Carbon dioxide fixation by Cp2(η3-allyl)Ti complexes generated from various dienes
作者:Yuan Gao、Satoshi Iijima、Hirokazu Urabe、Fumie Sato
DOI:10.1016/0020-1693(94)03904-6
日期:1994.7
Abstract Cp2(η3-allyl)Ti complexes having a variety of substituents on their allyl moieties were prepared from corresponding dienes, Cp2TiCl2, and Grignard reagents and were subjected to reaction with carbon dioxide. The reaction of CO2 took place in a highly regioselective manner to give a single β, γ-unsaturated carboxylic acid of a few possible regioisomeric products after hydrolytic workup of the
摘要用相应的二烯,Cp2TiCl2和Grignard试剂制备了烯丙基部分具有多种取代基的Cp2(η3-烯丙基)Ti配合物,并使其与二氧化碳反应。CO 2的反应以高度区域选择性的方式进行,在羧酸钛的水解后,产生了几种可能的区域异构体产物的单一的β,γ-不饱和羧酸。例如,2-烷基丁二烯选择性地产生Cp2(η3-1-甲基-2-烷基烯丙基)Ti络合物,发现该络合物以高度区域选择性的方式再次与CO2反应,得到2-甲基-3-亚甲基链烷酸作为唯一产物。烯丙基配体上的一些取代基或它们的官能团阻止了羧酸的形成,这是根据空间和电子因素进行讨论的。不对称