Size-Driven Inversion of Selectivity in Esterification Reactions: Secondary Beat Primary Alcohols
作者:Stefanie Mayr、Marta Marin-Luna、Hendrik Zipse
DOI:10.1021/acs.joc.0c02848
日期:2021.2.19
alcohols carrying large aromatic side chains with anhydrides differing in size and electronic structure have been measured. While primary alcohols react faster than secondary ones in transformations with monosubstituted benzoic anhydride derivatives, relative reactivities are inverted in reactions with sterically biased 1-naphthyl anhydrides. Further analysis of reaction rates shows that increasing substrate
已经测量了路易斯碱介导的带有较大芳族侧链的仲和伯醇与尺寸和电子结构不同的酸酐的路易斯碱介导的酰化作用。尽管伯醇与单取代的苯甲酸酐衍生物的转化反应比仲醇快,但在与空间偏向的1-萘酸酐的反应中,相对反应性却相反。对反应速率的进一步分析表明,增加底物尺寸会导致酰化过程的实际加速,与伯醇相比,仲醇的作用更大。计算结果表明,酰化速率受催化剂环系统与醇和酸酐反应物中DED取代基之间的非共价相互作用(NCI)指导。