| http://www.w3.org/ns/prov#value | - STR11## wherein each R' is independently selected from H or alkyl groups having in the range of 1 up to 20 carbon atoms, and X is a halogen,(iv) a metal, M, selected from Li, Na, K or Mg, and(v) a bidentate ligand containing at least one nitrogen atomwherein said contacting is carried out in a substantially anhydrous, non-polar, ethereal solvent system, optionally containing up to 95 volume percen
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