3-Hydroxy-2-naphthalincarbonsäure

Bezeichnung:3-Hydroxy-2-naphthalincarbonsäure

CAS-Nr92-70-6

Englisch Name:3-Hydroxy-2-naphthoic acid

CBNumberCB4334794

SummenformelC11H8O3

Molgewicht188.18

MOL-Datei92-70-6.mol

Synonyma

3-Hydroxy-2-naphthoesure

3-Hydroxy-2-naphthalincarbonsäure

3-Hydroxy-2-naphthalincarbonsäure physikalisch-chemischer Eigenschaften

Schmelzpunkt	218-221 °C(lit.)
Siedepunkt	283.17°C (rough estimate)
Dichte	1.43 g/cm3 (23℃)
Brechungsindex	1.7160 (estimate)
Flammpunkt	>150°C
storage temp.	Sealed in dry,Room Temperature
Löslichkeit	0.072g/l practically insoluble
pka	3.02±0.30(Predicted)
Aggregatzustand	Fine Crystalline Powder
Farbe	Yellow to beige-brown
Wasserlöslichkeit	PRACTICALLY INSOLUBLE
maximale Wellenlänge (λmax)	395nm(H2O (pH 3.5))(lit.)
Merck	14,4835
BRN	744100
CAS Datenbank	92-70-6(CAS DataBase Reference)
NIST chemische Informationen	2-Naphthalenecarboxylic acid, 3-hydroxy-(92-70-6)
EPA chemische Informationen	3-Hydroxy-2-naphthoic acid (92-70-6)

Sicherheit

Kennzeichnung gefährlicher	Xn,Xi
R-Sätze:	22-36-36/37/38
S-Sätze:	26-37/39
WGK Germany	1
RTECS-Nr.	QL1755000
TSCA	Yes
HS Code	29182910
Giftige Stoffe Daten	92-70-6(Hazardous Substances Data)
Toxizität	The acute oral LD50 of 3-Hydroxy-2-naphthoic acid in rats was 823-1040 mg/kg bw.

Gefahreninformationscode (GHS)

3-Hydroxy-2-naphthoic acid Chemische Eigenschaften,Einsatz,Produktion Methoden

R-Sätze Betriebsanweisung:
R22:Gesundheitsschädlich beim Verschlucken.
R36:Reizt die Augen.
R36/37/38:Reizt die Augen, die Atmungsorgane und die Haut.
S-Sätze Betriebsanweisung:
S26:Bei Berührung mit den Augen sofort gründlich mit Wasser abspülen und Arzt konsultieren.
S37/39:Bei der Arbeit geeignete Schutzhandschuhe und Schutzbrille/Gesichtsschutz tragen.
Chemische Eigenschaften
yellow to beige-brown fine crystalline powder. 3 -Hydroxy-2-naphthoic acid [92-70-6], BON acid, C11H8O3, Mr 188.17, mp 222℃, forms pale yellow crystals from aqueous ethanol. Alkaline solutions have a green fluorescence. Aqueous ferric chloride produces a blue color, and warming with CHCl3– NaOH results in a green color. Oxidation with alkaline permanganate gives 2-carboxyphenylglyoxylic acid and then phthalic acid. Dry distillation produces dibenzoxanthone. Bromination gives the 4,7-dibromo derivative; nitration, the 4-nitro derivative; and sulfonation with oleum, the 5,7-disulfonic acid derivative.
Verwenden
3-Hydroxy-2-naphthoic acid is mainly used as intermediate for the production of dyes and pigments. Further uses are as intermediate for insecticides and pharmaceuticals (ECB, 2000).
Verwenden
2-hydroxy-3-naphthoic acid (BON) is coupled with diazo compounds and their calcium salts are bright red bleed resistance pigments. The somewhat higher cost manganese salt shows better exterior durability than the calcium or barium salts. The BON red pigments are characterized by an extremely high degree of color stability, resistance to acids and alkalies and are nontoxic.
synthetische
3 -Hydroxy-2-naphthoic acid is invariably by the Kolbe – Schmitt reaction of carbon dioxide with the dried sodium salt of 2-naphthol at 220 – 260℃. Many improvements in both process and equipment have been developed. The main problems are removal of the 50 % unreacted 2-naphthol and avoidance of a tarry byproduct. Yields of 80 % based on the amount of 2-naphthol consumed are possible despite the low conversion.
Definition
ChEBI: 3-Hydroxy-2-naphthoate is a naphthoic acid.
Hazard
Irritant.
läuterung methode
Crystallise it from water or acetic acid. The S-benzyisothiuronium salt has m 216-217o (from EtOH). It forms many metal complex salts. [Beilstein 10 H 333, 10 III 1084.]

3-Hydroxy-2-naphthoic acid Upstream-Materialien And Downstream Produkte

3-Hydroxy-2-naphthalincarbonsäure Anbieter Lieferant Produzent Hersteller Vertrieb Händler.

92-70-6, 3-Hydroxy-2-naphthoic acid Verwandte Suche:

Send Inquriy