Selective dimerization of terminal alkynes promoted by the cationic actinide compound [(Et2N)3U] [BPh4]. Formation of the alkyne π-complex [(Et2N)2U(C≡CtBu)(η 2-HC=CtBu)][BPh4]

Ji Quan Wang, Aswini K. Dash, Jean Claude Berthet, Michel Ephritikhine, Moris S. Eisen*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

53 Scopus citations

Abstract

The cationic actinide complex [(Et2N)3U]-[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 η2-π-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.

Original languageEnglish
Pages (from-to)2407-2409
Number of pages3
JournalOrganometallics
Volume18
Issue number13
DOIs
StatePublished - 21 Jun 1999
Externally publishedYes

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