Combine 13 g of 3-nitrophthalic acid, 20 mL of 20% aqueous hydrazine sulfate solution and 40 mL of triethylene glycol, boil until all of the water comes off. Then place the solution in a hot oil bath and heat it at 160-170°C for 3h. After the mixture has cooled down, add 45 mL of water and stir for 30 minutes. Filter, and wash with 50 mL of water, dry and recrystallize in hot ethanol.
All of the chemicals combined, boiling off the water with stirring
The mixture after heating for 3h in an oil bath
Water was added to the mixture and it was stirred
The product after washing, filtration and drying