sodium azide; Aliquatreg; 336 in water T=60°C; 8.5 h;

hydrogenchloride; hydroquinone; rhenium heptasulfide T=80°C; 1.5 h; hydroquinone or hydroquinone methyl ether, Re2S7, 80 deg C, 91 h;

hydroquinone or hydroquinone methyl ether; sodium acetate; rhenium heptasulfide T=80°C; 38 h; hydroquinone or hydroquinone methyl ether, Re2S7, 80 deg C, 91 h;