Highly Selective and Practical Alkyne-Alkyne Cross-Coupling Using Cp2ZrBu2 and Ethylene
作者:Zhenfeng Xi、Ryuichiro Hara、Tamotsu Takahashi
DOI:10.1021/jo00119a022
日期:1995.7
Highly selective alkyne-alkyne cross coupling reactions were achieved using Cp(2)ZrBu(2) and ethylene gas. First, alkynes were treated with 1.2 equiv of Cp(2)ZrBu(2) (Negishi reagent) under ethylene gas to give zirconacyclopentenes with high selectivities. Subsequent addition of a second alkyne to the solution of zirconacyclopentenes at 50 degrees C gave unsymmetrical zirconacyclopentadienes selectively. After hydrolysis unsymmetrical dienes were obtained in high yields.
DAVIS A. P.; HUGHES G. J.; LOWNDES P. R.; ROBBINS C. M.; THOMAS E. J.; WH+, J. CHEM. SOC. PERKIN TRANS., 1981, PART 1, NO 7, 1934-1941
作者:DAVIS A. P.、 HUGHES G. J.、 LOWNDES P. R.、 ROBBINS C. M.、 THOMAS E. J.、 WH+