Centre National De La Recherche Scientifique

Societe De Conseils De Recherches Et D'applications Scientifiques (s.c.r.a.s.)

Other

Rhodia Fiber & Resin Intermediates

Ipsen Pharma S.a.s.

Centre National De La Recherche Scientifique-cnrs

Ipsen Pharma

Heinz Gornitzka

Guy Bertrand

Jean-Bernard Cazaux

Didier Bourissou

Blanca Martin-Vaca

Anca Dumitrescu

Olivier Guerret

Paolo Burattin

Martin-Vaca Blanca

Hanh Nguyen Ngoc

Christophe Buron

Lutz Stelzig

The invention concerns the use of zinc derivatives of general formula (I) wherein: Lrepresents a group of formula: &#x2014;E(R)(R')(R&#x2033;), &#x2014;E(R) (R&#x2032;) or &#x2014;E(R); E is an atom of group 15; Land Lindependently represent a group of formula: &#x2014;E(R)(R&#x2032;)(R&#x2033;), &#x2014;E(R)(R&#x2032;) or &#x2014;E(R), or together form a chain of formula &#x2014;L&#x2032;&#x2014;A&#x2014;L&#x2032;&#x2014;; A represents a saturated or unsaturated chain comprising one, two or three elements of group 14; L&#x2032;and L&#x2032;independently represent a group of formula &#x2014;E(R)(R&#x2032;) &#x2014;E(R) or &#x2014;E&#x2014;; Eis an element of group 14; Eis an element of group 15; Eis an element of group 16; R, R&#x2032;, R&#x2033;, R, R&#x2032;and Rrepresent various groups, as (co) polymerisation catalysts of cyclic esters 

Use of zinc derivatives as cyclic ester polymerization catalysts

A subject of the present invention is new compounds having a lanthanide and having a tridentate ligand, a process for their preparation and their use in particular as polymerization catalysts.

Polymerization catalysts

The use of stannylenes and germylenes of general formula (I) wherein: M represents a tin or geranium atom; Land Lindependently represent a group of formula: -E(R) (R') (R&#x2033;), -E(R) (R&#x2032;) or -E(R)) or together form a chain of formula -L&#x2032;-A- L&#x2032;; A represents a saturated or unsaturated chain comprising one, two or three elements of group 14; L&#x2032;and L&#x2032;, represent, independently, a group of formula: -E(R) (R&#x2032;)-, E(R)- or -E-; Eis an element of group 14; Eis an element of group 15; Eis an element of group 16; R, R&#x2032;, R&#x2033;, R, R&#x2032;and Rrepresent variable groups as polymerization catalysts of heterocycles.

Use of stannylenes and germylenes as polymerization catalysts for heterocycles

The invention relates to new compounds having an element of group 12 and having a tridentate ligand, a process for their preparation and their use in particular as a polymerization catalyst.

Polymerisation catalysts

Polymerisation catalyst

The invention concerns novel organometallic complexes comprising cationic heterocyclic carbenes. It also concerns a method for preparing said complexes from dicationic heterocyclic precursor compounds. It further concerns the use as catalysts of said organometallic complexes for a certain number of chemical reactions.

Organometallic complexes comprising cationic heterocyclic carbenes

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Pompertuzat, France

Heinz Gornitzka