In:
Angewandte Chemie, Wiley, Vol. 130, No. 45 ( 2018-11-05), p. 15099-15103
Abstract:
The formation and detailed spectroscopic characterization of the first biuret‐containing monoanionic superoxido‐Ni II intermediate [LNiO 2 ] − as the Li salt [ 2 ; L=MeN[C(=O)NAr) 2 ; Ar=2,6‐iPr 2 C 6 H 3 )] is reported. It results from oxidation of the corresponding [Li(thf) 3 ] 2 [LNi II Br 2 ] complex M with excess H 2 O 2 in the presence of Et 3 N. The [LNiO 2 ] − core of 2 shows an unprecedented nucleophilic reactivity in the oxidative deformylation of aldehydes, in stark contrast to the electrophilic character of the previously reported neutral Nacnac‐containing superoxido‐Ni II complex 1 , [L′NiO 2 ] (L′=CH(CMeNAr) 2 ). According to density‐functional theory (DFT) calculations, the remarkably different behaviour of 1 versus 2 can be attributed to their different charges and a two‐state reactivity, in which a doublet ground state and a nearby spin‐polarized doublet excited‐state both contribute in 1 but not in 2 . The unexpected nucleophilicity of the superoxido‐Ni II core of 2 suggests that such a reactivity may also play a role in catalytic cycles of Ni‐containing oxygenases and oxidases.
Type of Medium:
Online Resource
ISSN:
0044-8249
,
1521-3757
DOI:
10.1002/ange.v130.45
DOI:
10.1002/ange.201808085
Language:
English
Publisher:
Wiley
Publication Date:
2018
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