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Separation of the Thorpe−Ingold and Reactive Rotamer Effect by Using the Formation of Bicyclic Aziridinium Ions
European Journal of Organic Chemistry ( IF 2.5 ) Pub Date : 2022-07-26 , DOI: 10.1002/ejoc.202200597
Tim Helbing 1 , Michael Kirchner 2 , Jonathan Becker 2 , Richard Göttlich 3
Affiliation  

A classic, angle dependent Thorpe-Ingold effect in the formation of bicyclic aziridinium ions is presented. Kinetic studies, backed up by SC-XRD and DFT calculations, reveal a linear correlation of the internal angle β with the rate constant k1. Increased angles result in decreased rate constants and vice versa. The cyclic structure of the examined 3-chloropiperidines thereby excludes contribution of the reactive rotamer effect towards this cyclization.

中文翻译:

利用双环氮丙啶离子的形成分离索普-英戈尔德和反应性旋转异构体效应

介绍了形成双环氮丙啶鎓离子的经典、角度相关的索普英戈尔德效应。由 SC-XRD 和 DFT 计算支持的动力学研究揭示了内角β与速率常数k 1的线性相关性。增加的角度导致减少的速率常数,反之亦然。因此,所检查的 3-氯哌啶的环状结构排除了反应性旋转异构体效应对该环化的贡献。
更新日期:2022-07-26
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