Colorless crystal. Change color when exposed to air and light. Its solution turns brown in air. Flammable. The relative density is 1.37. Melting point: 105 ℃ (104~105 ℃). Boiling point 246 ℃ (lOOkPa). Flash point (open cup) 127 ℃. Can be sublimated. The ignition point (in a closed vessel) is 127 ℃. Dissolved in 2.3 times water, soluble in ethanol, ether, benzene, chloroform, easily soluble in pyridine and harsh alkaline solutions.
Important pharmaceutical intermediates used to produce berberine (berberine) and isoproterenol. It can also be used to produce spices (such as piperonal), dyes, photosensitive materials, electroplating materials, special inks, antioxidants, light stabilizers, preservatives, and accelerators.