| abstract |
The present invention relates to a method for preparing, by ethylene polymerisation, at least one dialkyl magnesium compound with formula R-(CH 2 -CH 2 ) n -Mg-(CH 2 -CH 2 ) m -R' in which R and R', optionally identical, are aryl, benzyl, allyl or alkyl groups and in which the n and m integers, optionally identical, are mean numbers of the -CH 2 -CH 2 - chain which are greater than 1, said method including a single step of mixing the following components: at least one ligand or a ligand precursor, at least one rare earth salt, at least one dialkyl magnesium compound with formula R-Mg-R', and ethylene, in a medium that enables contact between the components of the above mixture. |