81-04-9

Basic information

• Product Name: 1,5-Naphthalenedisulfonic acid
• Synonyms: 1,5-disulfonic acid;5-Naphthalenedisulfonic acid;Naphthalene-1,5-disulfonic acid tetrahydrate;1,5-phthalenedisulfonic acid;NAPHTHALENE-1,5-DISULFONIC ACID DISODIUM SALT;naphthalene-1,5-disulphonic acid;SODIUM 1,5-NAPHTHALENEDISULFONATE DIBASIC;1,5-Naphthalenedisulphonicacid
• CAS NO: 81-04-9
• Molecular Formula: C₁₀H₈O₆S₂
• Molecular Weight: 288.3
• EINECS: 216-732-0
• Product Categories: Intermediates of Dyes and Pigments;Organic acids
• Mol File: 81-04-9.mol
• Article Data: 10

Chemical Properties

• Melting Point: 242.5°C (rough estimate)
• Boiling Point: 400.53°C (rough estimate)
• Appearance: /
• Density: 1.7040
• Vapor Pressure: 0Pa at 25℃
• Refractive Index: 1.5630 (estimate)
• Storage Temp.: Store below +30°C.
• PKA: -0.60±0.40(Predicted)
• Water Solubility: 90.52g/L at 25℃
• CAS DataBase Reference: 1,5-Naphthalenedisulfonic acid(CAS DataBase Reference)
• NIST Chemistry Reference: 1,5-Naphthalenedisulfonic acid(81-04-9)
• EPA Substance Registry System: 1,5-Naphthalenedisulfonic acid(81-04-9)

Safety Data

• Hazard Codes: C
• Statements: 34
• Safety Statements: 22-24/25-45-36/37/39-26
• RIDADR: UN 2585
• WGK Germany: 1
• HazardClass: 8
• PackingGroup: III
• Hazardous Substances Data: 81-04-9(Hazardous Substances Data)

Usage

Chemical Properties

White powder

Flammability and Explosibility

Notclassified

Safety Profile

Very low oral toxicity. Whenheated to decomposition it emits toxic fumes of SOx. Seealso SULFONATES.

InChI:InChI=1/C10H8O6S2/c11-17(12,13)9-5-1-3-7-8(9)4-2-6-10(7)18(14,15)16/h1-6H,(H,11,12,13)(H,14,15,16)

Upstream product

• 91-20-3 naphthalene 
• 64-17-5 ethanol 
• 122290-30-6 4,8-disulfo-naphthalene-2-diazonium-betaine 
• 85-47-2 1-naphthalenesulfonic acid 
• 117-55-5 4-aminonaphthalene-1,5-disulfonic acid 
• 7664-93-9 sulfuric acid 
• 7790-94-5 chlorosulfonic acid 
• 56-23-5 tetrachloromethane 
• 7446-11-9 sulfur trioxide 
• 1655-29-4 disodium 1,5-naphthalenedisulfonate 

Downstream Products

• 1825-30-5 1,5-dichloronaphthalene 
• 117-59-9 1-hydroxynaphthalene-5-sulphonic acid 
• 83-56-7 1,5-dihydroxynaphthalene 
• 92-41-1 2,7-naphthalenedisulfonic acid 
• 581-75-9 naphthalene-2,6-disulfonic acid 
• 117-86-2 3-nitro naphthalene-1,5-disulphonic acid 
• 91-20-3 naphthalene 
• 1928-01-4 naphthalene-1,5-disulphonyl chloride 
• 860032-31-1 5-[(R)-2-(2-{4-[4-(2-amino-2-methyl-propoxy)-phenylamino]-phenyl}-ethylamino)-1-hydroxy-ethyl]-8-hydroxy-1H-quinolin-2-one napadisylate 
• 1220908-17-7 methyl 1,1,N-trimethyl-N-(3,3-diphenylpropyl)-2-aminoethyl 1,4-dihydro-2,6-dimethyl-4-(3-nitrophenyl)pyridine-3,5-dicarboxylate napadisylate 
• 864783-32-4 biphenyl-2-ylcarbamic acid 1-{2-[5-(4-hydroxybenzylamino)pentyl-carbamoyl]ethyl}piperidin-4-yl ester 1,5-naphthalenedisulfonic acid salt 
• 1240299-34-6 6-(4-{4-[2-(4-acetylpiperazin-1-yl)ethoxy]phenyl}piperidin-1-yl)-3-(trifluoromethyl)-7,8-dihydro[1,2,4]triazolo[4,3-b]pyridazine napadisylate 

Relevant articles and documents

Preparation method of clean product amino C acid

The invention relates to a preparation method of clean product amino C acid. The preparation method comprises the steps that refined naphthalene is doubly sulfonated, then 1,5-naphthalene disulfonic acid is obtained, after nitration, 3-nitronaphthalene-1,5-disulfonic acid is generated, then neutralizing is conducted through liquid caustic soda, and the amino C acid is obtained through hydrazine hydrate reduction. Compared with an original production technology, no waste residue is generated in the whole technological process, the purpose of emission reduction is achieved, and the technology issimpler, more convenient and safer and has the actual effect.

Liquid crystal composition and liquid crystal element

The present invention relates to a liquid crystal composition comprising a compound represented by the following formula (1) and a liquid crystal and a liquid crystal element containing the liquid crystal composition: wherein R1, R2, R3, R4, R5, R6 and R7 each independently represent a hydrogen atom or a substituent; and X represents an oxygen atom or a sulfur atom.

The positional reactivity order in the sulfur trioxide sulfonation of benzene and naphtalene derivatives containing an electron-withdrawing substituent

The reaction of sulfur trioxide with derivatives of benzene and naphthalene containing an electron-withdrawing substituent, viz.-SO3H, -SO2Ph, -NO2, -CHO, -COPh, -CO2H, and -CO2Me, in dichloromethane as solvent at ca. 22 deg C has been studied by analysis of the resulting mixtures of the sulfo derivatives with 1H-NMR.The initial sulfonation of the benzene derivatives yields the corresponding 3-sulfonic acid (3-S) and subsequently, with the exception of nitrobenzene and methyl benzoate, small amounts of 3,5-S2.Benzenesulfonic acid in addition undergoes sulfonylation giving 3,3'-di- and 3,5,3'-trisulfodiphenyl sulfone.Monosulfonation of naphtalene-1-S yields the 1,5-S2, 1,6-S2 and 1,7-S2 derivatives in a ratio of 71:20:9.On using a large excess of SO3, the eventual products are 1,3,5-S3, 1,3,6-S3 and 1,3,5,7-S4.Monosulfonation of naphthalene yields 5-S, 6-S, 7-S and 8-S in a 55:9:6:30 ratio, that of 1-benzoylnaphthalene 5-S, 6-S and 7-S in a ratio of 83:11:6, and 1-nitronaphtalene only the 5-S.The absence of peri sulfonation with 1-sulfo-, 1-benzoyl- and 1-nitronaphthalene is due to prohibitive steric hidrance. 1-Naphthoic acid and its methyl ester upon SO3 sulfonation and aqueous work-up both yield 5- and 8-sulfonaphthoic acid in a ratio of 65:35 and 77:21, respectively.The initially formed peri-substituted product is the intramolecular anhydride of 8-sulfo-1-naphthoic acid (5).All the 2-substituted naphthalenes yield 5-S and 8-S upon SO3 sulfonation of which the former sulfo isomer is far in excess.The positional reactivity orders for the SO3 sulfonation of the monosubstituted naphthalene derivatives are discussed in terms of the difference in reactivity of the α- and β-positions, and the steric and electronic effects of the deactivating substituent.