|Density 1.46 g/cm³|
|Boiling point 489.3 °C|
Derivatives of 1,9-pyrazoloanthrone have a variety of biological activities. For example, 5-(aminoalkyl)amino derivatives have been investigated as anticancer agents.
1,9-Pyrazoloanthrone can be synthesized by the condensation of 2-chloroanthraquinone with anhydrous hydrazine in pyridine at 100 °C. Purification is achieved via conversion to the N-acetyl derivative which is crystallized from acetic acid, followed by hydrolysis of the acetyl group with ammonium hydroxide in methanol.