Another name for hydroxypyridine. 2- and 4-hydroxypyridines are in tautomeric equilibrium between the enol form with a hydroxyl group -OH and the keto form with a carbonyl group C=O, but the equilibrium is biased toward the keto form. Those with the keto structure are called pyridones, and are called α- or γ-pyridones (2- or 4-pyridones) depending on the position of the carbonyl group. 3-Hydroxypyridine does not have a pyridone structure and exists only in the enol form. (Chemical formula) α-pyridone is a needle-shaped crystal obtained by heating pyridine with potassium hydroxide at high temperature. Source: Heibonsha World Encyclopedia, 2nd Edition Information |
ヒドロキシピリジンの別名。2‐および4‐ヒドロキシピリジンは水酸基-OHをもつエノール形とカルボニル基C=Oをもつケト形の互変異性平衡にあるが,平衡は一方的にケト形に片寄っている。ケト形構造のものをピリドンといい,カルボニル基の位置に応じてα‐またはγ‐ピリドン(2‐または4‐ピリドン)とよばれる。3‐ヒドロキシピリジンにはピリドン構造はなく,エノール形のみで存在する。(化学式)α‐ピリドンはピリジンを水酸化カリウムと高温で加熱すると得られる針状結晶。
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