2-Aminonaphthalin-1-sulfonsure

Bezeichnung:2-Aminonaphthalin-1-sulfonsure

CAS-Nr81-16-3

Englisch Name:2-Aminonaphthalene-1-sulfonic acid

CBNumberCB1128987

SummenformelC10H9NO3S

Molgewicht223.25

MOL-Datei81-16-3.mol

Synonyma

2-Aminonaphthalin-1-sulfonsure

2-Aminonaphthalin-1-sulfonsure physikalisch-chemischer Eigenschaften

Schmelzpunkt	180 °C
Siedepunkt	220°C (rough estimate)
Dichte	1.3588 (rough estimate)
Brechungsindex	1.5250 (estimate)
storage temp.	-20°C Freezer, Under inert atmosphere
Löslichkeit	DMSO (Slightly), Methanol (Slightly, Heated), Water (Slightly, Heated)
Aggregatzustand	Solid
pka	pK1: 2.35 (25°C)
Farbe	White to Off-White
Wasserlöslichkeit	4.083g/L(20 ºC)
Merck	14,6406
BRN	613084
CAS Datenbank	81-16-3(CAS DataBase Reference)
NIST chemische Informationen	2-Naphthylamine-1-sulfonic acid(81-16-3)
EPA chemische Informationen	2-Amino-1-naphthalenesulfonic acid (81-16-3)

Sicherheit

R-Sätze:	36/37/38-40
S-Sätze:	26-36/37/39
RIDADR	2585
WGK Germany	1
RTECS-Nr.	QK1250000
TSCA	Yes
HS Code	2921.45.9010
HazardClass	8
PackingGroup	III
Giftige Stoffe Daten	81-16-3(Hazardous Substances Data)

Gefahreninformationscode (GHS)

2-Aminonaphthalene-1-sulfonic acid Chemische Eigenschaften,Einsatz,Produktion Methoden

R-Sätze Betriebsanweisung:
R36/37/38:Reizt die Augen, die Atmungsorgane und die Haut.
R40:Verdacht auf krebserzeugende Wirkung.
S-Sätze Betriebsanweisung:
S26:Bei Berührung mit den Augen sofort gründlich mit Wasser abspülen und Arzt konsultieren.
S36/37/39:Bei der Arbeit geeignete Schutzkleidung,Schutzhandschuhe und Schutzbrille/Gesichtsschutz tragen.
Chemische Eigenschaften
Grey white to light pink powder. 2-Aminonaphthalene-1-sulfonic acid [81-16-3]. Tobias acid, C10H9NO3S, Mr 223.24, is sparingly soluble in water but the sodium salt is readily soluble. Coupling with diazo compounds takes place in the 1-position with elimination of the sulfonic acid group.
Verwenden
Azo dye intermediate, optical brighteners. Sulfonation with oleum gives 2-aminonaphthalene-1,5-disulfonic acid, which can be desulfonated to produce 2-aminonaphthalene-5- sulfonic acid. Tobias acid is used as a diazo component in acid dyes (e.g., C.I. Acid Yellow 19), red reactive dyes, and pigments such as the important Lithol Reds, [e.g., C.I. Pigment Red 49]. The free acid of C.I. Pigment Red 49 is also remarkably insoluble and can be used as a pigment.
Verwenden
2-Amino-1-naphthalenesulfonic acid has been used in the preparation of 2-(2-naphthylamino)benzoxazole by reacting with 2-chlorobenzoxazole.
Vorbereitung Methode
2-Hydroxynaphthalene-1-sulfonic acid is heated with a mixture of ammonia and ammonium sulfite in an autoclave at 150 ℃ and 1 MPa for 30 h. The reaction mixture is added to a slurry of lime, and excess ammonia is driven off. Inorganic calcium salts are filtered off at 80℃, and the filtrate is acidified with hydrochloric acid at 40℃ to precipitate Tobias acid in 95 % yield. Care must be taken throughout the process to avoid desulfonation and formation of 2- naphthylamine.
Allgemeine Beschreibung
2-Amino-1-naphthalenesulfonic acid is a manufacturing intermediate in the monosulfo monoazo color additive D&C Red No. 34 and its lakes.
läuterung methode
Crystallise the acid under nitrogen from boiling water and dry it in a steam oven [Bryson Trans Faraday Soc 47 522, 527 1951]. [Beilstein 14 III 2240, 14 IV 2792.]

2-Aminonaphthalene-1-sulfonic acid Upstream-Materialien And Downstream Produkte

2-Aminonaphthalin-1-sulfonsure Anbieter Lieferant Produzent Hersteller Vertrieb Händler.

81-16-3, 2-Aminonaphthalene-1-sulfonic acid Verwandte Suche:

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