Synthesis of Silica-Supported Compact Phosphines and Their Application to Rhodium-Catalyzed Hydrosilylation of Hindered Ketones with Triorganosilanes
作者:Go Hamasaka、Soichiro Kawamorita、Atsuko Ochida、Ryuto Akiyama、Kenji Hara、Atsushi Fukuoka、Kiyotaka Asakura、Wang Jae Chun、Hirohisa Ohmiya、Masaya Sawamura
DOI:10.1021/om800683g
日期:2008.12.22
Solid-supported phosphine ligands silica−SMAPs [silica gel 60N]−SMAP (1a) or [CARiACT Q-10]−SMAP (1b)}, which are composed of a caged, compact trialkylphosphine (SMAP) as a ligand and silica gel (silica gel 60N or CARiACT Q-10) as a support, were synthesized through surface functionalization. The supported phosphines (1a,b) were structurally characterized by solid-state 13C, 29Si, and 31P cross-polarization/magic
固体负载的膦配体二氧化硅-SMAPs [[硅胶60N] -SMAP(1a)或[CARiACT Q-10] -SMAP(1b)},由笼状紧凑的三烷基膦(SMAP)作为配体和二氧化硅组成通过表面官能化合成了凝胶(硅胶60N或CARiACT Q-10)作为载体。通过固态13 C,29 Si和31 P交叉极化/魔角旋转(CP / MAS)NMR光谱学和N 2吸附测量,对负载的膦(1a,b)进行了结构表征。1a,b与[RhCl(cod)] 2的络合固态13 C和31 P CP / MAS NMR光谱学和Rh K边缘X-射线证明,即使在存在过量配体的情况下,也仅提供了单(膦)-铑配合物Silica-SMAP-RhCl(cod)。射线吸收精细结构(XAFS)测量。由[RhCl(C 2 H 4)2 ] 2和1a,b制备的多相催化剂对位阻酮(包括二叔丁基酮)和三有机硅烷(如Et 3 SiH和(t -Bu)Me