
TY  - JOUR
A1  - Gahan, LR 
A1  - O'Conner, MJ 
T1  - 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
JF  - Australian Journal of Chemistry
JO  - Aust. J. Chem.
Y1  - 1978
VL  - 31
IS  - 3
SP  - 511
EP  - 517
KW  - 
UR  - https://doi.org/10.1071/CH9780511 
N2  - 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. 
ER  -

