1-Naphthol
- Product Name
- 1-Naphthol
- CAS No.
- 90-15-3
- Chemical Name
- 1-Naphthol
- Synonyms
- naphthalen-1-ol;1-naphthalenol;1-HYDROXYNAPHTHALENE;ALPHA-NAPHTHOL;α-Naphthol;1-naphtol;ALPHA-NAPTHOL;furro er;Oxidation base 33;BETA NAPTHOL 98% MIN.
- CBNumber
- CB0279325
- Molecular Formula
- C10H8O
- Formula Weight
- 144.17
- MOL File
- 90-15-3.mol
1-Naphthol Property
- Melting point:
- 94-96 °C(lit.)
- Boiling point:
- 278-280 °C(lit.)
- Density
- 1.224
- bulk density
- 450kg/m3
- vapor density
- 4.5 (120 °C, vs air)
- vapor pressure
- 1 mm Hg ( 94 °C)
- refractive index
- 1.6224
- Flash point:
- 125 °C
- storage temp.
- Store below +30°C.
- solubility
- Soluble in benzene, chloroform, ether and ethanol.
- pka
- 9.34(at 25℃)
- form
- Crystalline Flakes
- color
- white to off-white
- Odor
- Slight phenolic odor
- explosive limit
- 5%
- Water Solubility
- 436.7mg/L(25 ºC)
- λmax
- 324nm(MeOH)(lit.)
- Sensitive
- Air & Light Sensitive
- Merck
- 14,6383
- BRN
- 1817321
- Stability:
- Stable, but air and light sensitive - store under inert gas. Incompatible with strong bases, strong oxidizing agents.
- InChIKey
- KJCVRFUGPWSIIH-UHFFFAOYSA-N
- LogP
- 2.84 at 25℃
- CAS DataBase Reference
- 90-15-3(CAS DataBase Reference)
- NIST Chemistry Reference
- 1-Naphthalenol(90-15-3)
- EPA Substance Registry System
- 1-Naphthol (90-15-3)
Safety
- Hazard Codes
- Xn,N
- Risk Statements
- 21/22-37/38-41-51/53
- Safety Statements
- 22-26-37/39-2-61
- RIDADR
- UN 2811 6.1/PG 3
- WGK Germany
- 1
- RTECS
- QL2800000
- F
- 8-23
- Autoignition Temperature
- 510 °C
- TSCA
- Yes
- HazardClass
- 6.1
- PackingGroup
- III
- HS Code
- 29071510
- Hazardous Substances Data
- 90-15-3(Hazardous Substances Data)
- Toxicity
- LD50 orally in Rabbit: 1870 mg/kg LD50 dermal Rabbit 880 mg/kg
Hazard and Precautionary Statements (GHS)
- Symbol(GHS)
-
- Signal word
- Danger
- Hazard statements
-
H302Harmful if swallowed
H311Toxic in contact with skin
H315Causes skin irritation
H317May cause an allergic skin reaction
H318Causes serious eye damage
H335May cause respiratory irritation
H371May cause damage to organs
H410Very toxic to aquatic life with long lasting effects
- Precautionary statements
-
P273Avoid release to the environment.
P280Wear protective gloves/protective clothing/eye protection/face protection.
P301+P312IF SWALLOWED: call a POISON CENTER or doctor/physician IF you feel unwell.
P305+P351+P338IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continuerinsing.
N-Bromosuccinimide Price
- Product number
- 8.22289
- Product name
- 1-Naphthol
- Purity
- for synthesis
- Packaging
- 250g
- Price
- $53.2
- Updated
- 2025/07/31
- Product number
- 8.22289
- Product name
- 1-Naphthol
- Purity
- for synthesis
- Packaging
- 1kg
- Price
- $162
- Updated
- 2025/07/31
- Product number
- 33420
- Product name
- 1-Naphthol
- Purity
- puriss. p.a., reag. Ph. Eur., ≥99% (GC)
- Packaging
- 100g
- Price
- $270
- Updated
- 2025/07/31
- Product number
- N1000
- Product name
- General Purpose Viscosity Standard; UKAS ISO/IEC17025 and ISO 17034 certified
- Purity
- viscosity 2610 mPa.s (25 °C)
- Packaging
- 500 mL
- Price
- $192
- Updated
- 2025/07/31
- Product number
- 33420
- Product name
- 1-Naphthol
- Purity
- puriss. p.a., reag. Ph. Eur., ≥99% (GC)
- Packaging
- 250g
- Price
- $593
- Updated
- 2025/07/31
1-Naphthol Chemical Properties,Usage,Production
Description
1-Naphthol, or α-naphthol, is a fluorescent organic compound with the formula C10H7OH. It is a white solid. It is an isomer of 2-naphthol differing by the location of the hydroxyl group on the naphthalene ring. The naphthols are naphthalene homologues of phenol, with the hydroxyl group being more reactive than in the phenols. Both isomers are soluble in simple alcohols, ethers, and chloroform. They are precursors to a variety of useful compounds. Naphthols (both 1 and 2 isomers) are used as biomarkers for livestock and humans exposed to polycyclic aromatic hydrocarbons.
α-naphtol, combined with epichlorhydrine and sodium hydroxide to form alpha-naphtyl glycidyl ether, caused sensitization in one of three workers in a chemical plant.
Chemical Properties
1-Naphthol is a light grey to brown solid with an unpleasant phenol odour, vapour volatility and sublimation. The compound darkens on exposure to air or light and evaporates with water vapour. Soluble in ethanol, ether, benzene, chloroform and alkali solutions, insoluble in water. In contact with ferric chloride produces a purple precipitate.
Uses
1-Naphthol is used as a precursor in the manufacturing of various azo dyes and pharmaceuticals such as nadolol. It is used as biomarkers. It is used in analytical chemistry as Molisch's reagent (1-naphthol dissolved in ethanol) for checking the presence of carbohydrates. It plays an essential role with sodium hypobromite to detect the presence of arginine in proteins, which is called as Sakaguchi test.
Preparation
2-Isopropylnaphthalene can be used to synthesize 1-naphthol by oxidation via the hydroperoxide (Hock synthesis).
Historically 1-naphthol was produced via caustic fusion of naphthalene-1-sulfonic acid, but this was superseded by the I.G. Farbenindustrie process involving hydrolysis of 1-naphthylamine with aqueous 22 % sulfuric acid at 200°C under pressure in a lead-lined autoclave. To obtain a purer product, Union Carbide developed a process based on catalytic oxidation of tetralin to 1-tetralol and 1-tetralone followed by dehydrogenation. The two-stage catalytic process is claimed to give an overall yield of 72% 1-naphthol, with an overall efficiency of 97%.
Application
1-Naphthol is a hydroxyl-aromatic compound. It has been used as a prooxidant to analyze its ability to induce hemolysis in a zebrafish G6PD (glucose-6-phosphate dehydrogenase) deficiency model.
Definition
ChEBI: 1-naphthol is a naphthol carrying a hydroxy group at position 1. It has a role as a genotoxin and a human xenobiotic metabolite.
Reactions
1-Naphthol is reduced by sodium in liquid ammonia to give 5,6,7,8-tetrahydro-1-naphthol; oxidised by NaOCl - FeCl3 or I2-KI to give a purple colour. Phosphorus pentachloride is chlorinated at 150 °C to give 1-chloronaphthalene, thionyl chloride to give 4-chloro-1-naphthol, or Cl2-CH3COOH to give 2,4-dichloro-1-naphthol. Similarly, bromine produces 2,4-dibromo-1-naphthol, a reaction that can be used in quantitative titrations. Its nitration reaction produces a complex mixture. The crude 2,4-dinitro derivative is used as an acidic yellow dye, comparable to picric acid. Sulfonation at 50 °C readily produced 1-naphthol-2,4-disulfonic acid.
Synthesis Reference(s)
Synthetic Communications, 21, p. 379, 1991 DOI: 10.1080/00397919108016759
Journal of the American Chemical Society, 107, p. 493, 1985 DOI: 10.1021/ja00288a037
General Description
1-Naphthol, a metabolite of carbaryl and naphthanlene. It is formed by spontaneous reaction from (1R, 2S)-Naphthalene epoxide followed to form 1, 4-Dihydroxynaphthalene.
Hazard
Toxic by ingestion and skin absorption.
Flammability and Explosibility
Not classified
Contact allergens
1-Naphthol can be used in dye manufacture and is classified as a hair dye. Combined with epichlorhydrin and NaOH to form alpha-naphthyl glycidyl ether, it caused sensitization in one of three workers in a chemical plant.
Safety Profile
Poison by ingestion and intraperitoneal routes. Moderately toxic by skin contact. An experimental teratogen. Experimental reproductive effects. A severe eye and skin irritant. Mutation data reported. Ingestion of large amounts can cause nephritis, vomiting, diarrhea, circulatory collapse, anemia, convulsions, and death. Can cause kidney irritation and injury to cornea and lens of the eye. Combustible when exposed to heat or flame. When heated to decomposition it emits acrid smoke and irritating fumes.
Synthesis
To a 10 mL pressure vessel, aryl halide (1.00 mmol), copper (I) oxide (0.05 mol), ligand (0.05 mol), 3 M sodium hydroxide (2 mL), and organic solvent (2 mL) were added. The reaction mixture was irradiated at 160 °C for 10 min with strong stirring. The reaction mixture was allowed to cool to room temperature. The reaction mixture was filtered through a plug of celite in a fritted filter funnel and washed with ethyl acetate. The product was extracted using 30 mL of ethyl acetate for three times. The organic extract is washed three times with 10 mL water and two times with 10 mL of brine. The combined organic phases were dried over anhydrous MgSO4 and the solvent was removed under reduced pressure to afford 1-naphthol.
Purification Methods
Sublime 1-naphthol, then crystallise it from aqueous MeOH (charcoal), aqueous 25% or 50% EtOH, *C6H6, cyclohexane, heptane, CCl4 or H2O. Dry it over P2O5 in vacuo. The 4-nitrobenzoate has m 143o (from EtOH). [Shizuka et al. J Am Chem Soc 107 7816 1985, Beilstein 8 H 596, 6 IV 4208.]
1-Naphthol Preparation Products And Raw materials
Raw materials
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View Lastest Price from 1-Naphthol manufacturers
- Product
- 1-Naphthol 90-15-3
- Price
- US $0.00/KG
- Min. Order
- 1KG
- Purity
- 98%min
- Supply Ability
- 30tons/month
- Release date
- 2023-02-02
- Product
- 1-Naphthol 90-15-3
- Price
- US $7.00/kg
- Min. Order
- 1kg
- Purity
- 0.99
- Supply Ability
- 10000
- Release date
- 2024-09-06
- Product
- 1-Naphthol 90-15-3
- Price
- US $10.00/KG
- Min. Order
- 1KG
- Purity
- 99%
- Supply Ability
- 10 mt
- Release date
- 2024-11-26