Issue 0, 1966

Optically active co-ordination compounds. Part VII. Tris-complexes of (+)-hydroxymethylenecamphor

Abstract

The tris-complexes of (+)-hydroxymethylenecamphorate with chromium(III), cobalt(III), and rhodium(III) have been investigated in detail. The geometrical-optical isomers obtained pure are characterised by studies of electronic, and proton resonance spectra, and Cotton effect. The isomers obtained from cobalt(III) are D-1,2,3-(–)[Co(+hmc)3] and D-1,2,6-(–)-[Co(+hmc)3], while the sole isolable product containing chromium(III) is D-1,2,6-(+)-[Cr(+hmc)3], though an unstable L-isomer may also exist. However, with rhodium(III), the isomers D-1,2,6-(–)-[Hh(+hmc)3] and an L-isomer, probably L-1,2,6(+)-[Rh(+hmc)3] were isolated. A distinction is made between kinetic and thermodynamic control of stereoselectivity in complexes. The absolute configurations of all the isolated isomers of [M(+hmc)3] are given. The variation of optical rotatory power of (–)-[Co(+hmc)3] as a function of solvent is presented, and correlated with properties of the solvent and of the complex, in particular its absorption spectrum.

Article information

Article type
Paper

J. Chem. Soc. A, 1966, 1540-1547

Optically active co-ordination compounds. Part VII. Tris-complexes of (+)-hydroxymethylenecamphor

J. H. Dunlop, R. D. Gillard and R. Ugo, J. Chem. Soc. A, 1966, 1540 DOI: 10.1039/J19660001540

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