Salalen ligands and organometallic complexes
AssigneeRamot at Tel-Aviv University Ltd.
InventorsMoshe Kol, Konstantin Press, Ad Cohen
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Abstract
Use of homogeneous catalytic systems which include as a pre-catalyst a complex of a Group IV metal and a salalen ligand in the polymerization of alpha-olefins, is disclosed. The alpha-olefin polymers obtained are characterized by controlled levels of tacticity. Also disclosed are novel salalen ligands and novel complexes thereof with Group IV metals.
Claims37
1-61. (canceled)
A process of polymerizing an alpha-olefin, the process comprising contacting the alpha-olefin with a catalyst system which comprises:
- (i) a pre-catalyst comprising a Group IV metal atom and a salalen ligand complexed therewith;
- and
- (ii) a co-catalyst,
- thereby producing a polymer of the alpha-olefin.
A process of preparing a polypropylene characterized by a melting transition temperature of at least 165° C., the process comprising polymerizing propylene in the presence of a catalyst system that comprises a ligand-metal complex.
A polypropylene characterized by a melting transition temperature of at least 168° C. and a PDI lower than 3.
A metal complex having the general formula II*:
- wherein:
- Q is MXp,
- whereas M is a group IV element;
- X is a labile group;
- and p is an integer ranging from 0 to 4;
- B is a bridging moiety being at least 2 carbon atoms in length;
- R is hydrogen, alkyl, cycloalkyl, aryl, heteroaryl and heteroalicyclic, or, alternatively, forms a 5-membered or 6-membered heterocyclic ring with a carbon atom of said bridging moiety;
- and
- R1-R8 are each independently selected from the group consisting of hydrogen, alkyl, cycloalkyl, aryl, halogen, alkoxy, aryloxy, heteroalicyclic, heteroaryl, and nitro, provided that:
- (i) at least one of R1-R4 is independently a rigid bulky group selected from the group consisting of a cycloalkyl and a heteroalicyclic, each having at least 7 carbon atoms;
- (ii) each of R1-R4 is independently a halogen;
- and/or
- (iii) said R forms a 5-membered or 6-membered heterocyclic ring with a carbon atom of said bridging moiety
A compound having the general Formula I*:
- wherein:
- B is a bridging moiety being at least 2 carbon atoms in length;
- R is hydrogen, alkyl, cycloalkyl, aryl, heteroaryl and heteroalicyclic, or, alternatively, forms a 5-membered or 6-membered heterocyclic ring with a carbon atom of said bridging moiety;
- and
- R1-R8 are each independently selected from the group consisting of hydrogen, alkyl, cycloalkyl, aryl, halogen, alkoxy, aryloxy, heteroalicyclic, heteroaryl, and nitro, provided that:
- (i) at least one of R1-R4 is independently a rigid bulky group selected from the group consisting of a cycloalkyl and a heteroalicyclic, each having at least 7 carbon atoms;
- (ii) each of R1-R4 is independently a halogen;
- and/or
- (iii) said R forms a 5-membered or 6-membered heterocyclic ring with a carbon atom of said bridging moiety.
A process of preparing a salalen ligand having the general Formula I:
- wherein:
- B is a bridging moiety being at least 2 carbon atoms in length;
- R is hydrogen, alkyl, cycloalkyl, aryl, heteroaryl and heteroalicyclic, or, alternatively, forms a 5-membered or 6-membered heterocyclic ring with a carbon atom of said bridging moiety;
- and
- R1-R8 are each independently selected from the group consisting of hydrogen, alkyl, cycloalkyl, aryl, halogen, alkoxy, aryloxy, heteroalicyclic, heteroaryl, and nitro,
- whereas:
- (i) at least one of R1-R4 is independently a rigid bulky group selected from the group consisting of a cycloalkyl and a heteroalicyclic, each having at least 7 carbon atoms;
- (ii) each of R1-R4 is independently a halogen;
- and/or
- (iii) said R forms a 5-membered or 6-membered heterocyclic ring with a carbon atom of said bridging moiety,
- the process comprising:
- reacting a diamino compound having the formula R—NH—B—NH2, with a carbonyl-containing compound having the formula:
- to thereby obtain an imino-containing compound of the formula:
- and
- reacting said imino-containing compound with a compound having the formula:
- wherein Z is a leaving group,
- thereby preparing the Salalen ligand.
Dependencies are inferred from the claim text.