DFT investigation of the palladium-catalyzed ene-yne coupling.
The mechanism of the recently developed palladium-catalyzed ene-yne coupling has been evaluated by DFT methods. The calculations validate the previously proposed reaction mechanism and explain the stereoselectivity of the reaction (exclusive formation of the E isomer of the disubstituted alkene). Concerning chemoselectivity, the calculations also clarify why the ene-yne coupling is able to dominate over plausible alternative reaction pathways such as alkene homocoupling and alkyne polymerization. The role of the phosphine ligand at various stages of the catalytic cycle has also been delineated.
Henriksen
Signe Teuber
ST
Department of Chemistry, Technical University of Denmark, Building 201, Kemitorvet, DK-2800 Kgs. Lyngby, Denmark.
Tanner
David
D
Skrydstrup
Troels
T
Norrby
Per-Ola
PO
D000475:Alkenes / Q000737:chemistry*; D000480:Alkynes / Q000737:chemistry*; D002384:Catalysis; D003198:Computer Simulation; D008962:Models, Theoretical; D015394:Molecular Structure; D010165:Palladium / Q000737:chemistry*
D000475:Alkenes; D000480:Alkynes; D010165:Palladium