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HuagongsheHuagongshe Chemistry Print Report · For research reference only
HCID 673686Generated: October 23, 2026

4-Bromo-1-methyl-1H-pyrazole-5-carboxylic acid

4-bromo-1-methylpyrazole-3-carboxy acid · 1-Methyl-4-bromopyrazole-5-carboxylic acid · 4-bromo-2-methyl-3-pyrazolecarboxylic acid · 4-Bromo-2-methylpyrazole-3-carboxylic acid · 4-Bromo-1-methylpyrazole-5-carboxylic Acid · 1H-Pyrazole-5-carboxylic acid, 4-bromo-1-methyl- · 4-bromo-1-methyl-1H-pyrazole-5-carboxylic acid(SALTDATA: FREE)

https://huagongshe.com/en/chemical/673686

4-Bromo-1-methyl-1H-pyrazole-5-carboxylic acid molecular structure

Identifiers & Physical Properties

CAS No.84547-84-2
Molecular formulaC5H5BrN2O2
Average molar mass205.01 g/mol
Monoisotopic mass203.95344 g/mol
SMILESCn1ncc(Br)c1C(=O)O
InChIKeyYXIJCAVZGBGUKM-UHFFFAOYSA-N
PubChem CID673686
ChEMBLCHEMBL1899934
EC No.673-169-7
DTXSIDDTXSID00350097

Chemical & Physical Properties

XLogP0.8
Topological polar surface area55.1
Hydrogen bond donors1
Hydrogen bond acceptors3
Rotatable bonds1
Heavy atoms10
Formal charge0
Complexity153
Melting point235-236 °C
Boiling point347.4±27.0 °C(Predicted)
Density1.93±0.1 g/cm3(Predicted)
Storage conditions2-8°C
pKa (acidity coefficient)1.75±0.37(Predicted)
AppearanceWhite to off-white Solid
GHS pictogramGHS07
Signal wordWarning
GHS hazard statementsH302-H315-H319-H335
GHS precautionary statementsP261-P305+P351+P338
Hazard classIRRITANT

Safety & Regulations

GHS classificationWarningH315 (100%): Causes skin irritation [Warning Skin corrosion/irritation]H319 (100%): Causes serious eye irritation [Warning Serious eye damage/eye irritation]H335 (100%): May cause respiratory irritation [Warning Specific target organ toxicity, single exposureRespiratory tract irritation]P261, P264, P264+P265, P271, P280, P302+P352, P304+P340, P305+P351+P338, P319, P321, P332+P317, P337+P317, P362+P364, P403+P233, P405, and P501 (click each P-code to see the statement)Aggregated GHS information provided per 3 reports by companies from 3 notifications to the ECHA C&L Inventory. Each notification may be associated with multiple companies.Information may vary between notifications depending on impurities, additives, and other factors. The percentage value in parenthesis indicates the notified classification ratio from companies that provide hazard codes. Only hazard codes with percentage values above 10% are shown. For more detailed information, please visit ECHA C&L website.
Hazard Classes and CategoriesSkin Irrit. 2 (100%)Eye Irrit. 2A (100%)STOT SE 3 (100%)
Signal wordWarning
GHS pictogramGHS07
Hazard classIRRITANT
GHS hazard statementsH302-H315-H319-H335
GHS precautionary statementsP261-P305+P351+P338