Stereochemistry of the formation of π-allylpalladium complexes from dialkylcyclohexa-1,3-dienes
作者:Shin Imaizumi、Toshio Matsuhisa、Yasuhisa Senda
DOI:10.1016/0022-328x(85)88120-1
日期:1985.2
3-diene reacted with a palladium salt to form, in each case, a single isomer of the corresponding π-allylpalladium chloride complexes, while 2-isopropyl-5-methylcyclohexa-1,3-diene gave two stereoisomeric complexes. An excess of diene (diene/Pd = 2.5–3.0) was required to produce a high yield of the complex. The hydrogen atom, which is incorporated onto the terminal carbon of the diene system, is shown
1,4-二甲基-,1-异丙基-4-甲基和1-叔丁基-4-甲基环己-1,3-二烯与钯盐反应,分别形成相应π的单一异构体-烯丙基氯化铝配合物,而2-异丙基-5-甲基环己-1,3-二烯则得到两种立体异构体。为了产生高产率的络合物,需要过量的二烯(二烯/钯= 2.5–3.0)。氢原子被掺入到二烯系统的末端碳原子上,显示出(i)来自过量的二烯,后者又转化为芳族化合物,并且(ii)侵蚀二烯,立体异构体和从与氯化钯部分相同的一侧进行区域选择性。