Isolation of a Cu–H Monomer Enabled by Remote Steric Substitution of a <i>N</i>-Heterocyclic Carbene Ligand: Stoichiometric Insertion and Catalytic Hydroboration of Internal Alkenes
作者:Timothy G. Carroll、David E. Ryan、Jeremy D. Erickson、R. Morris Bullock、Ba L. Tran
DOI:10.1021/jacs.2c05376
日期:2022.8.3
isolation of a Cu–H monomer for insertion of internal alkenes. This reactivity has not been reported for (NHC)CuH complexes despite their common application in Cu–H-catalyzed hydrofunctionalization. Changing from CHPh2 to CPh3 impacts the relative concentration of Cu–H monomers, rate of alkene insertion, and reaction of a trisubstituted internal alkene. Specifically, for R = CPh3, monomeric (IPr*CPh3)CuH
Mechanistic Studies of Carbonyl Allylation Mediated by (NHC)CuH: Isoprene Insertion, Allylation, and β-Hydride Elimination
作者:Ba L. Tran、Jeremy D. Erickson、Amy L. Speelman、R. Morris Bullock
DOI:10.1021/acs.inorgchem.2c03402
日期:2023.1.9
Cu–H complexes to undergo selective insertion of unsaturated hydrocarbons under mild conditions has rendered them valuable, versatile catalysts. The direct formation of Cu allyl intermediates from unfunctionalized 1,3-dienes and transient Cu hydrides is an appealing strategy for upgrading conjugated diene feedstocks. However, empirical mechanisticstudies of the underlying elementary steps and characterization