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HuagongsheHuagongshe Chemistry Print Report · For research reference only
HCID 19905718Generated: October 25, 2026

5-Chloropyridazin-3(2H)-one

4-chloro-1H-pyridazin-6-one · 5-CHLOR-3-PYRIDAZINON · 5-Chloropyridazin-3-ol · 5-Chloro-3(2H)-pyridazinone · 5-Chloropyridazin-3-(2H)-one · 3(2H)-Pyridazinone, 5-chloro- · 5-CHLOROPYRIDAZIN-3-OL ISO 9001：2015 REACH

https://huagongshe.com/en/chemical/19905718

5-Chloropyridazin-3(2H)-one molecular structure

Identifiers & Physical Properties

CAS No.660425-07-0
Molecular formulaC4H3ClN2O
Average molar mass130.53 g/mol
Monoisotopic mass129.9933904 g/mol
SMILESO=c1cc(Cl)cn[nH]1
InChIKeyNHMLZGFOEYLZEN-UHFFFAOYSA-N
PubChem CID19905718
ChEBICHEBI:194650
EC No.692-073-6
DTXSIDDTXSID60601178

Chemical & Physical Properties

XLogP0.1
Topological polar surface area41.5
Hydrogen bond donors1
Hydrogen bond acceptors2
Rotatable bonds0
Heavy atoms8
Formal charge0
Complexity173
Density1.55
Storage conditions2-8°C
pKa (acidity coefficient)10.06±0.40(Predicted)
AppearanceOff-white to yellow Solid
GHS pictogramGHS07
Signal wordWarning
GHS hazard statementsH302-H315-H319-H335
GHS precautionary statementsP261-P305+P351+P338
Risk statements (R)20/21/22-36/37/38
Safety statements (S)22-26-36/37/39
Customs code2933998090

Safety & Regulations

Customs code2933998090
Risk statements (R)20/21/22-36/37/38
Signal wordWarning
GHS pictogramGHS07
Safety statements (S)22-26-36/37/39
GHS hazard statementsH302-H315-H319-H335
GHS precautionary statementsP261-P305+P351+P338

Applications & Uses

Uses

5-Chloropyridazin-3(2H)-one is used in preparation of 1,5,6,7-tetrahydro-4H-pyrazolo[4,3-c]pyridin-4-one compounds as GPR52 modulator compounds.