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Naphthionic acid : ウィキペディア英語版 | Naphthionic acid
|Section8= }} Naphthionic acid is an aromatic sulfonic acid. It appears as a light grey powder〔''4-Amino-1-naphthalenesulfonic acid;'' MSDS No. 250619; Sigma–Aldrich Chemie GmbH: Steinheim, 29 Dec 2011.〕 and is used in the synthesis of azo dyes such as Rocceline (a. k. a. Solid Red A), during which the amino group of the acid (in the form of a salt) is diazotated and then coupled with, in the case mentioned, β-naphthol. 〔
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