- 作者: 李傳珍,楊雅甄,林孝道,陳麗純
- 作者服務機構: Department of Applied Chemistry, Providence University, Sha-Lu, Taichung Hsien 433, Taiwan, R.O.C.
- 中文摘要:
The substituent-induced chemical shifts (SCS) of C2 and C3 on the 13C NMR spectra of 1-aryl-3,3-difluoro-2-halocyclopropenes were studied. The correlation between SCS and Hammett constants shows that the tendency of effect by the substituents on the phenyl ring is BrC2(D = 4.66) > ClC2(D = 4.50) and ClC3(D = -1.63) > BrC3(D = -1.41). The DSP treatment further confirms the SCS of C2 and C3 are the main contribution of the resonance effect and field effect, respectively. Those results of the incremental shifts reveals that the gem-difluorocyclopropenyl bearing the phenyl group possesses a triple bond character, which is also observed in IR spectra with high
- 英文摘要: --
- 中文關鍵字: 3,3-Difluorocyclopropenes; Carbon-13; PM3 study; SCS; Hammett constants.
- 英文關鍵字: --