Alkylidene complexes of ruthenium containing N-heterocyclic...

Details Alkylidene complexes of ruthenium containing N-heterocyclic... Alkylidene complexes of ruthenium containing N-heterocyclic...

2007-11-13

2007-11-13

Nazario-Gonzalez, Porfirio (Department: 1621)

Organic compounds -- part of the class 532-570 series

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

C548S262200, C556S022000, C556S467000, C526S171000, C526S243000, C526S155000

Reexamination Certificate

active

10630552

ABSTRACT:
Alkylidene complexes of ruthenium containing N-heterocyclic carbene ligands and their use as highly active, selective catalysts for olefin metathesisThe invention relates to a complex of ruthenium of the structural formula I,where X1and X2are identical or different and are each an anionic ligand,R1and R2are identical or different and can also contain a ring, and R1and R2are each hydrogen or/and a hydrocarbon group,the ligand L1is an N-heterocyclic carbene and the ligand L2is an uncharged electron donor, in particular an N-heterocyclic carbene or an amine, imine, phosphine, phosphite, stibine, arsine, carbonyl compound, carboxyl compound, nitrile, alcohol, ether, thiol or thioether,where R1, R2, R3and R4are hydrogen or/and hydrocarbon groups.The invention further relates to a process for preparing acyclic olefins having two or more carbon atoms or/and cyclic olefins having four or more carbon atoms from acyclic olefins having two or more carbon atoms or/and from cyclic olefins having four or more carbon atoms by an olefin metathesis reaction in the presence of at least one catalyst, wherein a complex is used as catalyst and R′1, R′2, R′3and R′4are hydrogen or/and hydrocarbon groups.

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Kocher, “Neue Wege zu N-heterocyclischen Carbenen und deren Metallkomplexen; Anwendungen in der Homogenkatalyse”, Dissertation, Technische Universitat Munchen, 1997, Seiten 31-59; 124-147; 158-173.
Schattenmann, “Neue Katalysatoren fur die Olefin-Metathese”, Dissertation an der Fakultat fur Chemie, Biologie und Geowissenschaft der TU Muchen, 1998, Seiten 157-240; & TU Jahrbuch 1997, Seite 580.
Weskamp, T. et al., Angew Chem. Int. Ed. 37:2490-2493, “A Novel Class of Ruthenium Catalysts for Olefin Metathesis”, 1998.

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