Tautomerism in o-hydroxyanilino-1,4-naphthoquinone derivatives: Structure, NMR, HPLC and density functional theoretic investigations
作者:Sujit Bhand、Rishikesh Patil、Yogesh Shinde、Dipali N. Lande、Soniya S. Rao、Laxmi Kathawate、Shridhar P. Gejji、Thomas Weyhermüller、Sunita Salunke-Gawali
DOI:10.1016/j.molstruc.2016.06.026
日期:2016.11
2A crystallizes in monoclinic space group P 2 1 / c . wherein the polymer chain is facilitated via O H⋯O and C H⋯O intermolecular hydrogen bonding. Marginal variations in bond distances in quinonoid and aminophenol moieties render structural flexibility to these compounds those in solution exist as exist in ‘ ortho – para ’ tautomers. 1 H and 13 C NMR spectra in DMSO- d 6 showed two sets of peaks in
摘要 ' Ortho ' ((E)-4-hydroxy-2-(2'-(4'-R)-hydroxyphenyl)-imino)-naphthalen-1(2H)-one) 和 'para ' 的结构和光谱特征(2-(2'-(4'-R)-羟基苯基)-氨基)-1,4-萘醌)邻羟基苯胺基-1,4-萘醌衍生物的互变异构体(RH, 1A; CH 3 , 2A;和- Cl, 3A) 使用 1 H, 13 C, DEPT, gDQCOSY, gHSQCAD NMR, HPLC, 循环伏安法技术结合密度泛函理论进行研究。化合物2A在单斜空间群P 2 1 / c 中结晶。其中聚合物链是通过 OH⋯O 和 CH⋯O 分子间氢键促进的。醌类和氨基苯酚部分中键距的边际变化使这些化合物具有结构灵活性,这些化合物在溶液中存在,如存在于'邻-对'互变异构体中。DMSO-d 6 中的 1 H 和 13 C NMR 谱显示所有化合物都有两组峰;而只有