Tetrahedron p. 4161 - 4172 (1995)
Update date:2022-08-04
Topics:
Van Arkel, Bert
Van Der Baan, Juul L.
Balt, Sijbe
Bickelhaupt, Friedrich
De Bolster, Martinus W. G.
Klumpp, Gerhard W.
The synthesis of Costa-type B12 models 1 with a carbon bridge between the equatorial ligand and cobalt has been accomplished by condensation of butanedione monoxime and 2-(ω-functionalized)alkyl-1,3-diaminopropanes 8 followed by complexation with Co(II), introduction of a leaving group and intramolecular alkylation via Co(I) intermediates. The solution structure of intramolecularly alkylated Costa complexes with a bridge of two (1a) or of three (1b) methylene groups was investigated by NMR spectroscopy and compared with that of propyl(iodo) Costa complex 13.
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