Naphthol

Description

Naphthol · CAS 1321-67-1 · C10H8O. UNII 2A71EAQ389. Boiling Point: 288 °C; Boiling Point: 279.00 to 280.00 °C. @ 760.00 mm Hg; Boiling Point: 282.5 °C @760 [mm Hg].

Identification

CAS Registry Number	1321-67-1
PubChem CID	7005
Molecular formula	C10H8O
IUPAC name	naphthalen-1-ol
UNII (FDA)	2A71EAQ389

Computed Descriptors

Molecular Weight	144.17
XLogP3	2.8
Hydrogen Bond Donor Count	1
Hydrogen Bond Acceptor Count	1
Rotatable Bond Count	0
Exact Mass	144.057514874
Monoisotopic Mass	144.057514874
Topological Polar Surface Area	20.2
Heavy Atom Count	11
Formal Charge	0

Physical & Chemical Properties

Boiling Point	288 °C
Boiling Point	279.00 to 280.00 °C. @ 760.00 mm Hg
Boiling Point	282.5 °C @760 [mm Hg]
Melting Point	96 °C
Melting Point	94.00 to 95.00 °C. @ 760.00 mm Hg
Flash Point	153 °C (open cup)
Solubility	In water, 866 mg/L at 25 °C
Solubility	866 mg/L @ 24C (exp)
Density	1.0954 at 98.7 °C/4 °C
Density	1.0989 @ 99°C

Physical description & handling notes

• Large Crystals
• Colorless or yellow solid; [Hawley] Darkens on exposure to light; [Merck Index] Colorless crystalline solid; [MSDSonline]
• Solid
• Yellow monoclinic needles from water
• Colorless prisms (from toluene)
• Phenolic odor

Regulatory Status

Regulatory & Food Contact	CIR / INCI: Cosmetic ingredients (1-Naphthol) -> CIR (Cosmetic Ingredient Review) CIR / INCI: Hair dyeing
GHS notification summary	1.9% (11 / 584)

GHS Hazard Classification

GHS notification summary	1.9% (11 / 584)
Reported hazard statements	H302, H312, H315, H318, H335, H311 (31.8%), H317 (25%), H400 (24.7%)

Documented Uses

• Used to make dyes, intermediates, synthetic perfumes, agrochemicals, drugs, and rubber antioxidants; [HSDB] Used in organic synthesis; [Hawley] Used in photography; in the hide tanning process; in pyrotechnics for black smoke; [IUCLID]
• Leather Tanning and Processing [Category: Industry]
• Photographic Processing [Category: Other]
• For the dyes mordant black 11, acid brown 6; chem int for dye coupling agents for azo dyes
• Manufacture of dyes, intermediates, synthetic perfumes; also in microscopy.
• Production of agrochemicals, such as sevin and carbaryl, drugs, rubber antioxidants, dye intermediates.

Synonyms

1-NAPHTHOL; naphthalen-1-ol; 90-15-3; alpha-naphthol; 1-Naphthalenol; 1-Hydroxynaphthalene; Furro ER; Ursol ERN; Fouramine ERN; Fourrine ERN; Tertral ERN; Basf Ursol ERN; Fourrine 99; Nako TRB; Zoba ERN; alpha-Hydroxynaphthalene

Frequently Asked Questions

What are the CAS number and molecular formula of Naphthol?

CAS 1321-67-1; molecular formula C10H8O; molecular weight — g/mol.

What other names is Naphthol known by?

1-NAPHTHOL, naphthalen-1-ol, 90-15-3, alpha-naphthol, 1-Naphthalenol, 1-Hydroxynaphthalene.

What is the regulatory status of Naphthol?

Documented regulatory listings: CIR / INCI: Cosmetic ingredients (1-Naphthol) -> CIR (Cosmetic Ingredient Review); CIR / INCI: Hair dyeing.

Is Naphthol classified as hazardous?

1.9% of GHS notifications report no hazard classification (11 of 584).

What are the key physical properties of Naphthol?

Boiling Point: 288 °C; Boiling Point: 279.00 to 280.00 °C. @ 760.00 mm Hg; Boiling Point: 282.5 °C @760 [mm Hg]; Melting Point: 96 °C.

Facts on this page are taken from PubChem (US National Library of Medicine) and Wikidata. Grade-specific data — assay, moisture, particle size, packaging, shelf life — is issued per batch on the COA and is not published here.