Molecular structure of di-aryl-aldimines by multinuclear magnetic resonance and X-ray diffraction

摘要: The complete 1H, 13C and 15N NMR analyses for a series of 25 diaryl-aldimines containing phenyl, pyridyl, pyrazolone furanyl moieties are described herein. Detailed evaluation substituent chemical shift coupling constant effects showed that interaction between the lone pair carbonyl group or nitrogen 2-substitued pyridines with aldimine hydrogen increases 1JCH value shifts resonance signal this to high frequency, in 1H spectra. X-ray crystal structure analysis substituted aldimines evidenced planarity aryl groups which conjugated CyN double bond. In case N-(2-pyridinemethylene)-1,5 dimethyl-2-phenyl-1,2- dihydro-pyrazol-3-one, two rotamers were observed same unit cell.