Supported dendrimer catalyst
AssigneesDuPont Canada Inc., National Research Council, University of Ottawa
InventorsLeo E. Manzer, Prabhat Arya, Howard Alper, Sheila Christine Bourque, Gary Jefferson
Life of this patent
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Abstract
Dendrimers were directly and covalently attached to solid supports via siloxy bonds. After complexation with transition metals, the dendrimers were used as catalysts. The supported dendrimers were stable and easily separated from the reaction mixture.
Claims26
A supported dendrimer composition comprising a siloxy core and branches emanating from the core, wherein said core is directly and covalently bonded to a solid support.
A process for the preparation of a dendrimer composition supported on a solid support comprising the steps of:
- a. directly attaching a siloxy core group to the solid support by covalent bonding between at least one oxygen on the siloxy group and the surface of the solid support;
- b. directly attaching a linker group to the core group, wherein the linker molecule contains at least two reactive functional groups;
- and
- c. constructing the arms of the dendrimer utilizing the core group as the starting point of the dendrimer.
A process for the preparation of a supported dendrimer composition, wherein a siloxy core is directly and covalently bounded to a solid support comprising the steps of:
- a. constructing the arms of the dendrimer utilizing a core group as the starting point of the dendrimer, wherein the core group is attached via a linker group to a siloxy core group;
- and
- b. directly attaching the siloxy group to the solid support via covalent bonding between at least one oxygen on the siloxy group and the surface of the solid support.
A hydroformylation process comprising reacting an ethylenically unsaturated compound with a source of CO and H2 in the presence of a supported catalyst, wherein the supported catalyst is a supported dendrimer composition comprising a siloxy core and branches emanating from the core, wherein said core is directly and covalently bonded to a solid support.
A process for carbon—carbon bond formation comprising contacting an unsaturated halide of the formula R′—X wherein X is a halogen and R′ is selected from the group consisting of aryl, alkenyl and alkynyl, with a vinylic compound of the formula H2C═CH—R″ wherein R″ is selected from the group consisting of hydrogen, hydrocarbyl, substituted hydrocarbyl, hydrocarbylamino, alkoxy, aryloxy, heterocyclic, carboxy and carboxyester, to produce a compound of the formula R′—CH═CH—R″ in the presence of a supported Pd catalyst, wherein the supported catalyst comprises a supported dendrimer composition comprising a siloxy core and branches emanating from the core, wherein said core is directly and covalently bonded to a solid;
- and optionally wherein the Heck reaction is performed intramolecularly resulting in a cyclic compound where R′ and R″ together form a ring.
Dependencies are inferred from the claim text.