1: 2,3-dihydro-9,10-dihydroxy-1,4-anthracenedione With sodium dithionite in water T=70 - 80°C; Inert atmosphere; 2: N-(2-aminoethyl)ethanolamine in water T=100°C; Inert atmosphere; 3: With oxygen in water T=25°C; 6 h;

1: 2,3-dihydro-9,10-dihydroxy-1,4-anthracenedione With sodium dithionite; potassium carbonate in water T=100°C; Inert atmosphere; 2: 2-(2-amino-ethoxy)-ethanol With sodium dithionite in water RefluxInert atmosphere; 3: in water T=20°C; Air;