control of the reaction times in most cases. Mechanistic studies demonstrated that a slow isomerization is also possible with the gold catalyst at elevated temperatures, but much faster isomerization rates were observed with acidic additives. An observed initiation period for the gold‐catalyzed isomerization indicates that not the homogenous catalyst, but a decomposition product of it may be the catalytically
随后研究了
二苯并环庚烯及其杂芳族类似物的合成中的双键异构化。在
联苯的情况下,碱性添加剂完全阻止了热力学产物的异构化。对于富含电子的分子内杂芳族亲核试剂,仍然可以观察到异构化,但是在大多数情况下,可以通过仔细控制反应时间来获得动力学产物。机理研究表明,
金催化剂在升高的温度下也可能实现缓慢的异构化,但是在酸性添加剂下观察到的异构化速率要快得多。观察到的
金催化异构化的起始阶段表明,不是均相催化剂,而是其分解产物可能是催化活性物质。