Carbon-carbon bond formation involving reactions of alkynes with group 9 metals (Ir, Rh, Co): preparation of conjugated olefins.
Stable alkynyl complexes of iridium(III) (L(n)Ir-triple bond-R) that are prepared from the reactions of terminal alkynes readily undergo the intramolecular C-C bond-forming reactions between the alkynyl and adjacent hydrocarbyl ligands to yield conjugated olefins. These reactions are initiated by electrophiles (H(+), Me(+)) that attack the beta carbon of the alkynyl ligand to increase the electrophilicity of the alpha carbon of the alkynyl ligand. The C-C bond is then formed between the alpha carbons of the alkynyl and adjacent hydrocarbyl ligands.
Chin
Chong Shik
CS
Department of Chemistry, Sogang University, Seoul 121-742, Korea.
Won
Gyongshik
G
Chong
Daesung
D
Kim
Mieock
M
Lee
Hyungeui
H