Tobias Acid (CAS 81-16-3) — formula C10H9NO3S, molecular weight 223.25; category organic chemicals.
| CAS Number | 81-16-3 |
|---|---|
| Molecular Formula | C10H9NO3S |
| Molecular Weight | 223.25 |
| LogP | log Kow= -1.16 |
| Applications | Uses: Used in optical brighteners and as a diazo component in acid dyes, red reactive dyes, and pigments, [HSDB], Tobias acid is used as a diazo component in acid dyes (eg, C.I. Acid Yellow 19), and pigments such as the important Lithol Reds, (eg, C.I. Pigment Red 49)., Azo dye intermediate, optical brighteners, Methods of Manufacturing: PREPD BY SULFONATION OF 2-NAPHTHYLAMINE: TINKER, HANSEN, US PATENT 1, 969, 189 (1934 TO DU PONT)., Sulfonation of beta-naphthol with chlorosulfonic acid in nitrobenzene at 0 °C followed by heating the resulting 1-sulfonic acid with ammonium hydrogen sulfite and ammonia at 145-150 °C. Purification is by precipitation from dilute solution of the sodium salt., By amination of the appropriate hydroxynaphthalenesulfonic acid., General Manufacturing Information: 1-Naphthalenesulfonic acid, 2-amino-: ACTIVE, 2-NAPHTHYLAMINE CAN BE USED AS INTERMEDIATE IN PRODN OF ... DYES. HOWEVER, IT IS NOT NOW USUALLY USED AS SUCH, & FREQUENTLY 2-AMINO-1-NAPHTHALENE-SULFONIC ACID IS SUBSTITUTED FOR IT. |
| Category | Organic Chemicals |
Documented applications: Uses: Used in optical brighteners and as a diazo component in acid dyes, red reactive dyes, and pigments, [HSDB], Tobias acid is used as a diazo component in acid dyes (eg, C.I. Acid Yellow 19), and pigments such as the important Lithol Reds, (eg, C.I. Pigment Red 49)., Azo dye intermediate, optical brighteners, Methods of Manufacturing: PREPD BY SULFONATION OF 2-NAPHTHYLAMINE: TINKER, HANSEN, US PATENT 1, 969, 189 (1934 TO DU PONT)., Sulfonation of beta-naphthol with chlorosulfonic acid in nitrobenzene at 0 °C followed by heating the resulting 1-sulfonic acid with ammonium hydrogen sulfite and ammonia at 145-150 °C. Purification is by precipitation from dilute solution of the sodium salt., By amination of the appropriate hydroxynaphthalenesulfonic acid., General Manufacturing Information: 1-Naphthalenesulfonic acid, 2-amino-: ACTIVE, 2-NAPHTHYLAMINE CAN BE USED AS INTERMEDIATE IN PRODN OF ... DYES. HOWEVER, IT IS NOT NOW USUALLY USED AS SUCH, & FREQUENTLY 2-AMINO-1-NAPHTHALENE-SULFONIC ACID IS SUBSTITUTED FOR IT..
Tobias Acid is a carbon-based organic compound with CAS registry number 81-16-3 and molecular formula C10H9NO3S (molecular weight 223.25), belonging to the organic chemicals segment of chemical raw materials.
CAS number: 81-16-3
Its molecular formula C10H9NO3S comprises 10 C, 9 H, 1 N, 3 O, 1 S atoms.
Also known as: Tobias Acid
Category: organic chemicals
The CAS registry number of Tobias Acid is 81-16-3.
Molecular formula C10H9NO3S, molecular weight 223.25.
It is also registered under: Tobias Acid.
Recorded applications: Uses: Used in optical brighteners and as a diazo component in acid dyes, red reactive dyes, and pigments, [HSDB], Tobias acid is used as a diazo component in acid dyes (eg, C.I. Acid Yellow 19), and pigments such as the important Lithol Reds, (eg, C.I. Pigment Red 49)., Azo dye intermediate, optical brighteners, Methods of Manufacturing: PREPD BY SULFONATION OF 2-NAPHTHYLAMINE: TINKER, HANSEN, US PATENT 1, 969, 189 (1934 TO DU PONT)., Sulfonation of beta-naphthol with chlorosulfonic acid in nitrobenzene at 0 °C followed by heating the resulting 1-sulfonic acid with ammonium hydrogen sulfite and ammonia at 145-150 °C. Purification is by precipitation from dilute solution of the sodium salt., By amination of the appropriate hydroxynaphthalenesulfonic acid., General Manufacturing Information: 1-Naphthalenesulfonic acid, 2-amino-: ACTIVE, 2-NAPHTHYLAMINE CAN BE USED AS INTERMEDIATE IN PRODN OF ... DYES. HOWEVER, IT IS NOT NOW USUALLY USED AS SUCH, & FREQUENTLY 2-AMINO-1-NAPHTHALENE-SULFONIC ACID IS SUBSTITUTED FOR IT..
Category: Organic Chemicals.
Independent reference data for Tobias Acid (CAS 81-16-3), compiled from public chemistry databases.
| CAS Registry Number | 81-16-3 |
|---|---|
| PubChem CID | 6670 |
| Molecular formula | C10H9NO3S |
| IUPAC name | 2-aminonaphthalene-1-sulfonic acid |
| UNII (FDA) | F9QKW1FCE0 |
| Molecular Weight | 223.25 |
|---|---|
| XLogP3 | 1.8 |
| Hydrogen Bond Donor Count | 2 |
| Hydrogen Bond Acceptor Count | 4 |
| Rotatable Bond Count | 1 |
| Exact Mass | 223.03031432 |
| Monoisotopic Mass | 223.03031432 |
| Topological Polar Surface Area | 88.8 |
| Heavy Atom Count | 15 |
| Solubility | In water, 4,100 mg/l @ 20 °C |
|---|---|
| LogP | log Kow= -1.16 |
| LogP | -1.16 |
| Dissociation Constants | pK1= 2.35 in water @ 25 °C |
81-16-3; 2-AMINO-1-NAPHTHALENESULFONIC ACID; Tobias acid; 2-Naphthylamine-1-sulfonic acid; Kyselina tobiasova; 1-Naphthalenesulfonic acid, 2-amino-; F9QKW1FCE0; Kyselina 2-naftylamin-1-sulfonova; DTXSID7020922; NSC-5523; DTXCID90922; RefChem:463279; 201-331-5; 2-aminonaphthalene-1-sulfonic acid; CCRIS 9048; MFCD00003988
| GHS notification summary | 76.5% (26 / 34) |
|---|
| GHS notification summary | 76.5% (26 / 34) |
|---|---|
| Reported hazard statements | H319 (20.6%) |
This chemical does not meet GHS hazard criteria for 76.5% (26 of 34) of all reports.
H319 (20.6%): Causes serious eye irritation [Warning Serious eye damage/eye irritation]
Tobias Acid · CAS 81-16-3 · C10H9NO3S. UNII F9QKW1FCE0. Solubility: In water, 4,100 mg/l @ 20 °C; LogP: log Kow= -1.16; LogP: -1.16.
Source: PubChem / Wikidata; the batch COA governs where values differ.
Supplier: Jinan Shenghe Chemical Co., Ltd.
中文页面: Tobias Acid