Conformational transformations and autooxidation of 5-bromo-2-(2-methylpropyl)-5-nitro-1,3,2-dioxaborinane
作者:O. Yu. Valiakhmetova、T. V. Tyumkina、E. S. Meshcheryakova、L. M. Khalilov、V. V. Kuznetsov
DOI:10.1134/s1070428017060185
日期:2017.6
barrier to internal rotation of the axial nitro group is several times higher than that for the equatorial nitro group. According to the 1H, 13C, and 11B NMR, IR, and X-ray diffraction data, the main autooxidation products of 5-bromo-2-(2-methylpropyl)-5-nitro-1,3,2-dioxaborinane are 2-bromo-2-nitropropane-1,3-diol and boric acid.
在DFT PBE /3ξ水平上对5-溴-2-(2-甲基丙基)-5-硝基-1,3,2-二氧杂硼烷的构象研究表明,唯一的沙发-沙发相互转化途径是通过对应于2的过渡态实现的,5-捻合构象。轴向硝基基团内部旋转的屏障比赤道硝基基团高出几倍。根据1 H,13 C和11 B NMR,IR和X射线衍射数据,得出5溴-2-(2-甲基丙基)-5-硝基-1,3,2-的主要自氧化产物二氧杂硼烷是2-溴-2-硝基丙烷-1,3-二醇和硼酸。