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Encyclopedia Britannica - Main :: FLA-FRA |
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FORMULA . 2-oxy-8-sulphonic From p-naphthol and concen- Sodium salt
(Baeyer's acid) trated sulphuric acid at strong alcohol
5060 C. 2-oxy-6-sulphonic From ,Q-naphthol and concen- Sodium salt
(Schaffer's acid) trated sulphuric at 100 C. alcohol
2-oxy-7-sulphonic By fusion of naphthalene
(F-acid) disul phonic acid with caustic
soda at 200250 C. 2-oxy-3.6-disulphonic Both R- and G-acid from f - The sodium salts separ- (R-acid) naphthol and concentrated ated by crystalliza- sulphuric acid at Ioo tion. R-salt insoluble 110C. in alcohol ; G-salt soluble. 2-oxy-6.8-disulphonic (G-acid) 2-oxy-3.6.8-trisulphonic From A-naphthol and fuming Alkaline solutions show sulphuric acid at 14o16oC. green fluorescence
a-naphthoquinone-oxime, formed by the action of nitrous acid on a-naphthol or of hydroxylamine
Goldschmidt
Schmidt
hydroxylamine
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