The intramolecular alkoxymercuration of
(E)-5-arylpent-4-en-1-ols indicated that the
regioselectivity is closely related to the Hammett constants of the
para-substituents on the benzene ring. Large solvent effects on
the regioselectivity were also observed. These results were compared
with those of the methoxymercuration of β-methylstyrene analogues.
The regioselectivity is discussed in terms of steric effects as well as
the electronic effects which are suggested by the MO calculation for the
mercurinium ion intermediates.
分子内烷氧
汞化反应(E)-5-芳基-
4-戊烯-1-醇表明,反应的区域选择性与苯环上对位取代基的Hammett常数密切相关。同时,我们也观察到溶剂对区域选择性产生了较大的影响。这些结果与β-
甲基苯乙烯类似物的甲氧基
汞化反应进行了比较。区域选择性不仅讨论了空间效应,还涉及了根据
汞鎓离子中间体的分子轨道计算所提出的电子效应。