title: Alkyne Semihydrogenation with a Well-Defined Nonclassical Co-H2Catalyst: A H2Spin on Isomerization and E-Selectivity.
abstract: The reactivity of a CoI-H2complex was extended toward the semihydrogenation of internal alkynes. Under ambient temperatures and moderate pressures of H2, a broad scope of alkynes were semihydrogenated using a CoI-N2precatalyst, resulting in the formation of trans-alkene products. Furthermore, mechanistic studies using1H,2H, and para-hydrogen induced polarization (PHIP) transfer NMR spectroscopy revealed cis-hydrogenation of the alkyne occurs first. The Co-mediated alkene isomerization afforded the E-selective products from a broad group of alkynes with good yields and E/Z selectivity.
authors.affiliation: School of Chemical Sciences, University of Illinois at Urbana-Champaign , 600 South Mathews Avenue, Urbana, Illinois 61801, United States.
authors.forename: Kenan
authors.initials: K
authors.lastname: Tokmic
authors.affiliation: School of Chemical Sciences, University of Illinois at Urbana-Champaign , 600 South Mathews Avenue, Urbana, Illinois 61801, United States.
authors.forename: Alison R
authors.initials: AR
authors.lastname: Fout