Synthetic and Spectroscopic Investigations Enabled by Modular Synthesis of Molecular Phosphaalkyne Precursors
作者:Wesley J. Transue、Junyu Yang、Matthew Nava、Ivan V. Sergeyev、Timothy J. Barnum、Michael C. McCarthy、Christopher C. Cummins
DOI:10.1021/jacs.8b09845
日期:2018.12.26
phosphaalkyne conversions are measured to be 56-73% in solution by quantitative 31P NMR spectroscopy. In the case of compound 1-Me, the kinetic profile of its spontaneous unimolecular fragmentation is investigated by an Eyring analysis. The resulting 1-phosphapropyne is directly detected by solution NMR spectroscopy and gas phase rotational microwave spectroscopy. The latter technique allows for the first
据报道,一系列二苯并 7-磷酸降冰片二烯化合物 Ph3PC(R)PA(1-R;A = C14H10,蒽;R = Me、Et、iPr、sBu)能够进行热裂解以生成烷基取代的磷炔(RC≡P)与三苯基膦和蒽相伴。通过用适当的叶立德 Ph3P=CHR(2 当量)处理 ClPA 可以轻松制备这些分子前体。对于甲基、乙基和异丙基取代基,通过定量 31 P NMR 光谱测量溶液中的磷炔转化率为 56-73%。在化合物 1-Me 的情况下,通过 Eyring 分析研究其自发单分子断裂的动力学特征。通过溶液核磁共振光谱和气相旋转微波光谱直接检测得到的 1-磷酸丙炔。后一种技术允许首次测量磷 31 核自旋旋转耦合张量。核自旋-旋转耦合提供了旋转和 NMR 光谱之间的联系,并与化学位移各向异性相关。