7-Amino-4-hydroxynaphthalin-2-sulfonsure

Bezeichnung:7-Amino-4-hydroxynaphthalin-2-sulfonsure

CAS-Nr87-02-5

Englisch Name:J acid

CBNumberCB5264771

SummenformelC10H9NO4S

Molgewicht239.25

MOL-Datei87-02-5.mol

Synonyma

7-Amino-4-hydroxynaphthalin-2-sulfonsure

7-Amino-4-hydroxynaphthalin-2-sulfonsure physikalisch-chemischer Eigenschaften

Dichte	1.4338 (rough estimate)
Dampfdruck	0Pa at 25℃
Brechungsindex	1.6500 (estimate)
storage temp.	Keep in dark place,Inert atmosphere,Room temperature
Löslichkeit	Slightly soluble in water
pka	-0.28±0.40(Predicted)
Aggregatzustand	powder
Farbe	yellow
Wasserlöslichkeit	5g/L at 20℃
InChIKey	KYARBIJYVGJZLB-UHFFFAOYSA-N
LogP	-1.39
CAS Datenbank	87-02-5(CAS DataBase Reference)
EPA chemische Informationen	7-Amino-4-hydroxy-2-naphthalenesulfonic acid (87-02-5)

Sicherheit

Kennzeichnung gefährlicher	C
R-Sätze:	34
S-Sätze:	26-27-36/37/39
RIDADR	UN 2585 8/PG 3
WGK Germany	1
RTECS-Nr.	QK1295500
F	21
HazardClass	8
PackingGroup	III
HS Code	2922190090
Toxizität	LD50 oral in rat: 11500mg/kg

Gefahreninformationscode (GHS)

J acid Chemische Eigenschaften,Einsatz,Produktion Methoden

R-Sätze Betriebsanweisung:
R34:Verursacht Verätzungen.
S-Sätze Betriebsanweisung:
S26:Bei Berührung mit den Augen sofort gründlich mit Wasser abspülen und Arzt konsultieren.
S27:Beschmutzte, getränkte Kleidung sofort ausziehen.
S36/37/39:Bei der Arbeit geeignete Schutzkleidung,Schutzhandschuhe und Schutzbrille/Gesichtsschutz tragen.
Chemische Eigenschaften
Gray needles, white when pure. Soluble in hot water; sparingly soluble in cold water. 2-Amino-5-hydroxynaphthalene-7-sulfonic acid [87-02-5]. (7-amino-4-hydroxynaphthalene-2-sulfonic acid), J acid, C10H9NO4S, Mr 239.2, is only slightly soluble (0.1 %) in cold water but readily soluble at 100℃. The alkalimetal salts are readily soluble in water. Diazo compounds are normally coupled with J acid under alkaline conditions with reaction in the 6-position (ortho to hydroxyl); however, under acid conditions, coupling can occur in the 1- position. Reaction with bisulfite gives 4,7-dihydroxynaphthalene-2-sulfonic acid. The N-acylation, Nalkylation, and N-arylation reactions are important.
Verwenden
Azo dye intermediate.
Vorbereitung Methode
A concentrated disodium salt solution of 2-aminonaphthalene-5,7-disulfonic acid is added to 72 % sodium hydroxide at 150 ℃. After heating to 187℃ over 10 h reaction is continued at this temperature for a further 8 h until completion of the reaction is indicated by giving equivalent diazotization and coupling titers for a worked-up sample. Quenching, acidification, purging of sulfur dioxide, and filtration at 55 ℃ followed by washing with water at 50℃ result in an 88 % yield of paste. Purification by salting out the sodium salt from a hot alkaline solution gives a 90 % recovery of the product as gray crystals. An improved process with 90 % yield is claimed by feeding the concentrated 2-aminonaphthalene-5,7-disulfonic acid liquor and the caustic liquor simultaneously into the fusion reactor to maintain more stable conditions.
Definition
ChEBI: 7-amino-4-hydroxy-2-naphthalenesulfonic acid is an aminonaphthalenesulfonic acid that is 2-naphthalenesulfonic acid substituted by an amino group at position 7 and a hydroxy group at position 4 respectively. It has a role as a metabolite. It is an aminonaphthalenesulfonic acid and a member of naphthols.
Flammability and Explosibility
Not classified

J acid Upstream-Materialien And Downstream Produkte

7-Amino-4-hydroxynaphthalin-2-sulfonsure Anbieter Lieferant Produzent Hersteller Vertrieb Händler.

87-02-5, J acid Verwandte Suche:

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