5,8-Dihydroxy-1,4-naphthochinon

Bezeichnung:5,8-Dihydroxy-1,4-naphthochinon

CAS-Nr475-38-7

Englisch Name:5,8-Dihydroxy-1,4-naphthoquinone

CBNumberCB8194974

SummenformelC10H6O4

Molgewicht190.15

MOL-Datei475-38-7.mol

Synonyma

5,8-Dihydroxy-1,4-naphthochinon

5,8-Dihydroxy-1,4-naphthochinon physikalisch-chemischer Eigenschaften

Schmelzpunkt	220-230 °C(lit.)
Siedepunkt	285.64°C (rough estimate)
Dichte	1.3366 (rough estimate)
Brechungsindex	1.5280 (estimate)
storage temp.	Sealed in dry,Room Temperature
pka	6.98±0.20(Predicted)
Aggregatzustand	powder to crystaline
Farbe	Dark red to Brown
Wasserlöslichkeit	Soluble in water (5520 mg/L 25.).
BRN	880561
CAS Datenbank	475-38-7(CAS DataBase Reference)
NIST chemische Informationen	1,4-Naphthalenedione, 5,8-dihydroxy-(475-38-7)

Sicherheit

Kennzeichnung gefährlicher	Xi
R-Sätze:	36/37/38
S-Sätze:	22-24/25-37/39-26
WGK Germany	3
RTECS-Nr.	QL7970000
HS Code	2914409000

Gefahreninformationscode (GHS)

5,8-Dihydroxy-1,4-naphthoquinone Chemische Eigenschaften,Einsatz,Produktion Methoden

R-Sätze Betriebsanweisung:
R36/37/38:Reizt die Augen, die Atmungsorgane und die Haut.
S-Sätze Betriebsanweisung:
S22:Staub nicht einatmen.
S24/25:Berührung mit den Augen und der Haut vermeiden.
S37/39:Bei der Arbeit geeignete Schutzhandschuhe und Schutzbrille/Gesichtsschutz tragen.
S26:Bei Berührung mit den Augen sofort gründlich mit Wasser abspülen und Arzt konsultieren.
Chemische Eigenschaften
dark purple to brown-black powder
Definition
ChEBI: A naphthoquinone that is 1,4-naphthoquinone in which the hydrogens at positions 5 and 8 are replaced by hydroxy groups.
synthetische
1,8-Dinitronaphthalene and 1,5-Dinitronaphthalene mixture or both alone and one of sulfur 40% fuming sulfuric ACID reaction, the product (5, 8 – dihydroxy – naphthoquinone) into Sulfurous acid?hydrogen salt.
läuterung methode
It crystallises in red-brown needles with a green shine from EtOH. It also crystallises from hexane and is further purified by sublimation at 2-10mm. [Huppert et al. J Phys Chem 89 5811 1985.] It is sparingly soluble in H2O but soluble in alkalis. The diacetate forms golden yellow prisms from CHCl3, m 192-193o and the 5,8-dimethoxy derivative has m 157o (155o) (from pet ether) [Bruce & Thompson J Chem Soc 1089 1955, IR: Schmand & Boldt J Am Chem Soc 97 447 1975, NMR: Brockmann & Zeeck Chem Ber 101 4221 1968]. The monothiosemicarbazone has m 168o(dec) from EtOH [Gardner et al. J Am Chem Soc 74 2106 1952]. [Beilstein 8 H 412, 8 III 3600.]

Properties and Applications

ash red to black. Soluble in water for red light brown, soluble in ethanol for yellow brown, with green fluorescence. In concentrated sulfuric acid to dark yellow green, heating to rouge red, dilution after brown black precipitation. Dye aqueous solution to join sodium hydroxide to red, the air oxidation into blue.

Standard	Ironing Fastness	Light Fastness	Fulling		Persperation Fastness	Soaping	Water
			Alkali	Acid
ISO	5	6	5	4	5	5	5

5,8-Dihydroxy-1,4-naphthoquinone Upstream-Materialien And Downstream Produkte

5,8-Dihydroxy-1,4-naphthochinon Anbieter Lieferant Produzent Hersteller Vertrieb Händler.

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