Extreme Oxatriquinanes: Structural Characterization of α-Oxyoxonium Species with Extraordinarily Long Carbon–Oxygen Bonds
作者:Gorkem Gunbas、William L. Sheppard、James C. Fettinger、Marilyn M. Olmstead、Mark Mascal
DOI:10.1021/ja4032715
日期:2013.6.5
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.