作者:Stefanie Mayr、Hendrik Zipse
DOI:10.1002/chem.202101905
日期:2021.12.23
Lewis-base catalyzed acylation of aromatic 1,2-ethylenediols with anhydrides depends strongly on the size of the reagents and the π-system of the diol. Steric effects have a larger impact on reactions of primary hydroxyl groups in the 1,2-diol as well as the monoester than those of secondary hydroxyl groups. For sterically demanding anhydrides this flips the selectivity towards secondary alcohols.
路易斯碱催化的芳香族 1,2-乙二醇与酸酐的酰化很大程度上取决于试剂的大小和二醇的π系统。空间效应对1,2-二醇和单酯中伯羟基的反应比仲羟基的影响更大。对于空间要求较高的酸酐,这会将选择性转向仲醇。