The invention relates to a technique for preparing aromatic organozinc compounds
and to a composition therefore. This composition constitutes a reactant that can
be used to carry out the synthesis of organozinc compounds, and comprises a cobalt
salt, a zinc salt, a polar aprotic solvent and elemental zinc in divided form,
the elemental zinc being in solid form, the other elements being in a form dissolved
in the solvent. Application to organic synthesis.