Societe Nationale Elf Aquitaine

Emile Perez

Jean Ollivier

Michel Leconte

Francoise Quignard

Jean-Paul Laval

Isabelle Rico

Improved catalytic systems of long active duration, comprising initially (a) a tungsten compound, (b) an organometallic compound and (c) a partially or totally fluorinated organic compound. Process of stabilization of these catalytic systems, comprising dissolving (a) in an organic solvent, contacting (b) with (a), agitation and heating at 0.degree. to 100.degree. C. for 0.5 to 60 minutes, then introduction of (c) into the mixture of (a) and (b). Use of these stabilised catalytic systems for the metathesis of olefins which carry functional groups or do not carry such groups.

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Coulommiers, France

Emile Perez