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HuagongsheHuagongshe Chemistry Print Report · For research reference only
HCID 4091816Generated: October 23, 2026

6,7-Dichloro-1H,3H-naphtho[1,8-cd]pyran-1,3-dione

4,5-Dichloronaphthalic anhydride · 4,5-Dichloro-1,8-Naphthalic Anhydride · 4,5-dichloronaphthalene-1,8-dicarbixylicanhydride · 6,7-Dichloro-1H,3H-naphtho[1,8-cd]pyran-1,3-dione · 1H,3H-Naphtho(1,8-cd)pyran-1,3-dione,6,7-dichloro- · 4,5-dichloronaphthalene-1,8-dicarboxylic anhydride · 4,5-Dichloro-1,8-naphthalenedicarboxylic anhydride · 4,5-Dichloronaphthalene-1,8-dicarboxylic acid anhydride

https://huagongshe.com/en/chemical/4091816

6,7-Dichloro-1H,3H-naphtho[1,8-cd]pyran-1,3-dione molecular structure

Identifiers & Physical Properties

CAS No.7267-14-3
Molecular formulaC12H4Cl2O3
Average molar mass267.06 g/mol
Monoisotopic mass265.95374935 g/mol
SMILESO=C1OC(=O)c2ccc(Cl)c3c(Cl)ccc1c23
InChIKeyFCSWROAHPQGTNM-UHFFFAOYSA-N
PubChem CID4091816
EC No.109-753-0
DTXSIDDTXSID30399212

Chemical & Physical Properties

XLogP3.8
Topological polar surface area43.4
Hydrogen bond donors0
Hydrogen bond acceptors3
Rotatable bonds0
Heavy atoms17
Formal charge0
Complexity339
SpringerMaterials PropertiesCrystal structure
Melting point337-338 °C(Solv: acetic acid (64-19-7))
Boiling point492.3±35.0 °C(Predicted)
Density1.663±0.06 g/cm3(Predicted)

Safety & Regulations

GHS classificationWarningH319 (100%): Causes serious eye irritation [Warning Serious eye damage/eye irritation]P264+P265, P280, P305+P351+P338, and P337+P317 (click each P-code to see the statement)The GHS information provided by 1 company from 1 notification to the ECHA C&L Inventory.
Hazard Classes and CategoriesEye Irrit. 2 (100%)

Applications & Uses

Uses

4,5-Dichloronaphthalene-1,8-dicarboxylic anhydride is used to produce the dye fluorescent red.