4-Methyl-2,6,7-trioxabicyclo[2,2,2]octane: a convenient ring current probe
Abstract
1 H N.m.r. absorptions of the title bicyclic polar molecule undergo pronounced upfield and downfield shifts in the proximity of the shielding cone and deshielding torus, respectively, of carbocyclic and heterocyclic molecules possessing a ring current.