Substituted pyridine ligands and related water-soluble catalysts
Versatile Group VIII metathesis catalysts, as can be used in a range of polymerization reactions and other chemical methodologies.
1. A Group VIII transition metal compound of a formula
wherein M is a metal selected from a Group VIII transition metal; X 1 and X 2 are independently selected from anionic ligand components; L 1 -L 3 are independently selected from neutral electron donor ligand components, providing one of said L 1 -L 3 components is an N-heterocyclic carbene component and the other said L 1 -L 3 components are independently selected from substituted pyridinyl ligand components, said substituent comprising at least one of an alkoxy moiety and an alkoxycarbonyl moiety; and R 1 -R 2 are independently selected from hydrogen, alkyl, substituted alkyl, cyclic alkyl, substituted cyclic alkyl, alkenyl, substituted alkenyl, cyclic alkenyl, substituted cyclic alkenyl, phenyl and substituted phenyl moieties.
2. The compound of claim 1 wherein at least one of said pyridinyl ligand components comprises a polyalkoxy substituent.
3. The compound of claim 2 wherein said substituent comprises (OCH 2 CH 2 ) n , and n ranges from about 2 to about 100.
4. The compound of claim 1 wherein M is selected from Ru and Os.
5. The compound of claim 4 wherein R 1 is hydrogen and R 2 is phenyl.
6. A metathesis catalyst compound of a formula
wherein X 1 and X 2 are independently selected from anionic ligand components; L 1 -L 3 are independently selected from neutral electron donor ligand components, providing one of said L 1 -L 3 components is an N-heterocyclic carbene component and the other said L 1 -L 3 components are independently selected from substituted pyridinyl ligand components, said substituent comprising at least one of an alkoxy moiety and an alkoxycarbonyl moiety; and R 1 -R 2 are independently selected from hydrogen, alkyl, substituted alkyl, cyclic alkyl, substituted cyclic alkyl, alkenyl, substituted alkenyl, cyclic alkenyl, substituted cyclic alkenyl, phenyl and substituted phenyl moieties.
7. The compound of claim 6 wherein at least one of said pyridinyl ligand components comprises a polyalkoxy substituent.
8. The compound of claim 7 wherein said substituent comprises (OCH 2 CH 2 ) n , and n ranges from about 2 to about 100.
9. The compound of claim 6 wherein said carbene ligand component comprises a 4,5-dihydroimidazolylidene moiety.
10. The compound of claim 9 wherein R 1 is hydrogen and R 2 is phenyl.
11. The compound of claim 6 wherein a said substituent is coupled to said pyridinyl ligand with a triazole moiety.
12. The compound of claim 6 wherein at least one of said pyridinyl ligand component substituents comprises a phosphorylcholine moiety.
13. A reaction system comprising an compound of claim 6 and at least one alkene compound.
14. The system of claim 13 comprising two acyclic alkene compounds, said system for a cross-metathesis reaction.
15. The system of claim 14 comprising a cyclic alkene compound and an acyclic alkene compound, said system for a ring-opening cross-metathesis reaction.
16. The system of claim 13 comprising a cyclic alkene compound, said system for a ring-opening metathesis polymerization reaction.
17. The system of claim 16 wherein said alkene compound is coupled to a substrate.
18. The system of claim 17 wherein said substrate is a nanodimensioned particulate.
19. The system of claim 17 wherein said alkene compound is cross-linked with another said alkene compound coupled to said substrate.
20. The system of claim 19 wherein said nanodimensional particulate comprises a semiconductive, luminescent material.
21. A method of using an N-heterocyclic carbene ruthenium benzylidene catalyst for a ring-opening metathesis reaction in an aqueous medium, said method comprising:
providing a cyclic alkene compound; and
contacting said alkene compound and a catalyst compound of claim 6 , said catalyst compound wherein R 2 is phenyl, said contact for a time sufficient for reaction of said alkene compound, at least one of said alkene and said catalyst compounds in an aqueous medium.
22. The method of claim 19 wherein at least one of said pyridinyl component substituent comprises at least one of an alkoxy moiety and a phosphorylcholine moiety.
23. The method of claim 21 wherein said alkene component is coupled to a substrate component.
24. The method of claim 23 wherein said coupled components are provided in a substantially hydrophobic medium, said catalyst compound in an aqueous medium, said contact for a time sufficient to cross-link said alkene compound.