Naphthol

Naphthalenol. _{C 10} H ₈ O(144.17). C ₁₀ H ₇ OH. There are two isomers, 1- and 2-naphthol. Both are produced by melting the corresponding naphthalenesulfonic acid in an alkali. 1-naphthol is a sublimable columnar crystal with a melting point of 96 °C and a boiling point of 280 °C. 2-naphthol is a sublimable phyllodes with a melting point of 123 °C and a boiling point of 286 °C. Both are easily soluble in organic solvents such as ethanol, ether, and benzene, but are poorly soluble in water. They dissolve well in aqueous alkali hydroxide solutions as alkaline salts, and turn brown when exposed to light. When naphthol is heated to 350-400 °C in a sealed tube, two molecules undergo dehydration condensation to produce 1- or 2-dinaphthyl ether. They are used as synthetic raw materials for dyes, fragrances, and medicines.

Source: Morikita Publishing "Chemical Dictionary (2nd Edition)" Information about the Chemical Dictionary 2nd Edition

naphthalenol．C₁₀H₈O(144.17)．C₁₀H₇OH．1-および2-ナフトールの2種類の異性体がある．いずれもそれぞれ相当するナフタレンスルホン酸をアルカリ融解して製造される．1-ナフトールは融点96 ℃，沸点280 ℃ の昇華性柱状晶．2-ナフトールは融点123 ℃，沸点286 ℃ の昇華性葉状晶．いずれもエタノール，エーテル，ベンゼンなどの有機溶媒に易溶，水に難溶．水酸化アルカリ水溶液にはアルカリ塩となってよく溶け，また光によって褐色にかわる．ナフトールを封管中350～400 ℃ に加熱すると2分子脱水縮合して，1-または2-ジナフチルエーテルを生じる．染料，香料，医薬品の合成原料に用いられる．

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