Activation of Carbon Dioxide by Electrogenerated Superoxide Ion:  A New Carboxylating Reagent

Green electrochemistry. Examples and challenges

“…•-and CO 2 Casadei et al [13][14] have recently reported an indirect synthesis of carbamides that involves electrochemically generated superoxide and CO 2 . Superoxide generated at the cathode subsequently converts NH protic amines to carbamides, and primary or secondary alcohols to carbonates.…”

“…Examples cited [13,14] included R = H or CH 3 or Ph, and R′ = PhCH 2 or cyclohexyl or C 6 H 4 OCH 3 . Linear carbamides were produced by bubbling O 2 and CO 2 into a 0.1 M solution of TEAP in acetonitrile (MeCN) using a divided cell.…”

New insight into electrochemical behavior of copper complexes and their applications as bifunctional electrocatalysts for CO2 activation

“…Heterogeneous or homogeneous electrocatalysts, such as Schiff base complexes, have been used to resolve this problem [11,12]. Moreover, among the possible activators of CO 2 , more attention has been paid to superoxide radical anions, O 2 À [13,14]. The O 2 À produced by the electroreduction of O 2 in aprotic solvents activates CO 2 to yield peroxydicarbonate anions, C 2 O 6 2À [13,14].…”

“…Moreover, among the possible activators of CO 2 , more attention has been paid to superoxide radical anions, O 2 À [13,14]. The O 2 À produced by the electroreduction of O 2 in aprotic solvents activates CO 2 to yield peroxydicarbonate anions, C 2 O 6 2À [13,14]. Peroxydicarbonate has been used as a carboxylating reagent for synthesis of organic carbamates and carbonates from amines and alcohols, respectively [13][14][15].…”

“…The O 2 À produced by the electroreduction of O 2 in aprotic solvents activates CO 2 to yield peroxydicarbonate anions, C 2 O 6 2À [13,14]. Peroxydicarbonate has been used as a carboxylating reagent for synthesis of organic carbamates and carbonates from amines and alcohols, respectively [13][14][15]. The aim of the present work was to study the effects of ligand structure on the stability of the reduced forms of copper Schiff base complexes by comparing the electrochemical behavior of [N,N 0 -bis (2-R-phenyl-salicylidenaminato)Cu(II)] complexes and [N,N 0 -bis (salicylaldimine)propylenediimino Cu(II)] complex.…”