Phosphine-ligated Ir(III)-complex as a bi-functional catalyst for one-pot tandem hydroformylation-acetalization
作者:Huan Liu、Lei Liu、Wen-Di Guo、Yong Lu、Xiao-Li Zhao、Ye Liu
DOI:10.1016/j.jcat.2019.04.004
日期:2019.5
IrIII-Lewis acid for tandem hydroformylation-acetalization of olefins. The best result was obtained over L5-based IrCl3⋅3H2O catalytic system which corresponded to 97% conversion of 1-hexene along with 92% selectivity to the target acetals free of any additive. The crystal structure of the novel IrIII-complex of IrIII-L4 indicated that the electron-deficient nature of the involved phosphine warranted Ir-center
的的IrCl络合3 ⋅3H 2 O,其缺电子膦(L1 - L6)分别得到具有过渡金属络合物(Ir中的双重功能的双功能催化剂III -P)和Ir III -Lewis酸为串联加氢甲酰化-烯烃的缩醛化。得到最好的结果超过L5系的IrCl 3 ⋅3H 2 ö催化其对应于1-己烯的转化率为97%与92%的选择性,以缩醛释放任何添加剂的目标沿着系统。新颖的铱的晶体结构III -配合物的铱III -L4指出所涉及的膦的电子缺陷性质保证了其在+3价态的Ir中心没有还原,这也用作随后醛的乙缩醛化的路易斯酸催化剂。此外,作为离子膦,L6系的IrCl 3 ⋅3H 2 ö固定在[BMIM] PF的RTIL系统6可以再循环用于6次没有明显的活性损失或金属浸出。