1-naphthol

Structural formula
General
Surname	1-naphthol
other names	α-naphthol 1-hydroxynaphthalene Naphth-1-ol
Molecular formula	C 10 H 8 O
Brief description	colorless crystals with a faint phenolic odor
External identifiers / databases
CAS number 90-15-3 EC number 201-969-4 ECHA InfoCard 100.001.791 PubChem 7005 Wikidata Q408876
properties
Molar mass	144.17 g mol −1
Physical state	firmly
density	1.28 g cm −3
Melting point	96 ° C
boiling point	288 ° C
pK s value	9.30 (25 ° C)
solubility	0.1 g l −1 (20 ° C)
safety instructions
GHS hazard labeling from  Regulation (EC) No. 1272/2008 (CLP) , expanded if necessary danger H and P phrases H: 302-311-315-318-335-411 P: 273-280-302 + 352 + 312-305 + 351 + 338 + 310-391
As far as possible and customary, SI units are used. Unless otherwise noted, the data given apply to standard conditions .

1-naphthol (also α-naphthol ) is an organic chemical compound. The structure consists of a naphthalene structure with an attached hydroxyl group  (-OH). It can therefore also be called 1-hydroxynaphthalene. There is another isomer , 2-naphthol (β-naphthol, 2-hydroxynaphthalene).

use

Under the action of a strong acid, such as. B. concentrated sulfuric acid, furfural or 5-hydroxymethylfurfural are formed from pentoses and hexoses by intramolecular dehydration . This condenses with 1-naphthol to form a violet dye ( Molisch sample ).

Individual evidence

1. ↑ ^{a b c d e f g} Entry on 1-naphthol in the GESTIS substance database of the IFA , accessed on January 10, 2017(JavaScript required) .
2. ^ Zvi Rappoport: CRC Handbook of Tables for Organic Compound Identification , Third Edition, CRC Press, Boca Raton, Florida, 1984, ISBN 0-8493-0303-6 .
3. ↑ Entry on 1-naphthol in the Classification and Labeling Inventory of the European Chemicals Agency (ECHA), accessed on August 1, 2016. Manufacturers or distributors can expand the harmonized classification and labeling .