Dualism of 1,2,4-oxadiazole ring in noncovalent interactions with carboxylic group
作者:Sergey V. Baykov、Marina V. Tarasenko、Artem V. Semenov、Evgeniy A. Katlenok、Anton A. Shetnev、Vadim P. Boyarskiy
DOI:10.1016/j.molstruc.2022.132974
日期:2022.8
A number of cyclohexane and cyclohexene carboxylic acids bearing 1,2,4-oxadiazole substituent were prepared via condensation of amidoximes with anhydrides of corresponding dicarboxylic acids. All prepared compounds were studied via HRMS, 1H and 13C NMR. In addition, for five acids crystalline structures were obtained via X-ray diffraction analysis. Inspection of these X-ray structures revealed two
许多带有 1,2,4-恶二唑取代基的环己烷和环己烯羧酸是通过偕胺肟与相应二羧酸的酸酐的缩合制备的。所有制备的化合物均通过 HRMS、1 H 和13 C NMR 进行研究。此外,通过 X 射线衍射分析获得了五种酸的晶体结构。对这些 X 射线结构的检查揭示了两种先前未描述的恶二唑环和羧基之间的非共价相互作用:O(羧基)···C(恶二唑) 和 O(恶二唑)···C(羧基)。 通过多种理论方法进行计算研究(分子中原子的量子理论、独立梯度模型、自然键轨道、分子静电势和 Kohn-Sham 能量分解分析,以及基于域的局部对-自然轨道耦合-cluster 和 atomic-dipole-moment-corrected Hirshfeld 方法)证明这些相互作用是由堆积效应引起的,并且具有静电和色散性质。