaction pathway. Crystallographic analysis of the alpha-hydroxy and alpha-methoxy oxatriquinane triflates reveals 1.658 and 1.619 angstrom C-O+ bond lengths, respectively, the former of which is a new record for the C-O bond.