manganese(IV) oxide; p-benozquinone; palladium diacetate
T=40°C; 48 h; Yield given. Yields of byproduct given. Title compound not separated from byproducts;
Piaux
Comptes Rendus Hebdomadaires des Seances de l'Academie des Sciences, 1934 , vol. 199, p. 1127
Annales de Chimie (Cachan, France), 1935 , vol. <11> 4, p. 147,211