prov:value
| - Thus, the catalyst system alternatively comprises:(i) a nickel compound,(ii) an organophosphine ligand,(iii) a tertiary-alkyl halide of the structure: ##STR4## 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) optionally, a bidentate ligand containing at least on
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