Abstract 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- 1, 3-cyclopentadienes in a single preparative step. Derivatives of cyclopentadiene, ...
