Effect of lithium chloride on allylation of zirconacyclopentadienes
作者:Lian Leng、Chanjuan Xi、Chao Chen、Chunbo Lai
DOI:10.1016/j.tetlet.2003.10.217
日期:2004.1
The effects of lithium chloride on the allylation of zirconacyclopentadienes with allylic halides in the presence of CuCl have been studied. It is found that mono-allylation products are formed predominantly in the absence of lithium chloride, while the presence of lithium chloride leads to the formation of di-allylation products. (C) 2003 Elsevier Ltd. All rights reserved.
Dianionic Cycloaddition of Decatetraenes with RCOX Forming Nine-Membered Carbocycles
作者:Chanjuan Xi、Lian Leng、Yongling Shi、Baohua Guo
DOI:10.1055/s-2003-36807
日期:——
2,9-Dilithio-1,4,6,9-decatetraenes, generated from the corresponding dibromo-decatetraenes, were reacted with acyl halides or carboxylic esters to give nine-memberedcarbocycles. The decatetraene precursors were readily prepared from zirconacyclopentadienes and 2,3-dibromopropene in the presence of a catalytic amount of CuCl.