1,5-Dihydroxy naphthalene

1,5-Dihydroxy naphthalene Basic information

Product Name:	1,5-Dihydroxy naphthalene
Synonyms:	Naphthalene-1,5-diol;1,8-NAPHTHALENEDIMETHANOL;1,5-DIHYDROXYNAPHTHALENE;1,5-NAPHTHALENEDIOL;1,5-Dihydroxynaphthalene 97%;1,5-Dihydroxy phthalene;1,5-Naphthalenediol for synthesis;1,5-DihydroxynaphthaL
CAS:	83-56-7
MF:	C10H8O2
MW:	160.17
EINECS:	201-487-4
Product Categories:	Intermediates of Dyes and Pigments;Naphthalene derivatives;Indazoles;bc0001
Mol File:	83-56-7.mol

1,5-Dihydroxy naphthalene Chemical Properties

Melting point	259-261 °C (dec.) (lit.)
Boiling point	246.06°C (rough estimate)
density	1.0924 (rough estimate)
vapor pressure	0-0Pa at 25℃
refractive index	1.5418 (estimate)
Fp	252°C
storage temp.	Inert atmosphere,Room Temperature
solubility	0.6g/l
pka	9.28±0.40(Predicted)
form	Solid
color	Pale Beige to Very Dark Brown
PH	6 (0.5g/l, H2O, 20℃)
Water Solubility	Soluble in water.
BRN	2044951
LogP	1.7-1.82 at 23℃
CAS DataBase Reference	83-56-7(CAS DataBase Reference)
NIST Chemistry Reference	1,5-Naphthalenediol(83-56-7)
EPA Substance Registry System	1,5-Naphthalenediol (83-56-7)

Safety Information

Hazard Codes	Xn,N,Xi
Risk Statements	22-51/53-36-36/37/38
Safety Statements	22-24/25-61-39-29-26
WGK Germany	2
RTECS	QJ4740000
F	8-21
TSCA	Yes
HS Code	29072900

MSDS Information

Provider	Language
1,5-Dihydroxy naphthalene	English
SigmaAldrich	English
ALFA	English

1,5-Dihydroxy naphthalene Usage And Synthesis

Chemical Properties	Grey powder
Uses	1,5-Dihydroxynaphthalene is an intermediate of synthetic mordant azo dyes. It is an intermediate used in organic synthesis, pharmaceuticals, dyestuff fields and photograph industry.
Purification Methods	The diol (~30g) is purified by making into a thick paste with H2O and suspending this in 3L of H2O containing 200mL of EtOH, boiling under reflux for 3hours, cooling to 30o, saturating with SO2, digesting below the boiling point for 1hour and filtering fast through a large hot filter paper. The hot filtrate is poured onto crushed ice whereby the diol (15-20g) separates as colourless needles (m 258o) [Wheeler & Ergle J Am Chem Soc 52 4873 1930]. Recrystallise it from H2O or nitromethane under N2 to avoid oxidation. The dibenzoyl derivative has m 245o (from EtOH). The 5-methoxy-1-naphthol derivative [prepared from the diol in MeOH/HCl (1:30 weight to volume ratio) and set aside at 25o for 9-10days] crystallised from pet ether (m 135-136o) or from CH2Cl2/hexane (needles m 140o) [Bell & McCaffrey Aust J Chem 46 731 1993]. [Beilstein 6 I 477, 6 II 950, 6 III 5265, 6 IV 6554.]

1,5-Dihydroxy naphthalene Preparation Products And Raw materials

Raw materials	Sulfuric acid-->FUMING SULFURIC ACID-->Naphthalene-->1,5-Naphthalenedisulfonic acid-->1-Naphthalenesulfonic acid, 8-amino-4-hydroxy--->1,5-naphthylene di(acetate)-->5-Amino-1-naphthol-->Disodium 1,5-naphthalenedisulfonate-->1-Naphthol-5-sulfonic acid-->Sodium 4-amino-1-naphthalenesulfonate-->5-Amino-1-naphthalenesulfonic acid
Preparation Products	PLUMBAGIN-->Mordant Black 9-->5-Methoxy-1-naphthalenol-->Acid mordant Black 7-->sodium 3-[(1,5-dihydroxy-2-naphthyl)azo]-4-hydroxy-5-nitrobenzenesulphonate-->Mordant Black 9-->6-Acetyl-2,5-dihydroxy-1,4-naphthoquinone

6H-Benzo(d)naphtho(1,2-b)pyran-6-one, 4-(6-deoxy-alpha-galactofuranosy l)-1-hydroxy-10,12-dimethoxy-8-methyl- Acetamide, 2-((1,2-dihydro-5,6,17,19,21-pentahydroxy-23-methoxy-2,4,12 ,16,18,20,22-heptamethyl-1,11-dioxo-2,7-(epoxypentadeca(1,11,13)trieni mino)naphtho(2,1-b)furan-9-yl)oxy)-N-ethyl-, 21-acetate ravidomycin Rifampicin derivative 12-((6-Deoxyhexopyranosyl)oxy)-1,10-dihydroxy-8-methyl-6H-benzo(d)naph tho(1,2-b)pyran-6-one 1,5-Dihydroxy naphthalene Anthracene-1,4,9,10-tetraol 2,6-DIBROMO-1,5-DIHYDROXYNAPHTHALENE 4,8-DIMETHOXY-NAPHTHALENE-1-CARBALDEHYDE 4-O-(Carboxymethyl)rifamycin 1-Hydroxyethylidene-1,1-diphosphonic acid Rifamycin Sodium Rifampicin Dihydro-1,4,5,8-tetrahydroxyanthraquinone Rifametane 5-Hydroxy Propranolol RARECHEM BW GA 0370 1 5-DIMETHOXYNAPHTHALENE 97

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