copper(I) bromide in diethyl ether T=0°C; 2 h; Yields of byproduct given;

bis-triphenylphosphine-palladium(II) chloride; 2,2'-bibenzo[d]oxazole; p-benozquinone; lithium tert-butylate in 1,4-dioxane T=100°C; 8 h; Inert atmosphere; regioselective reaction;

sodium hydrogen sulphate T=200°C; P=1.5 Torr;

1: Al, HgCl2 / ethanol; benzene 2: NaHSO4 / 200 °C / 1.5 Torr View Scheme