the coordinated vinylarenes. Cyclic α,β‐unsaturated carbonyl compounds such as MeOBQ and N‐phenylmaleimide were especially effective as additives to afford higher yields of the desired terminal acetals. Kinetic experiments indicated that MeOBQ operates as a π‐acceptor ligand for Pd to accelerate the reaction and that the dissociation of a chloride ion from Pd precedes the rate‐determining step.
使用简单的PdCl 2(MeCN)2 /甲氧基
对苯醌(MeOBQ)/ CuCl催化剂体系和1 atm O 2在温和的反应条件下,由各种
乙烯基芳烃和1,2-或1,3-
-二醇合成末端
缩醛氧亲核体对配位的
乙烯基芳烃的反马尔科夫尼科夫亲核攻击。环状α,β-不饱和羰基化合物(例如MeOBQ和N-苯基马来
酰亚胺)作为添加剂特别有效,可提供更高收率的所需末端
缩醛。动力学实验表明,MeOBQ作为Pd的π受体
配体来加速反应,并且
氯离子从Pd上解离之前是速率确定步骤。