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

TY - JOUR

T1 - 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]

AU - Wang, Ji Quan

AU - Dash, Aswini K.

AU - Berthet, Jean Claude

AU - Ephritikhine, Michel

AU - Eisen, Moris S.

PY - 1999/6/21

Y1 - 1999/6/21

N2 - 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.

AB - 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.

UR - http://www.scopus.com/inward/record.url?scp=0000383810&partnerID=8YFLogxK

U2 - 10.1021/om980973w

DO - 10.1021/om980973w

M3 - 文章

AN - SCOPUS:0000383810

SN - 0276-7333

VL - 18

SP - 2407

EP - 2409

JO - Organometallics

JF - Organometallics

IS - 13

ER -