m-Toluidine-4-sulfonic acid

Also known as: 3-Methylaniline-4-sulfonic acid, 4-Amino-2-methylbenzenesulfonic acid, 4-Amino-2-methylbenzene-1-sulfonic acid, 5-Aminotoluene-2-sulfonic acid, 5-Aminotoluene-2-sulphonic acid, 4-amino-o-toluenesulfonic acid, EINECS 205-120-9, MFCD00035774

m-Toluidine-4-sulfonic acid (CAS 133-78-8) is a compound in the Solvents category listed in the Jingsj chemical database. It has the molecular formula C7H9NO3S and a molecular weight of 187.21600 g/mol. Key property: a density of 1.431g/cm3. No supplier offers are currently listed; request a quote. Record last updated Aug 21, 2026.

CAS No.: 133-78-8
Jingsj CID: J-24459-7
Molecular Formula: C₇H₉NO₃S
Molecular Weight: 187.21600 g/mol
Category: Solvents
Last updated: 8/21/2026

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Physicochemical Properties

Density	1.431g/cm3
Exact Mass	187.03000
PSA	88.77000
LogP	2.48590
Refractive Index	1.61

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 m-Toluidine-4-sulfonic acid?

The CAS number of m-Toluidine-4-sulfonic acid is 133-78-8.

What are the molecular formula and molecular weight of m-Toluidine-4-sulfonic acid?

m-Toluidine-4-sulfonic acid has molecular formula C7H9NO3S and molecular weight 187.21600 g/mol.

What are the upstream and downstream products of m-Toluidine-4-sulfonic acid?

For m-Toluidine-4-sulfonic acid, Upstream Products: Tetrahydrothiophene, m-Toluidine, 3-Nitrotoluene; Downstream Products: p-Toluquinone, 2,4,6-tribromo-3-methylaniline.

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. "m-Toluidine-4-sulfonic acid (CAS 133-78-8)". Jingsj Chemical Database. https://www.jingsj.com/compound/J-24459-7 (accessed 2026-11-09).

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