The observed and calculated 1H and 13C chemical shifts of tertiary amines and their N-oxides
作者:Radek Pohl、Martin Dračínský、Lenka Slavětínská、Miloš Buděšínský
DOI:10.1002/mrc.2750
日期:2011.6
A series of model tertiary amines were oxidized in situ in an NMR tube to amine N-oxides and their (1)H and (13)C NMR spectra were recorded. Next, the chemical shifts induced by oxidation (Deltadelta) were calculated using different GIAO methods investigating the influence of the method [Hartree-Fock (HF), Moeller-Plesset perturbation, density functional theory (DFT)], the functional applied in the
在NMR管中将一系列模型叔胺原位氧化为胺N-氧化物,并记录了它们的(1)H和(13)C NMR光谱。接下来,使用不同的GIAO方法计算由氧化引起的化学位移(Δδ),研究该方法的影响[Hartree-Fock(HF),Moeller-Plesset摄动,密度泛函理论(DFT)],该函数在DFT中的应用(B3LYP,BPW,OPBE,OPW91)和使用的基集[6-31G *,6-311G **,6-311 + + G **和6-311 + + G(3df,3pd)]。用HF / 6-311 + + G **和OPBE / 6-311 + + G **方法可获得最佳结果。该计算/实验比较方法用于手性胺N-氧化物-(R)和(S)-农锁骨树素6-N-氧化物的构型预测。