Oxidation of carbohydrates with the ferrate(VI) ion

Research progress in the electrochemical synthesis of ferrate(VI)

“…The optimum concentration of NaOH was found to be 14 M. Furthermore, the use of KOH gave a higher ferrate(VI) concentration than did NaOH, similar to other results [118,139]. The synthesis carried out at various temperatures (17,23,30,40, and 57 • C) showed the highest ferrate(VI) concentration near 25 • C [138]. Contrary to the results with an iron anode, an increase in current density positively influenced the production of ferrate(VI).…”

“…The work of the latter three groups focused on optimizing conditions that provide the highest current efficiency for electrochemical synthesis of ferrate(VI). There has been a marked increase in new applications of ferrate(VI) , in particular the utilization of ferrate in organic synthesis [22][23][24][25][26], corrosion protection [27] and environmental improvement [28][29][30][31][32]. More recent research on ferrate(VI) also has involved the development of new characterization techniques that allow deeper insight into the reaction mechanisms and properties of ferrate(VI) [45][46][47][48][49][50][51][52][53][54].…”

Conformational aspects of the reaction mechanisms of polysaccharide lyases and epimerases

“…There is.a formal stereochemical difference for the elimination reaction with D-mannuronate and L-guluronate, at least when the two chair conformations are considered [6,13]. In 4C~ D-mannuronate, the C-5 pro- Fig.3.…”

“…AA1 neutralizes the carboxylate ion of uronate residues; AA2 catalyzes abstraction of the C-5 proton, forming an enolate carbanion which may be stabilized by resonance. Subsequently, there is a ,&elimination of the C-4 substituent; the overall two step mechanism is formally an Elcb process [6]. The same' carbanion is formed in the epimerase reaction, but is discharged using another amino acid residue (AA3) to return hydrogen at C-5 with inversion of configuration.…”

Advances in Fe(VI) charge storage

“…Fe(VI) species have been known for over a century, although its chemistry remains relatively unexplored [1][2][3]. Fe(III) compounds had been explored both as cathode [4] and anode [5] materials in electrochemical storage cells, however, higher valent, greater charge capacity, iron salts had not been previously considered, and the fundamental solubility and stability constraints on higher valent iron chemistry were not well established.…”