1-Hydroxy-1H-pyrazole
[CAS# 81945-73-5]

Identification

• Name: 1-Hydroxy-1H-pyrazole
• Synonyms: 1-Hydroxypyrazole; 1H-Pyrazol-1-ol; N-Hydroxypyrazole; Pyrazol-1-ol
• Molecular Formula: C₃H₄N₂O
• Molecular Weight: 84.08
• CAS Registry Number: 81945-73-5
• EC Number: 279-854-3

Properties

• Solubility: Soluble (84.9 g/L) (25 ºC), Calc.^*
• Density: 1.30±0.1 g/cm³ (20 ºC 760 Torr), Calc.^*
• Melting point: 74 ºC^**
• Boiling point: 242.3±23.0 ºC (760 Torr), Calc.^*
• Flash point: 100.3±22.6 ºC, Calc.^*

^* Calculated using Advanced Chemistry Development (ACD/Labs) Software V11.02 (©1994-2014 ACD/Labs)

^** Baus, Ulf; DE 3820738 A1 1989.

Safety Data

Hazard Classification

Hazard	Class	Category Code	Hazard Statement
Specific target organ toxicity - single exposure	STOT SE	3	H335
Skin irritation	Skin Irrit.	2	H315
Acute toxicity	Acute Tox.	4	H302
Eye irritation	Eye Irrit.	2A	H319