
%0 Journal Article
%A Gahan, LR 
%A O'Conner, MJ 
%T Preparation of the hexadentate ligand (&#8211;)<sub>546</sub>-2,2'-[(1,1'-Binaphthalene-2,2' diyl)bis{methylenethio(ethane-1,2-diyl)nitrilomethylidyne}]bisphenol and a study of the stereochemistry of its cobalt(III) complex
%J Australian Journal of Chemistry
%D 1978/03/01
%V 31
%N 3
%P 511-517
%K 
%R https://doi.org/10.1071/CH9780511
%U https://www.publish.csiro.au/paper/CH9780511 
%X The hexadentate ligand (-)546-2,2'-[(1,1'-binaphthalene-2,2'- diyl)bis{methylenethio(ethane-1,2-diyl)-nitrilomethylidyne}]bisphenol (the doubly deprotonated form is abbreviated as nmep) has been prepared in the S-absolute configuration with respect to the binaphthyl group by reactions on 1,1'-binaphthyl-2,2'-dicarboxylic acid of known absolute configuration S that do not involve the asymmetric binaphthyl moiety.     The cobalt(III) complex (+)546-[Co(-)546(nmep)] ClO4 has been prepared by metal exchange of cobalt(II) ions on the zinc(II) complex followed by air oxidation. The preparative method yielded only one isomer. The complex is a uni-univalent electrolyte in nitromethane.     Measurement of 13C spectra in dimethyl[D6] sulfoxide, circular dichroism and ultraviolet/visible spectra in dimethylformamide and Dreiding molecular models indicate that the complex has the &#945;- geometrical structure, and that the optically active binaphthyl group directs the absolute configuration at the dissymmetric cobalt centre to be &#923; (IUPAC) or &#916; (C2). The thiomethyl sulfur atoms have the S-absolute configuration. 
