Regiochemical Effects on Molecular Stability: A Mechanochemical Evaluation of 1,4- and 1,5-Disubstituted Triazoles
作者:Johnathan N. Brantley、Sai Sriharsha M. Konda、Dmitrii E. Makarov、Christopher W. Bielawski
DOI:10.1021/ja303147a
日期:2012.6.20
grown from 1,4- as well as 1,5-disubstituted 1,2,3-triazoles. Irradiating acetonitrile solutions of these polymers with ultrasound resulted in the formal cycloreversion of the triazole units, as determined by a variety of spectroscopic and chemical labeling techniques. The aforementioned reactions were monitored over time, and the rate constant for the cycloreversion of the 1,5-disubstituted triazole
不同分子量的聚(丙烯酸甲酯)链是从 1,4- 以及 1,5-二取代的 1,2,3-三唑类化合物中生长出来的。用超声波照射这些聚合物的乙腈溶液会导致三唑单元的正式环回复,这由各种光谱和化学标记技术确定。随着时间的推移监测上述反应,测得 1,5-二取代三唑的环转化的速率常数比 1,4-二取代的同类物大 1.2 倍。这种差异归因于与 1,4-异构体相比,1,5-区域异构体的机械变形能力增加。这种解释得到了计算研究的进一步支持,