Chiral Chelates with Chiral Ligands. The Stereoisomers of Tris [(+)-3-acetylcamphorato] cobalt(III)

Charles S. Springer; Robert E. Sievers; Binyamin Feibush

doi:10.1021/ic50100a030

Chiral Chelates with Chiral Ligands. The Stereoisomers of Tris [(+)-3-acetylcamphorato] cobalt(III)

Charles S. Springer, Robert E. Sievers, Binyamin Feibush

Research output: Contribution to journal › Article › peer-review

28 Scopus citations

Abstract

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.

Original language	English (US)
Pages (from-to)	1242-1250
Number of pages	9
Journal	Inorganic Chemistry
Volume	10
Issue number	6
DOIs	https://doi.org/10.1021/ic50100a030
State	Published - Jun 1 1971
Externally published	Yes

ASJC Scopus subject areas

Physical and Theoretical Chemistry
Inorganic Chemistry

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title = "Chiral Chelates with Chiral Ligands. The Stereoisomers of Tris [(+)-3-acetylcamphorato] cobalt(III)",

abstract = "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.",

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AU - Springer, Charles S.

AU - Sievers, Robert E.

AU - Feibush, Binyamin

PY - 1971/6/1

Y1 - 1971/6/1

N2 - 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.

AB - 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.

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Chiral Chelates with Chiral Ligands. The Stereoisomers of Tris [(+)-3-acetylcamphorato] cobalt(III)

Abstract

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