Kinetics and Mechanism of the Gold-Catalyzed Intermolecular Hydroalkoxylation of Allenes with Alcohols
作者:Robert J. Harris、Robert G. Carden、Alethea N. Duncan、Ross A. Widenhoefer
DOI:10.1021/acscatal.8b02211
日期:2018.9.7
catalyzed by (IPr)AuOTf in toluene has been evaluated through a combination of kinetic analysis, deuterium labeling studies, and in situ spectral analysis of catalytically active mixtures. These data are consistent with a mechanism involving endergonic conversion of (IPr)AuOTf and 1 to the cationic gold π-allene complex (IPr)Au[η2-H2C═C═CMe2][OTf] (5·OTf), which undergoes outer-sphere addition of 2 followed
通过动力学分析,氘标记研究相结合的方法,对(IPr)AuOTf在甲苯中催化3-甲基-1,2-丁二烯(1)与1-苯基丙烷-1-醇(2)进行加氢烷氧基化反应的机理进行了评估。 ,以及催化活性混合物的原位光谱分析。这些数据与涉及(IPR)AuOTf的吸能转化率和机制一致1与阳离子金π -丙二烯络合物(IPR)的Au [η 2 -H 2 C═C═CMe 2 ] [光学传递函数(5 ·OTF) ,将其外球面添加2,然后快速进行原金属脱金属形成1-(3-甲基-2-丁烯氧基)丙基)苯(3a)作为动力学乘积。与5 ·OTf的形成和消耗相关的微观速率常数具有相似的大小,因此催化加氢烷氧基化反应的动力学行为随丙二烯和醇的相对和绝对浓度而变化。