Back
HuagongsheHuagongshe Chemistry Print Report · For research reference only
HCID 713937Generated: October 23, 2026

4-Oxo-4,5,6,7-tetrahydro-1-benzofuran-3-carboxylic acid

AKOS BBS-00000134 · BUTTPARK 29\08-32 · IFLAB-BB F1901-0074 · 4 5 6 7-TETRAHYDRO-4-OXOBENZOFURAN-3- & · 4,5,6,7-Tetrahydro-4-oxobenzofuran-3-caroxylic acid · 4,5,6,7-tetrahydro-4-oxo-3-benzofurancarboxylicacid · 4-OXO-4,5,6,7-TETRAHYDROCOUMARONE-3-CARBOXYLIC ACID · 4-oxo-6,7-dihydro-5H-1-benzofuran-3-carboxylic acid

https://huagongshe.com/en/chemical/713937

4-Oxo-4,5,6,7-tetrahydro-1-benzofuran-3-carboxylic acid molecular structure

Identifiers & Physical Properties

CAS No.56671-28-4
Molecular formulaC9H8O4
Average molar mass180.16 g/mol
Monoisotopic mass180.04225874 g/mol
SMILESO=C(O)c1coc2c1C(=O)CCC2
InChIKeyFABBWECRHZNMDQ-UHFFFAOYSA-N
PubChem CID713937
ChEBICHEBI:183334
EC No.637-192-6
DTXSIDDTXSID80351926

Chemical & Physical Properties

XLogP0.6
Topological polar surface area67.5
Hydrogen bond donors1
Hydrogen bond acceptors4
Rotatable bonds1
Heavy atoms13
Formal charge0
Complexity248
Melting point140 °C
Boiling point383.5±42.0 °C(Predicted)
Density1.406±0.06 g/cm3(Predicted)
Storage conditions2-8°C
pKa (acidity coefficient)3.74±0.20(Predicted)
AppearanceOff-white to yellow Solid
CAS DataBase Reference56671-28-4
GHS pictogramGHS05
Signal wordDanger
GHS hazard statementsH314-H318
GHS precautionary statementsP280-P305+P351+P338-P310
Hazard symbolsC
Risk statements (R)36/37/38
Safety statements (S)26-36/37/39
Hazard NoteCorrosive
Hazard classIRRITANT
Customs code2932990090

Safety & Regulations

GHS classificationWarningH315 (100%): Causes skin irritation [Warning Skin corrosion/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 38 reports by companies from 1 notifications to the ECHA C&L Inventory. Each notification may be associated with multiple companies.
Hazard Classes and CategoriesSkin Irrit. 2 (100%)
Customs code2932990090
Risk statements (R)36/37/38
Signal wordDanger
GHS pictogramGHS05
Hazard symbolsC
hazard_noteCorrosive
Safety statements (S)26-36/37/39
Hazard classIRRITANT
GHS hazard statementsH314-H318
GHS precautionary statementsP280-P305+P351+P338-P310

Applications & Uses

Uses

4-Oxo-4,5,6,7-tetrahydrobenzo[b]furan-3-carboxylic acid can be used as an intermediate of Propala.