Centre National De La Recherche Scientifique

Ecole Nationale Superieure De Chimie De Rennes

Ifp Energies Nouvelles

Demeta

Mathieu Rouen

Marc Mauduit

Helene Olivier-Bourbigou

Francois Hugues

Frédéric Caijo

Severine Forget

Pierre Queval

Olivier Basle

Fabien Tripoteau

The present invention relates to a method for the polymerization of cycloolefins by ring-opening metathesis. The reaction is carried out in the presence of at least one particular catalyst, selected from the ruthenium alkylidene complexes comprising at least one 1-aryl-3-cycloalkyl-imidazolin-2-ylidene ligand and mixtures thereof. The invention also relates to a kit for implementing this method.

Method for the polymerization of cycloolefins by means of ring-opening metathesis

The invention relates to a ruthenium alkylidene complex comprising a 1-aryl-3-cycloalkyl-imidazolin-2-ylidene ligand, the cycloalkyl group of said 1-aryl-3-cycloalkyl-imidazolin-2-ylidene ligand being a cyclic secondary aliphatic alkyl.

Ruthenium complexes comprising an asymmetrical unsaturated N-heterocyclic diaminocarbene

The invention relates to a process for preparing an asymmetrical imidazolium salt of formula (1A), in which R1 is an aromatic group, R2 is chosen from a cyclic secondary aliphatic alkyl group and a heteroalkyl group, R3 and R4 are chosen, independently of one another, from the group consisting of hydrogen, a halide and an alkyl group, and A&#x2033; is an anion. The process comprises a first substep of forming a reaction mixture by bringing one equivalent of an aniline into contact with one equivalent of a compound bearing an amine group, in the presence of at least four point five equivalents of a Br&#xf8;nsted acid. The process also comprises a second substep of forming a solution comprising one equivalent of a dicarbonyl, one equivalent of formaldehyde, and at least four point five equivalents of the Br&#xf8;nsted acid, and adding thereto the reaction mixture formed in the first substep. The mixture is left to stir for a predetermined time at a predetermined temperature. The intermediate asymmetrical imidazolium salt 1A is then isolated. 

Process for preparing asymmetrical imidazolium salts

This invention describes a process for metathesis of olefins from feedstocks obtained from the Fischer-Tropsch process, using as catalyst a ruthenium alkylidene complex comprising a saturated or unsaturated, dissymmetrical N-heterocyclic carbene (NHC) ligand.

Process for metathesis of olefins obtained from Fischer-Tropsch fractions using a ruthenium complex comprising a dissymmetrical N-heterocyclic diaminocarbene

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La Bouexiere, France

Mathieu Rouen