Anomalous Nuclear Overhauser Effects in Carbon-Substituted Aziridines: Scalar Cross-Relaxation of the First Kind
作者:Ilya Kuprov、David M. Hodgson、Johannes Kloesges、Christopher I. Pearson、Barbara Odell、Timothy D. W. Claridge
DOI:10.1002/anie.201410271
日期:2015.3.16
carbon‐substituted aziridines. The origin of these is identified as scalar cross‐relaxation of the first kind, as demonstrated by a complete theoretical description of this relaxation process and by computational simulation of the NOESY spectra. It is shown that this process relies on the stochastic modulation of J‐coupling by conformational transitions, which in the case of aziridines arise from inversion at the
对于碳取代的氮丙啶,描述了无法用偶极交叉弛豫或化学交换解释的异常NOESY交叉峰。这些的起源被认为是第一类的标量交叉松弛,这一弛豫过程的完整理论描述和NOESY光谱的计算仿真证明了这一点。结果表明,该过程依赖于J的随机调制。通过构象转换耦合,在氮丙啶的情况下,这是由于氮中心的反转而引起的。质子之间的标量交叉松弛的观察似乎以前没有关于NOESY光谱的报道。如果不是因为显示它们的成对原子核无法进行这种交换,传统分析将交叉峰指定为相关自旋之间发生的化学交换过程。