An amphoteric reactivity of a mixed-valent bis(mu-oxo)dimanganese(III,IV) complex acting as an electrophile and a nucleophile
- 등재 SCIE, SCOPUS
- 발행기관 ROYAL SOC CHEMISTRY
- 발행년도 2016
- 총서유형 Journal
- URI http://www.dcollection.net/handler/ewha/000000122930
- 본문언어 영어
- Published As http://dx.doi.org/10.1039/c5dt04292e
초록/요약
A mixed-valent bis(mu-oxo)dimanganese(III,IV) complex, [(dpaq)Mn-III(O)(2)Mn-IV(dpaq)](+) (1), was prepared by reacting a hydroxomanganese(III) complex, [(dpaq)Mn-III(OH)](+), with hydrogen peroxide in the presence of triethylamine. The mixed-valent bis(mu-oxo)dimanganese(III,IV) complex (1) was well characterised by UV-vis, EPR and CSI-MS techniques. The electrophilic reactivity of 1 was investigated in the oxidation of 2,6-di- tert-butylphenol derivatives by 1, in which the relative rate afforded a good Hammett correlation with a rho value of -1.0. The nucleophilic character of 1 was then investigated in aldehyde deformylation reactions, using 2-phenylpropionaldehyde (2-PPA) and benzaldehyde derivatives as substrates. In contrast to the case of the reaction of 1 with 2,6-di-tert-butylphenol derivatives, a positive rho value of 0.89 was obtained in the Hammett plot, demonstrating that the bis(mu-oxo)-dimanganese(III,IV) complex is an active nucleophilic oxidant. Thus, 1 exhibited an amphoteric reactivity in both electrophilic and nucleophilic oxidative reactions.
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