An HMO study of the azo-hydrazone tautomerism in diazonium coupling products of 5-isoxazolones
作者:Cyril Párkányi、Ahmad S. Shawali
DOI:10.1002/jhet.5570170511
日期:1980.7
The HMO method has been used to study tautomerism in 3-substituted 4-arylazo-5-isoxazolones (2), the possible tautomeric structures being 2a-2d. Also the common anions of these tautomers, 6, have been theoretically studied. In addition to the free molecules, HMO calculations have been carried out for structures with hydrogen bonds to protic solvents, for tautomers with intramolecular hydrogen bonds
HMO方法已用于研究3取代的4-芳基偶氮-5-异恶唑酮(2)中的互变异构现象,可能的互变异构结构为2a-2d。还对这些互变异构体6的常见阴离子进行了理论研究。除游离分子外,还对与质子溶剂具有氢键的结构,具有分子内氢键的互变异构体以及通过分子间氢键形成的二聚体进行了HMO计算。在所有这些情况下,form形式2a已经证明是最稳定的。还研究了芳基偶氮部分中给电子和吸电子取代基对各种互变异构体稳定性的诱导作用。根据HMO计算得出的结果与Summers及其同事的实验数据完全吻合。数米-和p -取代的4-芳基偶氮-3-甲基-5- isoxazolones已被合成和它们的光谱数据和熔点的报道。