化学
化学位移
肟
环己烷构象
核磁共振谱数据库
碳-13核磁共振
立体化学
谱线
质子核磁共振
核磁共振波谱
药物化学
有机化学
分子
物理化学
氢键
物理
天文
作者
K. Pandiarajan,R. Mohan,Misbah Ul Hasan
标识
DOI:10.1002/mrc.1260240409
摘要
Abstract 13 C NMR spectra have been recorded for eleven piperidin‐4‐one oximes and for seven of them 1 H NMR spectra have been recorded at 270 MHz. The effect of oximation on the NMR chemical shitts is discussed. The conformations of the oximes are also discussed, based on the observed chemical shifts. Although several oximes appear to adopt a chair conformation, in the same manner as the corresponding ketones, the oximes of 3,5‐dimethyl‐2,6‐diarylpiperidin‐4‐ones with cis ‐methyl groups seem to adopt an asymmetric non‐chair conformation. Analysis of the chemical shifts of cis ‐2,6‐dimethylcyclohexanone oxime suggests that this compound also exists in a non‐chair conformation, and not in a chair conformation with two axial methyl groups as suggested previously.
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