Organic Syntheses by Unknown
page 67 of 106 (63%)
page 67 of 106 (63%)
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rate are essential for a good product.
A large vessel is needed for the reaction, as the nitroso-b-naphthol separates in a finely divided condition and there is some tendency to foam. The final air-dried product is pure except for its moisture content, as is shown by the fact that on drying _in vacuo_ it has a very good melting point. A sample of Kahlbaum's nitroso-b-naphthol melted at 101--105. 3. Other Methods of Preparation Nitroso-b-naphthol has been made by the action of hydroxylamine hydrochloride on b-naphtho-quinone-chlorimide;[1] by the action of sulfuric acid upon a solution of potassium or sodium nitrite and the sodium salt of b-naphthol;[2] by the action of sodium nitrite upon an alcoholic solution of zinc chloride and b-naphthol;[3] by the action of sodium nitrite upon b-naphthol suspended in zinc sulfate solution;[4] by the action of nitrous acid on b-dinaphthol methane;[5] and by the action of nitrosyl sulfate upon the sodium salt of b-naphthol.[6] [1] Ber. 27, 241 (1894). [2] Ber. 8, 1026 (1875); 27, 3076 (1894); J. Chem. Soc. 45, 295 (1884). [3] Ber. 18, 705 (1885). |
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