Synthesis of azido(trimethylsilyl)acetylene (6) was performed by treating the iodonium salt 5 with highly soluble hexadecyltributylphosphonium azide (QN3) at −40 °C. Although this product is very unstable, it can nevertheless be trapped by the click reaction with cyclooctyne to give the corresponding 1,2,3-triazole, and also directly characterized by 1H- and 13C-NMR data as well as IR-spectra, which were measured in solution at low temperature and in the gas phase. The thermal or photochemical decay of azide 6 leads to cyano(trimethylsilyl)carbene. This is demonstrated not only by quantum chemical calculations, but also by the trapping reactions with the help of isobutene.
叠氮(三甲基
硅基)
乙炔(6)的合成是通过在 -40 °C 下用高溶解性的
十六烷基三丁基
叠氮化
磷(QN3)处理
碘盐 5 而实现的。虽然这种产物非常不稳定,但它可以通过与
环辛炔的点击反应得到相应的
1,2,3-三唑,并直接通过 1H 和 13C-NMR 数据以及红外光谱进行表征,这些数据是在低温溶液中和气相中测量的。
叠氮化物 6 的热衰变或光
化学衰变会产生
氰基(三甲基
硅基)碳烯。不仅量子
化学计算证明了这一点,
异丁烯的捕获反应也证明了这一点。