4-Aminotoluene-3-sulfonic acid

Also known as: 2-Amino-5-methylbenzenesulfonic acid, 6-Amino-m-toluenesulfonic acid, Benzenesulfonic acid, 2-amino-5-methyl-, p-Toluidine-2-sulfonic acid, p-Toluidine-o-sulfonic acid, 4-Amino-m-toluenesulfonic acid, m-Toluenesulfonic acid, 4-amino-, 4B acid, PTMSA

4-Aminotoluene-3-sulfonic acid (CAS 88-44-8) is a compound in the Solvents category listed in the Jingsj chemical database. It has the molecular formula C7H9NO3S and a molecular weight of 187.216 g/mol. Key properties include a melting point of 300 °C, a boiling point of 375ºC and a density of 1.4±0.1 g/cm3. It is classified under GHS with signal word Danger and hazard statements H314 — Causes severe skin burns and eye damage. No supplier offers are currently listed; request a quote. Record last updated Aug 21, 2026.

CAS No.: 88-44-8
Jingsj CID: J-46161-8
Molecular Formula: C₇H₉NO₃S
Molecular Weight: 187.216 g/mol
Category: Solvents
Last updated: 8/21/2026

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Physicochemical Properties

Melting Point	300 °C
Boiling Point	375ºC
Density	1.4±0.1 g/cm3
Exact Mass	187.030319
PSA	88.77000
LogP	0.55
Refractive Index	1.610

GHS Safety & Compliance

CorrosionSignal word: Danger

H314 — Causes severe skin burns and eye damage

Customs & Trade Information

HS Code	2921430090
Summary	HS:2921430090 toluidines and their derivatives; salts thereof VAT:17.0% Tax rebate rate:9.0% Supervision conditions:none MFN tariff:6.5% General tariff:30.0%

Frequently Asked Questions

What is the CAS number of 4-Aminotoluene-3-sulfonic acid?

The CAS number of 4-Aminotoluene-3-sulfonic acid is 88-44-8.

What are the molecular formula and molecular weight of 4-Aminotoluene-3-sulfonic acid?

4-Aminotoluene-3-sulfonic acid has molecular formula C7H9NO3S and molecular weight 187.216 g/mol.

Is 4-Aminotoluene-3-sulfonic acid hazardous?

4-Aminotoluene-3-sulfonic acid has GHS signal word Danger and hazard statements H314 — Causes severe skin burns and eye damage.

What are the upstream and downstream products of 4-Aminotoluene-3-sulfonic acid?

For 4-Aminotoluene-3-sulfonic acid, Upstream Products: 6-Methylbenzothiazole, p-Toluidine, p-Acetotoluidide; Downstream Products: 4-Hydroxybenzoic acid, p-Toluidine, 2-Amino-5-methylphenol.

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. "4-Aminotoluene-3-sulfonic acid (CAS 88-44-8)". Jingsj Chemical Database. https://www.jingsj.com/compound/J-46161-8 (accessed 2026-11-06).

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