Highly Strained 2,3-Bridged 2H-Azirines at the Borderline of Closed-Shell Molecules
作者:Klaus Banert、Barbara Meier、Enrico Penk、Biswajit Saha、Ernst-Ulrich Würthwein、Stefan Grimme、Tobias Rüffer、Dieter Schaarschmidt、Heinrich Lang
DOI:10.1002/chem.201002474
日期:2011.1.24
short‐lived 2,3‐bridged 2H‐azirines, or gave secondary products generated from triplet nitrenes. The diverse photoreactivity of 2,3‐bridged 2H‐azirines was also studied by quantum chemical methods (DFT, CCSD(T), CASSCF(6,6)) with respect to the singlet and triplet energy surfaces. The ring‐opening processes leading to the corresponding vinyl nitrenes were identified as key steps for the observed reactivity
取代的1-叠氮基环戊烯和1-叠氮基环己烯被光解生成2,3-桥连的2 H-叠氮基。对于具有六元碳环的桥头叠氮基,可以通过NMR光谱分析进行检测,而即使是具有五元环的动态稳定桥头叠氮基也无法通过低温NMR光谱分析来表征。因此,最新的关于后者杂环的报告已得到纠正。根据取代方式的不同,辐照1-叠氮环戊烯要么生成可以基于短寿命的2,3桥连的2 H-叠氮基来解释的产物,要么生成由三重态亚硝基生成的副产物。2,3-桥联2 H的不同光反应性还通过量子化学方法(DFT,CCSD(T),CASSCF(6,6))对单重态和三重态能级表面研究了叠氮化物。导致相应乙烯基乙烯基的开环过程被确定为观察到的反应性的关键步骤。