Heterocycles as ligands. 12. (2,5-(tert-Bu)2C4H2N)2Co: the first diazacobaltocene.
Lithiation of 2,5-di-tert-butylpyrrole with BuLi in THF-PhMe followed by treatment with CoCl2 gave 70% 1,1'-diazacobaltocene I. Oxidn. of I with ferricinium tetrafluoroborate gave the cobalticenium salt. The crystal structure and cyclic voltammetry of I was discussed.
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