3,5-Dichloro-4-iodopyridine

Also known as: 3,5-Dichloro-4-iodo-pyridine, Pyridine, 3,5-dichloro-4-iodo-, 3,5-Dichlor-4-jod-pyridin

3,5-Dichloro-4-iodopyridine (CAS 343781-41-9) is a compound in the Pharma Intermediates category listed in the Jingsj chemical database. It has the molecular formula C5H2Cl2IN and a molecular weight of 273.887 g/mol. Key properties include a melting point of 186-190ºC(lit.), a boiling point of 271.6±35.0 °C at 760 mmHg, a density of 2.1±0.1 g/cm3 and a flash point of 118.1±25.9 °C. It is classified under GHS with signal word Danger and hazard statements H302 — Harmful if swallowed, H315 — Causes skin irritation and H318 — Causes serious eye damage. No supplier offers are currently listed; request a quote. Record last updated Aug 21, 2026.

CAS No.: 343781-41-9
Jingsj CID: J-1181514-8
Molecular Formula: C₅H₂Cl₂IN
Molecular Weight: 273.887 g/mol
Category: Pharma Intermediates
Last updated: 8/21/2026

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Physicochemical Properties

Melting Point	186-190ºC(lit.)
Boiling Point	271.6±35.0 °C at 760 mmHg
Density	2.1±0.1 g/cm3
Flash Point	118.1±25.9 °C
Exact Mass	272.860901
PSA	12.89000
LogP	3.88
Vapor Pressure	0.0±0.5 mmHg at 25°C
Refractive Index	1.652

GHS Safety & Compliance

Corrosion / IrritantSignal word: Danger

H302 — Harmful if swallowed
H315 — Causes skin irritation
H318 — Causes serious eye damage
H335 — May cause respiratory irritation

Customs & Trade Information

HS Code	2933399090
Summary	2933399090. other compounds containing an unfused pyridine ring (whether or not hydrogenated) in the structure. VAT:17.0%. Tax rebate rate:13.0%. . MFN tariff:6.5%. General tariff:20.0%

Frequently Asked Questions

What is the CAS number of 3,5-Dichloro-4-iodopyridine?

The CAS number of 3,5-Dichloro-4-iodopyridine is 343781-41-9.

What are the molecular formula and molecular weight of 3,5-Dichloro-4-iodopyridine?

3,5-Dichloro-4-iodopyridine has molecular formula C5H2Cl2IN and molecular weight 273.887 g/mol.

Is 3,5-Dichloro-4-iodopyridine hazardous?

3,5-Dichloro-4-iodopyridine has GHS signal word Danger and hazard statements H302 — Harmful if swallowed; H315 — Causes skin irritation; H318 — Causes serious eye damage.

What are the upstream and downstream products of 3,5-Dichloro-4-iodopyridine?

For 3,5-Dichloro-4-iodopyridine, Upstream Products: 3,5-Dichloropyridine, 3,4,5-Trichloropyridine-2-carboxylic acid, 3,5-Dichloro-4-hydroxypyridine-2-carboxylic acid.

Data compiled from public chemical databases such as PubChem and supplier catalogs; supplier offers are provided by suppliers.

Last updated: 8/21/2026

How to cite: Jingsj. "3,5-Dichloro-4-iodopyridine (CAS 343781-41-9)". Jingsj Chemical Database. https://www.jingsj.com/compound/J-1181514-8 (accessed 2026-11-09).

Data for reference only; verify product details with suppliers before purchase.