The equilibrium mixture of the four diastereoisomers of tris-[(+)-3-acetylcamphorato]cobalt(III) at 60° in C6H6 has been found to contain 45.2 mol% Δ-trans, 31.3 mol% Δ-trans, 16.4 mol% Δ-cis, and 7.0 mol% Δ-cis isomer. These values indicate that, contrary to previous statemenss in the literature, the 3-acylcamphorato ligand exhibits only slight thermodynamic stereoselecttvity in tris complexes. The four isomers have been separated and characterized individually by 1H nmr, ORD, and CD. A study of their CD curvss reveals that a significant vicinal effect is extant in the visible region of the spectrum and that it is roughly additive to the configurational effect.
ASJC Scopus subject areas
- Physical and Theoretical Chemistry
- Inorganic Chemistry