pressure of CO 2 . The treatment of Cp 2 ZrCl 2 with EtMgBr followed by exposure to CO 2 generates zirconacycle 1, which can react with various electrophiles to give a variety of carboxylic acid derivatives. Unsaturated zircona-cycles 2 can also generated from Cp 2 ZrCl 2 , EtMgBr, alkynes, and CO 2 . Complexes 2 react with electrophiles to give α,β-unsaturated acids stereoselectively.
锆环 1 和 2 可以简单地由 Cp 2 ZrCl 2 、EtMgBr 和大气压 CO 2 生成。用 EtMgBr 处理 Cp 2 ZrCl 2 然后暴露于 CO 2 生成
锆石环 1,它可以与各种亲电子试剂反应生成各种
羧酸衍
生物。不饱和
氧化锆循环 2 也可以从 Cp 2 ZrCl 2 、EtMgBr、
炔烃和 CO 2 产生。配合物 2 与亲电试剂反应,立体选择性地生成 α,β-不饱和酸。