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HuagongsheHuagongshe Chemistry Print Report · For research reference only
HCID 88591Generated: October 23, 2026

Benzene, 1,2-dichloro-4-iodo-

1,2-DICHLORO-4-IODOBENZENE · 3,4-DICHLOROIODOBENZENE · 4-Iodo-o-dichlorobenzene · 3,4-Dichlorophenyl iodide · 1,2-dichloro-4-iodo-benzen · 3,4-Dichloro-1-iodobenzene · 3,4-Dichloroiodobenzene 99% · 3,4-Dichloroiodobenzene,98%

https://huagongshe.com/en/chemical/88591

Benzene, 1,2-dichloro-4-iodo- molecular structure

Identifiers & Physical Properties

CAS No.20555-91-3
Molecular formulaC6H3Cl2I
Average molar mass272.89 g/mol
Monoisotopic mass271.86565346 g/mol
SMILESClc1ccc(I)cc1Cl
InChIKeyNADPFZNWCQIJJW-UHFFFAOYSA-N
PubChem CID88591
EC No.243-874-0
DTXSIDDTXSID9066625

Chemical & Physical Properties

XLogP4.3
Topological polar surface area0
Hydrogen bond donors0
Hydrogen bond acceptors0
Rotatable bonds0
Heavy atoms9
Formal charge0
Complexity97.1
SpringerMaterials PropertiesNuclear quadrupole resonance spectroscopy
Melting point27-29 °C (lit.)
Boiling point116-118 °C (12 mmHg)
Density1.9882 (estimate)
Refractive index1.6480
Flash point>230 °F
Storage conditionsKeep in dark place,Sealed in dry,Room Temperature
Solubilitysoluble in Methanol
Physical statepowder to lump to clear liquid
ColorWhite or Colorless to Yellow
SensitivityLight Sensitive
BRN2245136
InChI1S/C6H3Cl2I/c7-5-2-1-4(9)3-6(5)8/h1-3H
InChIKeyNADPFZNWCQIJJW-UHFFFAOYSA-N
SMILESClc1ccc(I)cc1Cl
CAS DataBase Reference20555-91-3(CAS DataBase Reference)
FDA UNIIM6AU4ABW4L
EPA Substance Registry SystemBenzene, 1,2-dichloro-4-iodo- (20555-91-3)
UNSPSC Code12352100
NACRESNA.22
GHS pictogramGHS07
Signal wordWarning
GHS hazard statementsH315-H319-H335
GHS precautionary statementsP261-P280a-P304+P340-P305+P351+P338-P405-P501a-P264-P280-P302+P352+P332+P313+P362+P364-P305+P351+P338+P337+P313
Personal protective equipment (PPE)Eyeshields, Gloves, type N95 (US)
Hazard symbolsXi,Xn
Risk statements (R)36/37/38-20/21/22
Safety statements (S)37/39-26-36/37/39
Water hazard class (WGK)3
Hazard NoteIrritant/Light Sensitive
TSCA inventory statusTSCA listed
Customs code29039990
Storage class11 - Combustible Solids

Safety & Regulations

GHS classificationWarningH302 (68.4%): Harmful if swallowed [Warning Acute toxicity, oral]P261, P264, P264+P265, P270, P271, P280, P301+P317, P302+P352, P304+P340, P305+P351+P338, P317, P319, P321, P330, P332+P317, P337+P317, P362+P364, P403+P233, P405, and P501 (click each P-code to see the statement)Aggregated GHS information provided per 19 reports by companies from 6 notifications to the ECHA C&L Inventory. Each notification may be associated with multiple companies.
Hazard Classes and CategoriesAcute Tox. 4 (68.4%)
Personal protective equipment (PPE)Eyeshields, Gloves, type N95 (US)
Water hazard class (WGK)3
TSCA inventory statusTSCA listed
Customs code29039990
Risk statements (R)36/37/38-20/21/22
Signal wordWarning
GHS pictogramGHS07
Hazard symbolsXi,Xn
hazard_noteIrritant/Light Sensitive
Safety statements (S)37/39-26-36/37/39
Storage class11 - Combustible Solids
GHS hazard statementsH315-H319-H335
GHS precautionary statementsP261-P280a-P304+P340-P305+P351+P338-P405-P501a-P264-P280-P302+P352+P332+P313+P362+P364-P305+P351+P338+P337+P313

Applications & Uses

Uses

3,4-Dichloroiodobenzene may be used in the preparation of:tetrachloromethoxybiphenyls 1-(3,4-dichlorophenyl)-2-trimethylsilylacetylene2-(3,4-dichlorocinnamyl)isoindoline-1,3-dione

General Description

3,4-Dichloroiodobenzene undergoes Stille coupling reaction with vinyltributyltin in the presence of Pd(0)precursors to furnish styrene derivative.