5-(Dimethylamino)naphthalene-1-sulfonic acid

Also known as: Dansyl acid, Dansic acid, 5-Dimethylaminonaphthalene-1-sulfonic acid, 5-(Dimethylamino)-1-naphthalenesulfonic acid, 1-Dimethylaminonaphthalene-5-sulfonic acid, 5-Dimethylamino-1-naphthalenesulfonic acid

5-(Dimethylamino)naphthalene-1-sulfonic acid (CAS 4272-77-9) is a compound in the Organic Acids category listed in the Jingsj chemical database. It has the molecular formula C12H13NO3S and a molecular weight of 251.30200 g/mol. Key properties include a melting point of 316ºC and a density of 1.363 g/cm3. No supplier offers are currently listed; request a quote. Record last updated Aug 21, 2026.

CAS No.: 4272-77-9
Jingsj CID: J-44007-3
Molecular Formula: C₁₂H₁₃NO₃S
Molecular Weight: 251.30200 g/mol
Category: Organic Acids
Last updated: 8/21/2026

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Physicochemical Properties

Melting Point	316ºC
Density	1.363 g/cm3
Exact Mass	251.06200
PSA	65.99000
LogP	3.23330

Customs & Trade Information

HS Code	2921199090
Summary	2921199090 other acyclic monoamines 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 5-(Dimethylamino)naphthalene-1-sulfonic acid?

The CAS number of 5-(Dimethylamino)naphthalene-1-sulfonic acid is 4272-77-9.

What are the molecular formula and molecular weight of 5-(Dimethylamino)naphthalene-1-sulfonic acid?

5-(Dimethylamino)naphthalene-1-sulfonic acid has molecular formula C12H13NO3S and molecular weight 251.30200 g/mol.

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. "5-(Dimethylamino)naphthalene-1-sulfonic acid (CAS 4272-77-9)". Jingsj Chemical Database. https://www.jingsj.com/compound/J-44007-3 (accessed 2026-11-09).

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