Vitamin B12-mediated electrochemical cyclopropanation of styrene

Reactivity trends of surface-confined Co-tetraphenyl porphyrins and vitamin B12 for the oxidation of 2-aminoethanethiol: Comparison with Co-phthalocyanines and oxidation of other thiols

“…2 illustrates a series of cyclic voltammograms recorded on OPG modified with pre-adsorbed layers of different cobalt macrocyclics including substituted cobalt tetraphenylporphyrins, unsubstituted CoTPP and vitamin B 12 . A reversible pair of peaks between À1.2 and À0.6 V that is usually assigned to the Co(II)/Co(I) reversible process [21,[40][41][42][43][44][45][46] is observed for all complexes and pointed with a black arrow. CoT2APP exhibits a signal at ca.…”

“…Vitamin B 12 exhibits two reversible peaks at ca. À0.8 and at À0.25 V which have been assigned to the Co(II)/(I) and Co(III)/(II) reversible transitions [42][43][44]. All peak currents exhibited by the different complexes vary linearly with the potential scan rate, which is typical of surface-confined electroactive species.…”

Electrocatalytical of chlorophenoxycarboxylic acids at a protoporphyrin IX cobalt(III) chloride modified glassy carbon electrode

“…5. Clearly, with increasing concentration of 2,4-D, the peak current of Co(II)/Co(I) increases, which indicates the reaction of the strong nucleophile Co(I) [28,29] and 2,4-D in a catalytic cycle [30]. The subsequent production of Co(II) is accompanied by the reductive dechlorination of 2,4-D.…”

“…Scheme 2-5 are suggested [17,28,29,31,32], with (Prop)Cl = Protroporphyrin IX chloride, ArCl = Aryl chloride, ArH = Benzene, sur = Electrode surface, sol = Solution.…”

Electrochemical catalysis by crosslinked films of cobalt reconstituted myoglobin and poly(l-lysine) in a bicontinuous microemulsion

“…We also reported vitamin B 12 mediated electrochemical reduction of methylene chloride in presence of styrene to give cyclopropyl benzene in quantitative yields in dimethyl formamide. In microemulsions, cyclopropyl benzene and 1-chloro-3-phenyl propane are formed [7].…”