sodium hydride in N,N,N',N',N'',N''-hexamethylphosphoric triamide 2.5 h; Ambient temperature;

potassium permanganate; Montmorillonite in nitrogen; ethyl acetate; acetonitrile

pyridine; potassium tert-butylate; Cu(I)-tert-butoxide in ethylene glycol dimethyl ether T=90°C; 1.5 h; Heating;

palladium diacetate in trifluoroacetic acid T=70°C; 1 h;

1: acetic acid; nitric acid 2: aqueous hydrochloric acid; ethanol 3: aq.-ethanolic sulfuric acid; sodium nitrite View Scheme

1: aqueous hydrochloric acid; ethanol 2: aq.-ethanolic sulfuric acid; sodium nitrite View Scheme

1: N-bromosuccinmide / water; 4-(dicyanomethylene)-2-methyl-6-(4-dimethylaminostyryl)-4H-pyran 2: acetic acid / Pt/C; palladium monocarbide / ethyl acetate; ethanol 3: potassium permanganate / Montmorillonite / ethyl acetate; acetonitrile; nitrogen View Scheme

1: potassium tert-butylate; pyridine; sodium carbonate; CuI / ethylene glycol dimethyl ether; 2-iodophenol 2: N-bromosuccinmide / water; 4-(dicyanomethylene)-2-methyl-6-(4-dimethylaminostyryl)-4H-pyran 3: acetic acid / Pt/C; palladium monocarbide / ethyl acetate; ethanol 4: potassium permanganate / Montmorillonite / ethyl acetate; acetonitrile; nitrogen View Scheme

1: acetic acid / Pt/C; palladium monocarbide / ethyl acetate; ethanol 2: potassium permanganate / Montmorillonite / ethyl acetate; acetonitrile; nitrogen View Scheme

TNM in trifluoroacetic acid T=0°C; 10 h; Irradiation-45 deg. C, also in dark; regioselectivity studied; Product distributionMechanism;