Monolith- and Silica-Supported Carboxylate-Based Grubbs–Herrmann-Type Metathesis Catalysts
作者:Jens O. Krause、Said Lubbad、Oskar Nuyken、Michael R. Buchmeiser
DOI:10.1002/adsc.200303037
日期:2003.8
Grubbs–Herrmann catalyst RuCl2(CHPh)(IMesH2)(PCy3) [IMesH2=1,3-bis(2,4,6-trimethylphenyl)-4,5-dihydroimidazol-2-ylidene]. Heterogenization was accomplished by exchange of one chlorine ligand with the polymeric, immobilized silver carboxylates to yield monolith-supported catalysts 4, 5, and 6 as well as silica-supported systems 7, 8 and 9. The actual composition of these heterogenized catalysts was proven
描述了二氧化硅和整料负载的Grubbs-Herrmann型催化剂的合成。将两个可聚合的含羧酸盐的配体exo,exo -7-氧杂硼烷-2-烯-5,6-二羧酸酐和7-氧杂硼烷-2-烯-5-羧酸表面固定在二氧化硅和开环上复分解(ROMP-)衍生的整体式支持物,使用的是“嫁接”技术。的“1第一代Grubbs催化剂”,的RuCl 2(CHPh配合)(PCY 3)2,被用于这些目的。另外,聚(norborn-2-ene- b-exo,exo制备了-降冰片-2-烯-5,6-二羧酸酐)涂覆的二氧化硅60。聚合物负载的酸酐和羧酸盐基团分别转化为相应的单盐和二盐,并与Grubbs-Herrmann催化剂RuCl 2(CHPh)(IMesH 2)(PCy 3)[IMesH 2 = 1,3-bis (2,4,6-三甲基苯基)-4,5-二氢咪唑-2-亚烷基]。异质化是通过将一种氯配体与聚合的固定化羧酸银交换而得到的