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HuagongsheHuagongshe Chemistry Print Report · For research reference only
HCID 587721Generated: October 25, 2026

1,3-Dimethyl-1H-pyrazole-5-carboxylic acid

1,3-DIMETHYL-1H-PYRAZOLE-5-CARBOXYLIC ACID · AKOS B013525 · AKOS PAO-0271 · BUTTPARK 37\06-96 · TIMTEC-BB SBB005425 · RARECHEM AL BO 2098 · ART-CHEM-BB B013525 · 1,3-Dimethylpyrazole-5-carboxyliccid

https://huagongshe.com/en/chemical/587721

1,3-Dimethyl-1H-pyrazole-5-carboxylic acid molecular structure

Identifiers & Physical Properties

CAS No.5744-56-9
Molecular formulaC6H8N2O2
Average molar mass140.14 g/mol
Monoisotopic mass140.0585775 g/mol
SMILESCc1cc(C(=O)O)n(C)n1
InChIKeyQRWZFUBHOQWUGH-UHFFFAOYSA-N
PubChem CID587721
ChEMBLCHEMBL2287220
EC No.673-141-4
DTXSIDDTXSID60343142

Chemical & Physical Properties

XLogP0.5
Topological polar surface area55.1
Hydrogen bond donors1
Hydrogen bond acceptors3
Rotatable bonds1
Heavy atoms10
Formal charge0
Complexity149
Melting point208-213 °C
Boiling point302.4±22.0 °C(Predicted)
Density1.28±0.1 g/cm3(Predicted)
Storage conditions2-8°C
SolubilityChloroform (Slightly, Heated), Methanol (Slightly)
Physical stateSolid
pKa (acidity coefficient)3.11±0.25(Predicted)
ColorWhite
InChI1S/C6H8N2O2/c1-4-3-5(6(9)10)8(2)7-4/h3H,1-2H3,(H,9,10)
InChIKeyQRWZFUBHOQWUGH-UHFFFAOYSA-N
SMILESCc1cc(C(O)=O)n(C)n1
CAS DataBase Reference5744-56-9(CAS DataBase Reference)
UNSPSC Code12352100
NACRESNA.22
GHS pictogramGHS07
Signal wordWarning
GHS hazard statementsH315-H319
GHS precautionary statementsP264-P280-P302+P352-P337+P313-P305+P351+P338-P362+P364-P332+P313
Hazard symbolsXi,Xn
Risk statements (R)36/37/38-22
Safety statements (S)26-36/37/39-22-24/25
UN transport number2811
Water hazard class (WGK)1
Hazard classIRRITANTAcute Tox. 4 Oral
Customs code29331990
Storage class11 - Combustible Solids

Safety & Regulations

GHS classificationWarningH302 (95.2%): Harmful if swallowed [Warning Acute toxicity, oral]P264, P270, P301+P317, P330, and P501 (click each P-code to see the statement)Aggregated GHS information provided per 42 reports by companies from 4 notifications to the ECHA C&L Inventory.
Hazard Classes and CategoriesAcute Tox. 4 (95.2%)
Water hazard class (WGK)1
UN transport number2811
Customs code29331990
Risk statements (R)36/37/38-22
Signal wordWarning
GHS pictogramGHS07
Hazard symbolsXi,Xn
Safety statements (S)26-36/37/39-22-24/25
Hazard classIRRITANTAcute Tox. 4 Oral
Storage class11 - Combustible Solids
GHS hazard statementsH315-H319
GHS precautionary statementsP264-P280-P302+P352-P337+P313-P305+P351+P338-P362+P364-P332+P313

Applications & Uses

Uses

1,3-Dimethylpyrazole-5-carboxylic acid (HL) serves as a ligand that reacts with M(OAc)2·4H2O (M = Cu or Co) in warm methanol to form the complexes [CuL2(H2O)2] and [CoL2(MeOH)4], in which the deprotonated acid coordinates to the metal ions in a monodentate fashion[3].