Alpha-naphthol



See under .
either of two isomeric hydroxyl derivatives, C 1 0 H 7 OH, of naphthalene (alpha-naphthol or 1-naphthol and beta-naphthol or 2-naphthol) white or yellowish crystals, with a phenolic odor, that darken on exposure to light: used chiefly in dyes, drugs, perfumes, and insecticides.
Historical Examples

alpha-naphthol for dark reds from Primuline, greys from Diamine blues, Neutral grey, etc.
The Dyeing of Cotton Fabrics Franklin Beech

Practically the only phenol that is used is the beta-naphthol; alpha-naphthol is occasionally used, but not often.
The Dyeing of Cotton Fabrics Franklin Beech

noun
a white crystalline solid having two isomeric forms, alpha-naphthol, used in dyes, and beta-naphthol, used in dyes and as an antioxidant. Formula: C10H7OH

naphthol naph·thol (nāf’thôl’, -thōl’, nāp’-) or naph·tol (-tôl, -tōl)
n.
An organic compound occurring in two isomeric forms, alpha-naphthol and beta-naphthol. Also called naphthalenol.
naphthol
(nāf’thôl’, -thōl’, nāp’-)
A poisonous organic compound occurring in two isomeric forms. Both isomers are important in the manufacture of dyes, and also in making antiseptics, insecticides, and tanning agents. Naphthol consists of a hydroxyl group (OH) attached to naphthalene. Chemical formula: C10H8O.

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