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。
Rhodium-Catalyzed Synthesis of Silafluorene Derivatives via Cleavage of Silicon−Hydrogen and Carbon−Hydrogen Bonds
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.
Rhodium-Catalyzed Silylative and Germylative Cyclization with Dehydrogenation Leading to 9-Sila- and 9-Germafluorenes: A Combined Experimental and Computational Mechanistic Study
rate constant of dehydrogenative germylation was greater than that of dehydrogenative silylation. Competitive reactions in the presence of 3,3‐dimethyl‐1‐butene indicated that the ratio of dehydrogenative metalation and hydrometalation was affected by reaction temperature when a hydrosilane or hydrogermane precursor was used. Further mechanistic insights of oxidant‐free dehydrogenative silylation, including