Naphthalene-2,7-disulfonic acid Struktur

Naphthalin-2,7-disulfonsure

Bezeichnung:Naphthalin-2,7-disulfonsure

CAS-Nr92-41-1

Englisch Name:Naphthalene-2,7-disulfonic acid

CBNumberCB5297140

SummenformelC10H8O6S2

Molgewicht288.3

MOL-Datei92-41-1.mol

Synonyma

Naphthalin-2,7-disulfonsure

Naphthalin-2,7-disulfonsure physikalisch-chemischer Eigenschaften

Schmelzpunkt	199°C
Siedepunkt	400.53°C (rough estimate)
Dichte	1.6867 (rough estimate)
Brechungsindex	1.6950 (estimate)
storage temp.	2-8°C
pka	-0.33±0.40(Predicted)
CAS Datenbank	92-41-1(CAS DataBase Reference)
EPA chemische Informationen	2,7-Naphthalenedisulfonic acid (92-41-1)

Sicherheit

RIDADR	1759
HazardClass	8
PackingGroup	III
HS Code	2904100090

Gefahreninformationscode (GHS)

Naphthalene-2,7-disulfonic acid Chemische Eigenschaften,Einsatz,Produktion Methoden

Chemische Eigenschaften
White, crystalline solid.Soluble in water. Combustible. Naphthalene-2,7-disulfonic acid [92- 41-1]. C10H8O6S2, Mr 288.28; the sodium salt of Naphthalene-2,7-disulfonic acid is much more soluble than that of the 2,6- isomer but can be isolated and purified by precipitation of the calcium salt at lower temperature followed by recrystallization.
Verwenden
Intermediate for dyes. The disodium salt of 8 gives 2-hydroxynaphthalene-7-sulfonic acid or 2,7-dihydroxynaphthalene by fusion processes. Sulfonation by oleum gives the 1,3,6-trisulfonic acid, and nitration gives 1-nitronaphthalene-3,6- disulfonic acid. In sulfuric acid solution, the disodium salt of naphthalene-2,7-disulfonic acid undergoes an unusual reaction at the 4-position with 4,40 -bis- (dimethylamino)benzhydrol. The resulting condensation product is oxidized with lead dioxide to give the acid basic dye C.I. Acid Green 16.
Vorbereitung Methode
The 2,7-disulfonic acid is always the main product of high-temperature sulfonation of naphthalene, but at 160 C it converts slowly to an equilibrium mixture containing ca. 30 % of the 2,6-isomer. Crystallization of the pure product from conventional sulfonation is difficult, and alternative processes, (for example, reaction of naphthalene vapor with sulfur trioxide in the gas phase at 220 C) are said to give a purer product.
Definition
ChEBI: A naphthalenesulfonic acid in which the sulfo groups are attached to positions 2 and 7 of the naphthalene ring.
läuterung methode
Crystallise the acid from conc HCl. The disulfonamide has m 273o (from EtOH). [Beilstein 11 II 119, 11 III 463.]

Naphthalene-2,7-disulfonic acid Upstream-Materialien And Downstream Produkte

Naphthalin-2,7-disulfonsure Anbieter Lieferant Produzent Hersteller Vertrieb Händler.

92-41-1, Naphthalene-2,7-disulfonic acid Verwandte Suche:

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