... H,, Pd(C), 100%. CLAH, Et,O, 90%. ... Eventually, it was found that Fremy's salt oxidized phenol 31 cleanly to o-quinone 32, mp 174-177 OC , unconta- minated by the desired para isomer. ... (19) Cf. McRobbie, I. M.; Meth-Cohn, 0.; Suschitzsky, H. Tetrahedron 1986, 27, 5541. Lett. ...