通过钯-钯制备超大体积的环戊二烯(CpAr 5)H(Ar # = 3,5-Me 2 C 6 H 3 (1a); Ar * = 3,5- t Bu 2 C 6 H 3 (1b))。的催化反应茂金属 与芳基溴化物。 核磁共振光谱与具有取代的芳基环的自由旋转的C s对称溶液结构一致。1a的分子结构与先前确定的五苯基环戊二烯,平面Cp环被近似镜平面平分。将BuLi加到1a,b中得到锂盐(CpAr #5)Li(THF)2 (2a)和(CpAr * 5)Li(2b)的收率很高。7 Li NMR光谱的图2a,b表示在溶液中多于一个物种。从中结晶2a甲苯揭示具有[(CpAr #5)2 Li] -和[(THF)Li(CpAr #5)Li(CpAr #5)Li(THF)] +单元交替的无限一维链结构;由于Cp环的空间,锂原子似乎只是松散地固定在适当的位置,其间距比通常的Li-Cp大。7 Li NMR光谱建议在C
Cyclopentadiene and metallocenes, typically zirconocene dichloride, are suitable substrates for multiple arylations with aryl bromides in palladium-catalyzed reactions. Thus, various aryl bromides bearing either an electron-donating or an electron-withdrawing substituent can react with these substrates to afford the corresponding 1,2,3,4,5-pentaaryl-13-cyclopentadienes in a single preparative step. Derivatives of cyclopentadiene. including di- and trisubstituted cyclopentadienes. and indene are arylated in a similar fashion.
Synthesis, structure and solution dynamics of lithium salts of superbulky cyclopentadienyl ligands
作者:Garth R. Giesbrecht、John C. Gordon、David L. Clark、Brian L. Scott
DOI:10.1039/b302258g
日期:——
bromides. NMR spectroscopy was consistent with Cs symmetric solutionstructures with free rotation of the substituted aryl rings. The molecular structure of 1a is similar to that previously determined for pentaphenylcyclopentadiene, with a planar Cp ring bisected by an approximate mirror plane. Addition of BuLi to 1a,b yielded the lithium salts (CpAr#5)Li(THF)2 (2a) and (CpAr*5)Li (2b) in good yield
通过钯-钯制备超大体积的环戊二烯(CpAr 5)H(Ar # = 3,5-Me 2 C 6 H 3 (1a); Ar * = 3,5- t Bu 2 C 6 H 3 (1b))。的催化反应茂金属 与芳基溴化物。 核磁共振光谱与具有取代的芳基环的自由旋转的C s对称溶液结构一致。1a的分子结构与先前确定的五苯基环戊二烯,平面Cp环被近似镜平面平分。将BuLi加到1a,b中得到锂盐(CpAr #5)Li(THF)2 (2a)和(CpAr * 5)Li(2b)的收率很高。7 Li NMR光谱的图2a,b表示在溶液中多于一个物种。从中结晶2a甲苯揭示具有[(CpAr #5)2 Li] -和[(THF)Li(CpAr #5)Li(CpAr #5)Li(THF)] +单元交替的无限一维链结构;由于Cp环的空间,锂原子似乎只是松散地固定在适当的位置,其间距比通常的Li-Cp大。7 Li NMR光谱建议在C