((n-Bu)4N)2S2O8 T=25°C; 3 h; Inert atmosphere; regioselective reaction;

in N,N-dimethyl-formamide T=80°C; 12 h;

1-hydroxy-2(1H)-pyridinethione HeatingIrradiation;

1: 2-lt;2-(phenylsulfonyl)ethylgt;-1,3-dioxolane With n-butyllithium in tetrahydrofuran; hexane T=-78°C; Metallation; 0.5 h; 2: cyclohexenon With benzoyl chloride in tetrahydrofuran; hexane T=-78 - 20°C; Addition; acylation; 3 h; 3: With potassium tert-butylate in tetrahydrofuran; hexane Elimination; aromatization; 3 h; Heating;