Hampel F, Clark T, Alsfasser R (2004)
Publication Status: Published
Publication Type: Journal article
Publication year: 2004
Publisher: American Chemical Society
Book Volume: 43
Pages Range: 4663-4673
Journal Issue: 15
DOI: 10.1021/ic0496774
It is a well-established concept that the C-N bond cleavage of carboxamide functions is facilitated by the coordination of a metal ion to the carbonyl oxygen atom. In contrast, the alternative C-N bond activation by coordination of a neutral tertiary carboxamide nitrogen atom has not been studied. We present the first results on the effect of nitrogen pyramidalization in N-coordinated metal complexes on the methanolysis of tertiary carboxamide groups. An analysis of the reactions products obtained from the methanol cleavage of [(N-Acyl-bpa)Cu](2+) (bpa = N,N-bispicolylamine) complexes is presented together with experimental and high-level theoretically calculated structures. The strong effect of different anions on the amide pyramidalization and subsequent C-N-bond cleavage is evaluated. We show that dichloro complexes [(N-Acyl-bpa)CuCl2] have much less activated amide groups than the corresponding triflate species. They should therefore be less reactive. However, [(N-Acyl-bpa)CuCl2] complexes dissociate in solution to give cationic monochloro complexes [(N-Acyl-bpa)Cu(S)Cl](+) (S = solvent molecule). Theoretical calculations show that the amide pyramidalization in the monochloro complexes is equal to that in the corresponding CF3SO3- salts. Consequently, chloro and triflato complexes are cleaved with similar rates and efficiencies. Parallels to and differences in the reactivity of purely organic distorted amides are discussed.
APA:
Hampel, F., Clark, T., & Alsfasser, R. (2004). The activation of tertiary carboxamides in metal complexes: An experimental and theoretical study on the methanolysis of acylated bispicolylamine copper(II) complexes. Inorganic Chemistry, 43(15), 4663-4673. https://doi.org/10.1021/ic0496774
MLA:
Hampel, Frank, Timothy Clark, and Ralf Alsfasser. "The activation of tertiary carboxamides in metal complexes: An experimental and theoretical study on the methanolysis of acylated bispicolylamine copper(II) complexes." Inorganic Chemistry 43.15 (2004): 4663-4673.
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