Author: Dyker, Gerald; Heiermann, Jorg; Miura, Masahiro
Description: The multifold palladium-catalysed arylation is a suitable method for the synthesis of sterically crowded cyclopentadienes bearing up to five ortho-substituted aryl groups. A maximum of four mesitylene groups can be introduced. While penta(para-xylyl)cyclopentadiene and pentakis(2-chlorophenyl)cyclopentadiene exhibit at least six rotamers in the proton NMR spectrum, only two rotamers are registered for the tetra(2-chlorophenyl)cyclopentadiene; the all-trans isomer is identified as the major one both by spectroscopy and by semi-empirical calculations.
Subject headings: CH activation; Cyclopentadienes; Palladium catalysis; Rotamers
Publication year: 2003
Journal or book title: Advanced Synthesis & Catalysis
Find the full text: https://onlinelibrary.wiley.com/doi/abs/10.1002/adsc.200303079
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Serial number: 3356