1: With palladium 10 on activated carbon; hydrogen; triethylamine in ethanol T=20°C; P=775.743 Torr; 4 h; 2: in anhydrous xylene 3 h; Reflux;

1: in chloroform T=35°C; 4 h; 2: With 3,3,3′,3′-tetramethyl-1,1′-spirobis(indane-5,5′,6,6′-tetrol); oxygen; potassium carbonate in chloroform; water T=35°C; P=760.051 Torr; 16 h;

1.1: N,N-dimethyl-formamide; thionyl chloride / chloroform / 4.5 h / |Reflux 2.1: triethylamine; palladium 10 on activated carbon; hydrogen / ethanol / 4 h / 20 °C / 775.74 Torr 2.2: 3 h / |Reflux View Scheme