Ir-catalyzed tandem hydroformylation-transfer hydrogenation of olefins with (trans-/cis-)formic acid as hydrogen source in presence of 1,10-phenanthroline
作者:Lei Liu、Han Gao、Shu-Qing Yang、Xiao-Chao Chen、Yong Lu、Ye Liu、Fei Xia
DOI:10.1016/j.jcat.2020.03.008
日期:2020.5
is in great demand but suffering from low yields, poor selectivity and harsh condition. Herein, 1,10-phenanthroline (L1) modified Ir-catalyst proved to exhibit multiple catalysis in terms of FA dehydrogenation, hydroformylation of olefins, and transfer hydrogenation of aldehydes to accomplish the tandem hydroformylation-transfer hydrogenation of olefins with formic acid (FA) as hydrogen source, as the
一锅串联加氢甲酰化还原以从烯烃合成醇的需求量很大,但产率低,选择性差且条件苛刻。在此,证明1,10-菲咯啉(L1)改性的Ir催化剂在FA脱氢,烯烃的加氢甲酰化和醛的转移加氢方面表现出多重催化作用,从而完成了甲酸(FA)对烯烃的串联加氢甲酰化-转移加氢。作为氢源,目标醇和相应的甲酸酯(在醇与FA酯化后获得)的产率为52-70%。在这个序列中,仅在使用FA的反式-与顺-顺式异构体可以通过转移氢化作用实现醛向醇的还原,并大大降低了烯烃的氢化反应,而氢化反应通常发生在高压气态H 2中。无论是在原位FT-IR光谱分析和DFT-计算证实,经L1 -的[Ir(COD)CL] 2催化剂,CIS -FA作为氢化物-配体负责FA的有效脱氢释放ħ 2与CO沿2,和反式FA作为含羰O型配位体对应于醛醇的转移氢化相同的催化条件下进行。