title: Proton-coupled electron transfer in the reduction of carbonyls using SmI2-H2O: implications for the reductive coupling of acyl-type ketyl radicals with SmI2-H2O.
abstract: Samarium diiodide-water (SmI2-H2O) reagents have emerged as some of the most practical systems enabling reduction and reductive cyclizations of ketyl radicals. Recently, this reaction manifold has been extended to acyl-type radicals generated from cyclic polar carboxylic acid derivatives. However, the relationship between the fundamental electron- and proton-transfer steps in the generation of ketyl-type radicals with SmI2-H2O remains unclear. An intriguing scenario involves an initial proton-coupled electron transfer (PCET) mechanism from SmI2-H2O to the carbonyl group. Herein, we calculate with high accuracy bond dissociation free energies (BDFE) for the O-H bond in ketyl radicals in 14 cyclic and acyclic ketone, ester, imide and amide substrates and in anthracene relevant to reductions with SmI2-H2O and quantitatively assess the feasibility of concerted PCET in the reduction of carbonyl groups using SmI2-H2O. Reduction potentials of all substrates have been calculated. The data argue against concerted PCET from SmI2-H2O to carbonyl substrates.
authors.affiliation: Department of Chemistry, Rutgers University, 73 Warren Street, Newark, NJ 07102, USA. michal.szostak@rutgers.edu.
authors.forename: Shicheng
authors.initials: S
authors.lastname: Shi
authors.affiliation: Department of Chemistry, Wroclaw University, F. Joliot-Curie 14, Wroclaw 50-383, Poland.
authors.forename: Roman
authors.initials: R
authors.lastname: Szostak
authors.affiliation: Department of Chemistry, Rutgers University, 73 Warren Street, Newark, NJ 07102, USA. michal.szostak@rutgers.edu.
authors.forename: Michal
authors.initials: M
authors.lastname: Szostak