Aminodiphenylphosphanes: Isotope-induced chemical shifts<sup>1</sup>Δ<sup>14/15</sup>N(<sup>31</sup>P), coupling constants<sup>1</sup><i>J</i>(<sup>31</sup>P,<sup>15</sup>N), and chemical shifts δ<sup>15</sup>N and δ<sup>31</sup>P
作者:Rosalinda Contreras、Jean Michel Grevy、Zureima García-Hernández、Marisol Göizado-Rodriguez、Bernd Wrackmeyer
DOI:10.1002/hc.1083
日期:——
shifts 1Δ14/15N(31P) were determined at natural abundance of 15N by using HEED INEPT experiments. A dependence of 1Δ14/15N(31P) on the substituents at nitrogen was found (alkyl < H < aryl; increasingly negative values). The magnitude and sign of the coupling constants 1J(31P,15N) (positive sign) are dominated by the presence of the lone pair of electrons at the phosphorus atom. The X-ray structural analysis
一系列氨基二苯基膦 1 [Ph2P-N(H)tBu (a), -NEt2 (b), -NiPr2 (c)], 2 [Ph2P-NHPh (a), -NH-2-吡啶 (b), - NH-3-吡啶 (c), -NH-4-吡啶 (d), NH-嘧啶 (e), NH-2,6-Me2-C6H3 (f), NH-3-Me-2-吡啶 (g )], 3 [Ph2P-N(Me)Ph (a), -NPh2 (b)] 和 N-吡咯基二苯基膦 4 (Ph2P-NC4H4) 的制备和 NMR (1H, 13C, 31P, 15N NMR) 光谱研究. 同位素诱导的化学位移 1Δ14/15N(31P) 通过使用 HEED INEPT 实验在 15N 的天然丰度下确定。发现 1Δ14/15N(31P) 依赖于氮上的取代基(烷基 < H < 芳基;负值越来越大)。耦合常数 1J(31P,15N)(正号)的大小和符号由磷原