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Zirconacyclopentadienes reacted with benzal halides in the presence of CuCl
and dimethylpropyleneurea to give pentasubstituted cyclopentadienes in mod
erate to good yields. Treatment of zirconacyclopentadienes with 1,1-dibromo
-1-alken-3-yne and 1,1-dibromo-1,3-alkadiene afforded fulvene derivatives i
n good yields. (C) 2000 Elsevier Science Ltd. All rights reserved.