Collect. Czech. Chem. Commun. 1993, 58, 2936-2943

Asymmetric Cobaltacarboranes [6,6'-μ-R-S(1,7-C2B9H10)2-2-Co] with a Monosulfur Bridge between Ligands and HPLC Resolution of the Enantiomers

Jaromír Plešeka, Bohumír Grünera, Jiří Fuseka and Hana Votavováb

a Institute of Inorganic Chemistry, Academy of Sciences of the Czech Republic, 25068 Řež near Prague, Czech Republic
b Institute of Organic Chemistry and Biochemistry, Academy of Sciences of the Czech Republic, 166 10 Prague 6, Czech Republic


On treatment of the [2-Co-(1,7-C2B9H11)2- ion with elemental sulfur and AlCl3 only the racemic form of the [6,6'-μ-S(1,7-C2B9H10)2-2-Co] ion is obtained in high yield. Methylation of this ion proceeds at the sulfur bridge giving rise to the zwitterionic complex [6,6'-μ-MeS(1,7-C2B9H10)2-2-Co]. Constitution of both species has been established by high-field NMR methods and confirmed by resolution to enantiomers by HPLC on chiral stationary phase.