D. Kowalewski, V. Kowalewski
1965
Citations
0
Influential Citations
8
Citations
Journal
Molecular Physics
Abstract
The analysis of the N.M.R. spectra of the 3-nitro 4-hydroxy; 2-chloro 4-dimethylamino; 2,4 dinitro and 2,4 dimethoxybenzaldehydes shows the existence of a long-range coupling between the aldehyde proton and the ring proton in position five. The splitting of the combination lines allows the determination, in magnitude and relative sign, of another long-range coupling in the first three substances and of three simultaneous long-range couplings in the 2,3 dimethoxybenzaldehyde. It was verified that these interactions are temperature independent in the range of 23–200°c which is considered as an indication of the rigid character of the bond between the aldehyde and the ring carbons.