
%0 Journal Article
%A Roy, Jackson W 
%A Thomson, RJ 
%A Mackay.M.F, . 
%T The Stereochemistry of Organmetallic Compounds. XXV. The Stereochemistry of Displacements of Secondary Methanesulfonate and <i>p</i>-Toluene-sulfonate esters by Diphenylphosphide Ions. X-ray Crystal Structure of (5&#945;- Cholestan- 3&#945;-yl)diphenylphosphine Oxide
%J Australian Journal of Chemistry
%D 1985/01/01
%V 38
%N 1
%P 111-118
%K 
%R https://doi.org/10.1071/CH9850111
%U https://www.publish.csiro.au/paper/CH9850111 
%X Reactions of both axial and equatorial cholestan-3&#945;- and -3&#946;-yl mesylates and tosylates with sodium diarylphosphides give cholestanylphosphines in good yield and with complete inversion of stereochemistry. The stereochemistry has been established by an X-ray crystal structure of (5&#945;-cholestan-3&#945;-yl) diphenylphosphine oxide, and a general method for distinguishing between axial and equatorial phosphines based on 31P N.M.R . spectra is presented. The monophosphines were used as ligands in asymmetric hydrogenation, but only low optical yields were obtained. 
