1,2-Dihydro-1-methyl-5-(trifluoromethyl)-3H-pyrazol-3-one
[CAS# 119022-51-4]

Identification

• Name: 1,2-Dihydro-1-methyl-5-(trifluoromethyl)-3H-pyrazol-3-one
• Synonyms: 1-Methyl-5-trifluoromethylpyrazol-3-ol; 3-Hydroxy-1-methyl-5-(trifluoromethyl)-1H-pyrazole; 3-Hydroxy-1-methyl-5-trifluoromethylpyrazole; 5-(Trifluoromethyl)-3-hydroxy-1-methylpyrazole
• Molecular Formula: C₅H₅F₃N₂O
• Molecular Weight: 166.10
• CAS Registry Number: 119022-51-4
• EC Number: 622-911-8

Properties

• Solubility: Sparingly soluble (16 g/L) (25 ºC), Calc.^*
• Density: 1.423±0.06 g/cm³ (20 ºC 760 Torr), Calc.^*
• Melting point: 130.5-131 ºC^**

^* Calculated using Advanced Chemistry Development (ACD/Labs) Software V11.02 (©1994-2017 ACD/Labs)

^** Moedritzer, Kurt; EP 295233 A2 1988.

Safety Data

Hazard Classification

Hazard	Class	Category Code	Hazard Statement
Skin irritation	Skin Irrit.	2	H315
Specific target organ toxicity - single exposure	STOT SE	3	H335
Acute toxicity	Acute Tox.	3	H301
Eye irritation	Eye Irrit.	2	H319
Acute toxicity	Acute Tox.	4	H302
Acute toxicity	Acute Tox.	4	H332
Acute toxicity	Acute Tox.	4	H312
Eye irritation	Eye Irrit.	2A	H319