Generation and Intermolecular Trapping of 1,2-Diaza-4-silacyclopentane-3,5-diyls in the Denitrogenation of 2,3,5,6-Tetraaza-7-silabicyclo[2.2.1]hept-2-ene: An Experimental and Computational Study
作者:Takeshi Nakamura、Akinobu Takegami、Manabu Abe
DOI:10.1021/jo902714c
日期:2010.3.19
found that silicon and nitrogen atoms have a notable effect on the reactivity of 1,2-diaza-4-silacyclopentane-3,5-diyls. Thus, the singlet state of the diradical was calculated to be much more stable than the corresponding ring-closing product, i.e., 2,3-diaza-5-silabicyclo[2.1.0]pentane, and the triplet state of the diradical. In the present study, derivatives of the diradical were generated experimentally
在我们之前的计算研究中,我们发现硅和氮原子对1,2-二氮杂-4-硅杂环戊烷-3,5-二基的反应性具有显着影响。因此,计算出双自由基的单重态比相应的闭环产物即2,3-二氮杂-5-硅双环[2.1.0]戊烷和双自由基的三重态稳定得多。在本研究中,双自由基的衍生物是在前体偶氮烷(即2,3,5,6-四氮杂-7-硅双环[2.2.1]庚-2-烯)脱氮中通过实验生成的,可以通过以下方法制备将重氮甲硅烷基与4-苯基-1,2,4-三唑-3,5-二酮(PTAD)或4-甲基-1,2,4-三唑-3,5-二酮(MTAD)环加成。双自由基被分子间捕获以提供多环化合物。对模型偶氮烷进行脱氮的计算研究(UB3LYP / 6-31G *)表明,逐步脱氮的活化能为。22 kcal / mol是通过1,4-二氮烯基双自由基中间体生成单线双自由基1,2-二氮杂-4-硅环戊烷-3,5-二基衍生物的热力学途径。脱氮反应的低活化能与在本