Process for preparing 6-acetoxy-2-naphthoic-acid and pure 6-hydr

Details Process for preparing 6-acetoxy-2-naphthoic-acid and pure 6-hydr Process for preparing 6-acetoxy-2-naphthoic-acid and pure 6-hydr

1985-02-26

1986-10-21

Lone, Werren B.

Organic compounds -- part of the class 532-570 series

Organic compounds

Carboxylic acid esters

562467, C07C 6708, C07C 69145

Patent

active

046187014

ABSTRACT:
6-Hydroxy-2-naphthoic acid can be selectively acetylated to 6-acetoxy-2-naphthoic acid, in particular in the presence of admixtures of isomeric hydroxy-naphthoic acids, and thus be separated from those isomeric admixtures. The acetylation is affected in aqueous alkaline solution by reaction with acetic anhydride. By hydrolysis of the 6-acetoxy-2-naphthoic acid, a pure 6-hydroxy-2-naphthoic acid is obtained.

REFERENCES:
patent: 4161470 (1979-07-01), Calundann
patent: 4219461 (1980-08-01), Calundann
Butler et al., J. Chem. Soc. 123:1649-1655 (1923), particularly p. 1653.
Lesser et al., Ber. 58:2109-2117 (1925), particularly p. 2116.
Gradenwitz, Ber. 27:2621-2624 (1894), particularly p. 2624.
Miller, Ber. 14:1600-1602 (1881), particularly p. 1602, note 1.

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