Tautomeric equilibria of para-bromophenyl substituted arylhydrazones of β-diketones
作者:Kamran T. Mahmudov、Abel M. Maharramov、Rafiga A. Aliyeva、Famil M. Chyragov、Rizvan K. Askerov、Parvin Q. Hasanov、Maximilian N. Kopylovich、Armando J.L. Pombeiro
DOI:10.1016/j.molstruc.2011.10.006
日期:2011.12
5-(4-bromophenylhydrazono)pyrimidine-2,4,6(1 H ,3 H ,5 H )-trione ( 2 ) and ( E )-2-(4-bromophenylhydrazono)-1-phenylbutane-1,3-dione ( 3 ), were prepared by coupling of β-diketone with the respective para -bromophenyldiazonium chloride, and characterized by IR, 1 H and 13 C NMR spectra. The IR and NMR spectral data disclose an effective intramolecular hydrogen bonding in all the cases. The single crystal
摘要 β-二酮、2-(4-溴苯肼)-5,5-二甲基环己烷-1,3-二酮( 1 )、5-(4-溴苯肼)嘧啶-2,4,6(1 H , 3 H ,5 H )-三酮 ( 2 ) 和 ( E )-2-(4-溴苯基肼基)-1-苯基丁烷-1,3-二酮 ( 3 ) 是通过将 β-二酮与各自的对位偶联来制备的溴苯基重氮氯化物,并通过 IR、 1 H 和 13 C NMR 光谱表征。IR 和 NMR 光谱数据揭示了所有情况下的有效分子内氢键。3-(4-bromophenyl-hydrazono)pentane-2,4-dione ( 4 ) 的单晶 X 射线分析证明了分子内共振辅助氢键 (RAHB) 由于六个的平面性而显着增强。参与共振循环的原子。化合物3衍生自不对称的1-苯基丁烷-1,