PROCESS OF SYNTHESIS Of a RARE EARTH ORGANOPHOSPHATE AND ITS USE FOR the PREPARATION Of a SYSTEM CAL

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The invention relates to a process for preparing a rare-earth organophosphate in the form of a fluid or not very viscous solution that can be used as is for the preparation of a “preformed” catalyst system intended, in particular, for the cis-1, 4 stereospecific polymerization of conjugated dienes.