作者:Jutzi, Peter、Schwartzen, Karl-Heinz、Mix, Andreas
DOI:——
日期:——
Methylated Dihydropentafulvalenes and Pentafulvalenides from Tetramethylcyclopentadiene Derivatives
作者:Andreas Bauer、Harald Hilbig、Wolfgang Hiller、Ernst Hinterschwepfinger、Frank H. Köhler、Markus Neumayer
DOI:10.1055/s-2001-12769
日期:——
Treatment of tetramethylcyclopentadienyllithium (1Li) with CuCl2 or bromotetramethylcyclopentadiene (4), respectively, as well as reaction of stannylated tetramethylcyclopentadiene with 4 in presence of PdBr2 gave two isomeric octamethyldihydropentafulvalenes (3 and 5), of which 5 was deprotonated to a highly substituted cyclopentadienyl anion. Conversion of 1Li to iodotetramethylcyclopentadiene (7) and reaction of 7 with cyclopentadienyl anion yielded three tautomers of tetramethyldihydropentafulvalene (8a, 8b,and 8c) or exclusively 8a depending on the conditions. The crystal structures of 3 and 8a have been determined, and the isomers of 8 have been converted into the corresponding dianion.