3-Hydroxy-2-naphthoic acid

3-Hydroxy-2-naphthoic acid

Names
Other names BON acid, β-Hydroxynaphthoic acid
Identifiers
CAS Number	92-70-6
3D model (JSmol)	Interactive image
Beilstein Reference	744100
ChEBI	CHEBI:80383
ChemSpider	6837
EC Number	202-180-8
KEGG	C16212
PubChem CID	7104
RTECS number	QL1755000
UNII	C7S9D784HX
InChI InChI=1S/C11H8O3/c12-10-6-8-4-2-1-3-7(8)5-9(10)11(13)14/h1-6,12H,(H,13,14) Key: ALKYHXVLJMQRLQ-UHFFFAOYSA-N
SMILES C1=CC=C2C=C(C(=CC2=C1)C(=O)O)O
Properties
Chemical formula	C11H8O3
Molar mass	188.18 g·mol−1
Appearance	yellow solid
Melting point	222 °C (432 °F; 495 K)
Hazards
GHS pictograms
GHS signal word	Warning
GHS hazard statements	H302, H312, H317, H319, H361, H371, H402, H412
GHS precautionary statements	P201, P202, P260, P261, P264, P270, P272, P273, P280, P281, P301+312, P302+352, P305+351+338, P308+313
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
Infobox references

3-Hydroxy-2-naphthoic acid is an organic compound with the formula C₁₀H₆(OH)(CO₂H). It is one of the several carboxylic acids derived from 2-naphthol. It is an common precursor to azo dyes and pigments. It is prepared by the Kolbe–Schmitt reaction by carboxylation of 2-naphthol.^[1]

3-Hydroxy-2-naphthoic acid is a precursor to many anilides, e.g. Naphthol AS, which are reactive toward diazonium salts to give deeply colored azo compounds. Azo coupling of 3-hydroxy-2-naphthoic acid gives many dyes as well.

Lithol Rubine BK is one of many dyes made from 3-Hydroxy-2-naphthoic acid. Notice that the coupling occurs adjacent to the hydroxy group.

References