Rhodium-Catalyzed Synthesis of Silafluorene Derivatives via Cleavage of Silicon−Hydrogen and Carbon−Hydrogen Bonds
摘要:
The rhodium-catalyzed synthesis of silafluorenes from biphenylhydrosilanes is described. This highly efficient reaction proceeds via both Si-H and C-H bond activation, producing only H-2 as a side product. Using this method, a ladder-type bis-silicon-bridged p-terphenyl could also be synthesized.
sila[n]helicenes via dehydrogenativesilylation of C–H bonds. By selecting the proper ligands, the current method provides the ability to prepare unsymmetrical sila[n]helicene derivatives without any oxidants. The resulting sila[6]helicene is a rare example of a five-membered ring-fused [6]helicene, which was isolated as a single pure enantiomer without substituents on the terminal benzene rings.
使用具有(R)-(S)-BPPFA配体的铑催化剂,可通过C-H键的脱氢甲硅烷基化反应有效合成sila [ n ] hellicenes。通过选择合适的配体,当前方法提供了在没有任何氧化剂的情况下制备不对称甲硅烷基[ n ]]烯衍生物的能力。所得的硅[ 6 ]螺旋烯是五元环稠合的[ 6 ]螺旋烯的稀有实例,其被分离为单个纯对映体,末端苯环上没有取代基。