互变异构体
化学
计算化学
碳-13核磁共振
分子轨道
自然键轨道
1,2,4-三唑
化学位移
硫醇
溶剂效应
溶剂
密度泛函理论
分子
物理化学
有机化学
作者
El Sayed H. El Ashry,Laila F. Awad,Saied M. Soliman,Mohamed N. Abd Al Moaty,Hazem A. Ghabbour,Assem Barakat
标识
DOI:10.1016/j.molstruc.2017.06.002
摘要
Reaction of 4-amino-3-methyl-1,2,4-triazole-5-thione with some substituted benzaldehydes in presence of catalytic amount of hydrochloric acid afforded the respective Schiff's bases 3a-e. Computational studies using DFT incorporating the B3LYP/6-311G(d,p) level of theory is used to predict the stability of the possible tautomers. Molecular modeling, natural charge calculations, NMR, Frontier molecular orbitals and electronic spectra were investigated. Analysis of the thermodynamic parameters of the thione-thiol tautomeric reactions of these derivatives was used to predict the tautomers stability. The thione tautomer is the most favored form in gas phase and in solution whatever the nature of solvent used. The electronic spectra were assigned based on the TD-DFT calculations. The GIAO NMR chemical shifts correlated well with the experimental data.
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