derivatives isomerize into 1,2- or 1,6-dihydropyrazines, the rate of this reaction depending among other things on the pH and on the cosolvent. The different chemical and electrochemical preparations of dihydropyrazines are discussed. It is shown that 3,6-dihydro-2,5-diphenylpyrazine and 1,6-dihydro-2,5-diphenylpyrazine are in thermodynamic equilibrium.
几种
吡嗪在碱性氢有机介质中的电
化学还原导致
1,4-二氢吡嗪太容易氧化而无法分离。这些衍
生物异构化为 1,2- 或 1,6- 二氢
吡嗪,该反应的速率取决于 pH 值和助溶剂。讨论了二氢
吡嗪的不同
化学和电
化学制备。结果表明,3,6-二氢-
2,5-二苯基吡嗪和1,6-二氢-
2,5-二苯基吡嗪处于热力学平衡状态。