Gold Catalysis: Deuterated Substrates as the Key for an Experimental Insight into the Mechanism and Selectivity of the Phenol Synthesis
作者:A. Stephen K. Hashmi、Matthias Rudolph、Hans-Ullrich Siehl、Masato Tanaka、Jan W. Bats、Wolfgang Frey
DOI:10.1002/chem.200701795
日期:2008.4.18
influence of neighboring substituents. This is supported by quantum chemical calculations of the intermediates. The lack of exchange of deuterium labels excludes even equilibria with acetylide or vinylidene intermediates and the observed deuterium distribution in the final products is in accord with the NIH-shift reaction. In addition, these findings now explain previously obtained results.
金催化的苯酚合成的第二阶段,即中间芳烃氧化物的开环,遵循一般的酸催化。产物的选择性仅由底物决定,并且可以由中间芳族离子的稳定性来解释。因此,甚至远程取代基也可以用于通过电子影响来控制整个反应的化学选择性,并且它们的影响强于相邻取代基的空间影响。中间体的量子化学计算支持了这一点。氘标记物缺乏交换,甚至没有与乙炔或亚乙烯基中间体的平衡,最终产物中观察到的氘分布与NIH变换反应一致。此外,这些发现现在可以解释先前获得的结果。