2-HYDROXY-1-NAPHTHOIC ACID Chemical Properties

Melting point:

167 °C (dec.) (lit.)

Boiling point:

283.17°C (rough estimate)

Density 

1.2100 (rough estimate)

refractive index 

1.6400 (estimate)

storage temp. 

Sealed in dry,Room Temperature

form 

powder to crystal

pka

pK1:3.29;pK2:9.68 (20°C)

color 

White to Light red to Green

BRN 

975575

CAS DataBase Reference

2283-08-1(CAS DataBase Reference)

EPA Substance Registry System

1-Naphthalenecarboxylic acid, 2-hydroxy- (2283-08-1)

Safety Information

Hazard Codes 

Xi

Risk Statements 

36/37/38

Safety Statements 

26-36

WGK Germany 

2

TSCA 

Yes

HS Code 

2918199890

MSDS

• Language:English Provider:SigmaAldrich
• Language:English Provider:ALFA

2-HYDROXY-1-NAPHTHOIC ACID Usage And Synthesis

Chemical Properties

2-Hydroxy-1-naphthoic acid [2283-08-1], C11H8O3, Mr 188.17, has a mp of 156 – 157℃ (decomp. to 2-naphthol and CO2). The monosodium salt is unstable in hot aqueous solution. 2- Hydroxy-1-naphthoic acid is decarboxylated by nitrous acid, forming 1-nitroso-2-naphthol, and by diazo salts, forming a 1-azo-2-naphthol. An ethanolic solution of 2-hydroxy-1-naphthoic acid gives a dark blue color with iron(III) chloride. Chlorosulfonic acid at 30℃ gives the 6-sulfonyl chloride derivative.

Uses

?2-Hydroxy-1-naphthoic acid is an intermediate of minor importance in the synthesis of azo dyes.

Production Methods

Treatment of the dried sodium or potassium salt of 2-naphthol with carbon dioxide at 120 C under pressure gives an 80 % yield of product after careful work-up. Solvents such as toluene, tetralin, or diphenyl oxide are patented alternatives.

2-HYDROXY-1-NAPHTHOIC ACID(2283-08-1)Related Product Information

• 3-HYDROXY-2-NAPHTHOIC ACID,2-HYDROXY-3-NAPHTHOIC ACID
• Pamoic acid
• METHYL 2-TRIFLUOROMETHANESULFONYLOXY-1-NAPHTHOATE
• 2-HYDROXY-1-NAPHTHOIC ACID
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• 6-Hydroxy-1-naphthoic acid
• Pigment Red 48:2
• Pamoic acid disodium salt
• 1,4-dihydroxy-2naphthoic acid methyl ester
• 6-Hydroxy-2-naphthoic acid
• 1-METHYL-2-(2-[2-THIENYL]ETHENYL)-1,4,5,6-TETRAHYDROPYRIMIDINE COMPOUND WITH 4,4'-METHYLENEBIS(3-HYDROXY-2-NAPHTHOIC ACID)
• 2-HYDROXY-3-NAPHTHOIC ACID ANILIDE PHOSPHATE
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• 2-HYDROXY-3-NAPHTHOIC ACID M-NITROANILIDE
• 1-METHYL-2-[3-HYDROXYPHENYLETHENYL]-1,4,5,6-TETRAHYDROPYRIMIDINE COMPOUND WITH 4,4'-METHYLENEBIS[3-HYDROXY-2-NAPHTHOIC ACID]
• Pigment Red 48:1
• 2-HYDROXY-1-NAPHTHOIC ACID METHYL ESTER
• 2-HYDROXY-3-NAPHTHOIC ACID PHENYL ESTER