3,4,5,6-Tetrachlorobenzene-1,2-diol

Also known as: Tetrachlorocatechol, Tetrachloropyrocatechol, tetrachloro-1,2-benzenediol, 3,4,5,6-tetrachloro-1,2-benzenediol, tetrachloro-pyrocatecho, tetrachlorpyrokatechin, 1,2-Benzenediol, 3,4,5,6-tetrachloro-

3,4,5,6-Tetrachlorobenzene-1,2-diol (CAS 1198-55-6) is a compound in the Alcohols category listed in the Jingsj chemical database. It has the molecular formula C6H2Cl4O2 and a molecular weight of 247.891 g/mol. Key properties include a melting point of 184-186°C (dec.), a boiling point of 309.1±37.0 °C at 760 mmHg, a density of 1.8±0.1 g/cm3 and a flash point of 140.7±26.5 °C. It is classified under GHS with signal word Danger and hazard statements H302 — Harmful if swallowed, H318 — Causes serious eye damage and H400 — Very toxic to aquatic life. No supplier offers are currently listed; request a quote. Record last updated Aug 21, 2026.

CAS No.: 1198-55-6
Jingsj CID: J-1993177-2
Molecular Formula: C₆H₂Cl₄O₂
Molecular Weight: 247.891 g/mol
Category: Alcohols
Last updated: 8/21/2026

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Physicochemical Properties

Melting Point	184-186°C (dec.)
Boiling Point	309.1±37.0 °C at 760 mmHg
Density	1.8±0.1 g/cm3
Flash Point	140.7±26.5 °C
Exact Mass	245.880890
PSA	40.46000
LogP	4.74
Vapor Pressure	0.0±0.7 mmHg at 25°C
Refractive Index	1.662
Storage Conditions	2-8°C

GHS Safety & Compliance

Corrosion / Irritant / Environmental HazardSignal word: Danger

H302 — Harmful if swallowed
H318 — Causes serious eye damage
H400 — Very toxic to aquatic life

Activity & Biological Data

Additional Information	[1]. G. Renner, et al. Acute toxicities of pentachlorophenol, pentachloroanisole, tetrachlorohydroquinone, tetrachlorocatechol, tetrachlororesorcinol, tetrachlorodimethoxybenzenes and tetrachlorobenzenediol diacetates administered to mice, Toxicological & Environmental Chemistry, 11:1, 37-50. [2]. Mukherjee, et al. Evaluation of Acute Toxicity Levels and Ethological Responses Under Tetrachlorocatechol Exposure in Common Carp, Cyprinus carpio (Linnaeus). Proc Zool Soc 67, 108–113 (2014).

Additional Information

[1]. G. Renner, et al. Acute toxicities of pentachlorophenol, pentachloroanisole, tetrachlorohydroquinone, tetrachlorocatechol, tetrachlororesorcinol, tetrachlorodimethoxybenzenes and tetrachlorobenzenediol diacetates administered to mice, Toxicological & Environmental Chemistry, 11:1, 37-50. [2]. Mukherjee, et al. Evaluation of Acute Toxicity Levels and Ethological Responses Under Tetrachlorocatechol Exposure in Common Carp, Cyprinus carpio (Linnaeus). Proc Zool Soc 67, 108–113 (2014).

Customs & Trade Information

HS Code	2908199090
Summary	HS: 2908199090. derivatives of polyphenols or phenol-alcohols containing only halogen substituents and their salts. VAT:17.0%. tax rebate rate:9.0%. supervision conditions:None. MFN tariff:5.5%. general tariff:30.0%

Frequently Asked Questions

What is the CAS number of 3,4,5,6-Tetrachlorobenzene-1,2-diol?

The CAS number of 3,4,5,6-Tetrachlorobenzene-1,2-diol is 1198-55-6.

What are the molecular formula and molecular weight of 3,4,5,6-Tetrachlorobenzene-1,2-diol?

3,4,5,6-Tetrachlorobenzene-1,2-diol has molecular formula C6H2Cl4O2 and molecular weight 247.891 g/mol.

Is 3,4,5,6-Tetrachlorobenzene-1,2-diol hazardous?

3,4,5,6-Tetrachlorobenzene-1,2-diol has GHS signal word Danger and hazard statements H302 — Harmful if swallowed; H318 — Causes serious eye damage; H400 — Very toxic to aquatic life.

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. "3,4,5,6-Tetrachlorobenzene-1,2-diol (CAS 1198-55-6)". Jingsj Chemical Database. https://www.jingsj.com/compound/J-1993177-2 (accessed 2026-11-09).

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