C. Pierlot et Jm. Aubry, FIRST EVIDENCE OF THE FORMATION OF 5,8-ENDOPEROXIDE FROM THE OXIDATION OF 1,4-DISUBSTITUTED NAPHTHALENE BY SINGLET OXYGEN, Chemical communications, (23), 1997, pp. 2289-2290
Bulky water-soluble 1,4-disubstituted naphthalenes react with singlet
oxygen giving the usual 1,4- and the unexpected 5,8-endoperoxides and
showing that the regioselectivity of the [4 + 2] cycloaddition of sing
let oxygen depends on the steric hindrance of the substrate.