Enhanced Hydrogenation Activity and Recycling of Cationic Rhodium Diphosphine Complexes through the Use of Highly Fluorous and Weakly-Coordinating Tetraphenylborate Anions
作者:Joep van den Broeke、Elwin de Wolf、Berth-Jan Deelman、Gerard van Koten
DOI:10.1002/adsc.200202205
日期:2003.5
the anion on the performance of ionic rhodium catalysts has received little attention. Herein it is shown that the use of highly fluorous tetraphenylborate anions can enhance catalyst activity in both conventional and fluorous media. For hydrogenation catalysts of the type [Rh(COD)(dppb)][X] COD=1,5-cis,cis-cyclooctadiene; dppb=1,4-bis(diphenylphosphino)butane; X=BF4− (1a), [BPh4]− (1b), [BC6H4(SiMe3)-4}4]−
阴离子性质对离子铑催化剂性能的影响很少受到关注。在此表明,使用高氟四苯基硼酸根阴离子可以增强常规和氟介质中的催化剂活性。对于[Rh(COD)(dppb)] [X]类型的氢化催化剂,COD = 1,5-顺式,顺式-环辛二烯;dppb = 1,4-双(二苯基膦基)丁烷; X = BF 4 - (1A),[BPH 4 ] - (1B),[B C 6 H ^ 4(森达3)-4} 4 ] - (1C),[B C 6 H ^ 3(CF 3)2 -3,5} 4 ] -(1d),[B C 6 H 4(SiMe 2 CH 2 CH 2 C 6 F 13)-4} 4 ] -(1e),[B C 6 H 4(C 6 F 13)-4} 4 ] -(1f)和[B C 6 H 3(C 6 F 13)2 -3,5} 4 ]- (1克)}向在丙酮1-辛烯的加氢活性的顺序增加1C < 1B < 1E < 1A <