Enantiospecific synthesis of a planar chiral fluorenylzirconium ansa-metallocene: synthesis and structures of [1-(9-fluorenyl)- and [1-(1-methyl-9-fluorenyl)-2-(2-indenyl)naphthalene]zirconium dichloride
作者:Robert W. Baker、Michael A. Foulkes、Peter Turner
DOI:10.1039/a910246i
日期:——
an axially chiral fluorenyl ligand, (a-S)-10, which on reaction with ZrCl4 enantiospecifically provides the planar chiral ansa-zirconocene (p-S)-[1-(1-methyl-9-fluorenyl)-2-(2-indenyl)naphthalene]zirconium dichloride, (p-S)-8; single crystal X-ray structures have been determined for the racemic ansa-zirconocene rac-8 and the related Cs-symmetric ansa-zirconocene 7.
Di-lithiation of +ac(R)-1-methyl-9-[2-(2-indenyl)-1-naphthyl]fluorene, +ac(R)-6, generates an axially chiral fluorenyl ligand, (a-S)-10, which on reaction with ZrCl4enantiospecifically提供平面手性柄型-zirconocene(对小号) - [1-(1-甲基- 9-芴基)-2-(2-茚基)萘]二氯化锆,(对小号) - 8 ; 已被确定为外消旋单晶X射线结构安莎-zirconocene外消旋- 8和相关Ç小号-对称安莎-锆茂 7。