2-Methyl-2,4-dihydropyrazol-3-one
[CAS# 10234-66-9]

Identification

• Name: 2-Methyl-2,4-dihydropyrazol-3-one
• Synonyms: 1-Methyl-2-pyrazolin-5-one; 1-Methyl-5-pyrazolone
• Molecular Formula: C₄H₆N₂O
• Molecular Weight: 98.10
• CAS Registry Number: 10234-66-9
• EC Number: 864-885-2

Properties

• Solubility: Freely soluble (264 g/L) (25 °C), Calc.^*
• Density: 1.22±0.1 g/cm³ (20 °C 760 Torr), Calc.^*
• Melting point: 112-114 °C^**
• Boiling point: 136.9±23.0 °C (760 Torr), Calc.^*
• Flash point: 36.6±22.6 °C, Calc.^*

^* Calculated using Advanced Chemistry Development (ACD/Labs) Software V11.02 (©1994-2015 ACD/Labs)

^** Baba, Masatoshi

Safety Data

Hazard Classification

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