Selective dimerization of terminal alkynes promoted by the cationic actinide compound [(Et2N)3U][BPh4].: Formation of the alkyne π-complex [(Et2N)2U(CCtBu) (η2-HCCtBu)][BP4]

被引：54

作者：

Wang, JQ

Dash, AK

Berthet, JC

Ephritikhine, M

Eisen, MS ^{[1
]}

机构：

[1] Technion Israel Inst Technol, Dept Chem, IL-32000 Haifa, Israel

[2] CEA Saclay, CNRS URA 331, Serv Chim Mol, DRECAM,DSM, F-91191 Gif Sur Yvette, France

来源：

ORGANOMETALLICS | 1999年 / 18卷 / 13期

关键词：

D O I：

10.1021/om980973w

中图分类号：

O61 [无机化学];

学科分类号：

070301 ; 081704 ;

摘要：

The cationic actinide complex [(Et2N)(3)U]-[BPh4] is an active catalytic precursor for the selective dimerization of terminal alkynes. The regioselectivity is mainly toward the geminal dimer, but for bulky alkyne substituents the unexpected cis dimer is also obtained. Mechanistic NMR studies show that a eta(2)-pi-complex is formed between a terminal alkyne and an uranium-acetylide intermediate. This latter complex has been characterized spectroscopically. A plausible mechanistic scenario is proposed for the dimerization process.

引用

页码：2407 / 2409

页数：3