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Updated: May 15, 2026

Facile Preparation of (2Z,4E)-Dienamides by the Olefination of Electron-deficient Alkenes with Allyl Acetate
Published on: June 21, 2017
(μ(1)-Methano-lato-κ(1)O)-μ(1)-methoxo-κ(1)O-(μ(2)-2-amino-1-methyl-5H-imidazol-4-one-κ(2)N:N')-hexa-carbonyl-dirheni
M Schutte1, H G Visser, A Roodt
1Department of Chemistry, University of the Free State, PO Box 339, Bloemfontein, 9301, South Africa.
Abstract:
In the title compound, [Re(2)(CH(3)O)(2)(CO)(6)(C(4)H(6)N(3)O)], the two Re(I) atoms are linked by a methoxo and methanolato bridge, as well as by a creatinine ligand that coordinates in a bidentate fashion. Three fac-carbonyl ligands occupy the rest of the slightly distorted octa-hedral geometry around each Re(I) atom. The bridging methanolato and methoxo ligands are bent out of the Re(2)O(2) plane by 49.2 (4) and 47.8 (3)° respectively. This is normally associated with a methanolato-bridging-type coordination rather that the more planar methoxo-type bridging. Furthermore, the creatinine bridging molecule is very slightly distorted from the Re(2)N(2)C plane, indicating that the pyrazolo N atom bonded to the Rh(I) atom is not protonated. Charge balance can thus only be attained if one assumes a positional disorder for the methanolato/methoxo H atom. All attempts to locate disordered protons around these O atoms were unsuccessful. Four hydrogen bonds, one N-H⋯O and three C-H⋯O, are observed in the structure. The mol-ecules pack in a head-to-head and tail-to-tail fashion when viewed along the c axis, in alternating columns.
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