Synthesis, spectral analysis, X-ray crystal structures and evaluation of chemical reactivity of five new benzoindazole derivatives through experimental and theoretical studies
作者:Layla A. Taib、Hassan M. Faidallah、Zarife Sibel Şahin、Abdullah M. Asiri、Onur Şahin、Muhammad Nadeem Arshad
DOI:10.1016/j.molstruc.2014.07.033
日期:2014.11
Abstract The main purpose of this study was synthesis, X-ray, DFT and spectroscopic investigations of the title compounds (I–V). Five new compounds were synthesized and the detailed experimental results are reported. The crystal and molecular structures of the title compounds have been determined by IR, 1H NMR, 13C NMR and single-crystal X-ray diffraction. Molecular geometries from X-ray experiment
The acid and base catalyzed isomerization of some tricyclic 2-pyrazolines with N-Carbamoyl-, N-thiocarbamoyl- and N-phenyl substituents was investigated. Starting from cis or trans 3-H, 3a-H diastereomers, equilibrium mixtures of cis and tl ans diastereomers were prepared which were separated and subsequently studied by H-1 NMR and C-13 NMR spectroscopy. A mechanism for the isomerization of the pyrazolines is suggested, supported by a deuterium exchange at C-3a.
El-Rayyes, N. R.; Al-Jawhary, A., Journal of Heterocyclic Chemistry, 1986, vol. 23, p. 135 - 140