The B-N Bond in Some Aminoboranes and an Iminoborane, Studied by<sup>11</sup>B and<sup>15</sup>N NMR Spectroscopy and DFT Methods
作者:Bernd Wrackmeyer
DOI:10.1002/zaac.201500653
日期:2015.11
15N NMR spectra of several aminoboranes (Me2B–NMe2, Cl2B–NMe2, Br2B–NMe2, OCH2CH2OB–NMe2), three N-pyrrolylboranes, and an iminoborane (tBu–B≡N–tBu) was measured. The spin-spin coupling constants 1J(15N, 11B) were resolved at elevated temperatures. In the case of the iminoborane at 105 °C, the coupling constant 1J(14N,11B) = 57 Hz could also be determined from the 11B NMR spectrum [from 15N NMR 1J(15N
测量了几种氨基硼烷(Me2B-NMe2、Cl2B-NMe2、Br2B-NMe2、OCH2CH2OB-NMe2)、三种 N-吡咯基硼烷和一种亚氨基硼烷(tBu-B≡N-tBu)的 15N NMR 光谱。自旋-自旋耦合常数 1J(15N, 11B) 在升高的温度下得到解决。在 105 °C 的亚氨基硼烷的情况下,耦合常数 1J(14N,11B) = 57 Hz 也可以从 11B NMR 光谱 [来自 15N NMR 1J(15N,11B) = 81 Hz] 确定。通常,1J(15N,11B) 的大小与键长 dBN 之间没有相关性。值 1J(15N,11B) 表明 σ 键的变化会影响它们的大小,氮孤对电子的性质非常重要。亚氨基硼烷与 N-杂环卡宾的加合物的计算 NMR 参数,