Rhodium versus Iridium Catalysts in the Controlled Tandem Hydroformylation-Isomerization of Functionalized Unsaturated Fatty Substrates
作者:Jérémy Ternel、Jean-Luc Couturier、Jean-Luc Dubois、Jean-François Carpentier
DOI:10.1002/cctc.201402783
日期:2015.2
10‐undecenitrile (1) and related unsaturated fatty substrates (H2CCH(CH2)7CH2R; R=CO2Me, CH2Br, CHO) has been studied with rhodium, iridium, ruthenium, and palladium biphephos catalysts. The reactions proceeded effectively with all four systems, with high selectivities for the linear aldehyde (ratio of linear/branched aldehydes=99:1). The biphephos‐bis[chloro(cyclooctadiene)iridium] system showed a non‐optimized
10 undecenitrile(的加氢甲酰化1)和相关的不饱和脂肪酸底物(H 2 CCH(CH 2)7 CH 2 R等R = CO 2 Me中的CH 2 BR,CHO)已经研究了铑,铱,钌,以及二苯醚钯催化剂。该反应在所有四个系统中均有效地进行,对线性醛具有高选择性(线性/支化醛的比率= 99:1)。Biphephos-双[氯(环辛二烯)铱]系统显示出未优化的加氢甲酰化转化频率(TOF HF)为770 h -1,仅比基于铑的系统(TOF HF)低约5倍= 3320 h -1); 钯和钌联苯双酚体系的活性较低(TOF HF分别为210和310 h -1)。通过回收利用,在两种情况下均实现了卓越的生产率(TON≈58000 mol(1 / 1- int)mol(Ir)-1和250 000 mol(1 / 1- int)mol(Rh)-1,其中int=内部烯烃)。这些催化剂使末端烯烃竞争异构