作者:Joshua I. Bates、Brian O. Patrick、Derek P. Gates
DOI:10.1039/c0nj00188k
日期:——
Treating an equimolar mixture of R1P(SiMe3)2 (R1 = tBu, Ad, Mes, Me3Si; Ad = 1-adamantyl, Mes = 2,4,6-trimethylphenyl) and R2C(O)R3 (R2:R3 = tBu:H, Ph:Ph, tBu:tBu, tBu:Ph, tBu:Me) with AlCl3 (1 equiv.) affords the corresponding phosphaalkenes R1PCR2R3 as monitored by 31P NMR spectroscopy. This new method was applied to the multigram synthesis of R1PCR2R3 [1a: R1 = tBu, R2 = tBu, R3 = H; 2a: R1 = Ad, R2 = tBu, R3 = H; 3a: R1 = Mes, R2 = tBu, R3 = H; 3b: R1 = Mes, R2 = R3 = Ph] in good isolated yields (1a: 80%; 2a: 57%; 3a: 63%; 3b: 76%). Previously unknown 2a has been fully characterized. The reactivity of 1a and 2a with group 13 Lewis acids was performed in an effort to probe their reactivity and provide a means to structurally characterize these P-alkyl phosphaalkenes. The X-ray crystal structures of 1a·AlCl3, 1a·GaCl3 and 2a·GaCl3 reveal that the tBu substituents are configured in a trans arrangement and the PC bond lengths are as expected (avg. 1.64 Å).
使用等摩尔量的R1P(SiMe3)2(R1 = tBu、Ad、Mes、Me3Si;Ad = 1-金刚烷基,Mes = 2,4,6-三甲基苯基)和R2C(O)R3(R2:R3 = tBu:H、Ph:Ph、tBu:tBu、tBu:Ph、tBu:Me)与AlCl3(1当量)处理,通过31P NMR光谱监测,得到了相应的磷杂烯R1PCR2R3。这种方法被用于多克级合成R1PCR2R3 [1a: R1 = tBu, R2 = tBu, R3 = H; 2a: R1 = Ad, R2 = tBu, R3 = H; 3a: R1 = Mes, R2 = tBu, R3 = H; 3b: R1 = Mes, R2 = R3 = Ph],产率良好(1a: 80%; 2a: 57%; 3a: 63%; 3b: 76%)。先前未知的2a已得到充分表征。为了探究1a和2a与第13族路易斯酸的反应活性并提供结构表征的手段,进行了相关反应。1a·AlCl3、1a·GaCl3和2a·GaCl3的X射线晶体结构显示,tBu取代基呈反式排列,PC键长符合预期(平均1.64 Å)。