Recyclable ruthenium catalysts for metathesis reactions
AssigneeZannan Scitech Co., Ltd.
InventorZheng-Yun James Zhan
Life of this patent
Estimating the term…
Abstract
The invention relates to novel carbene ligands and their incorporated monomeric and resin/polymer linked ruthenium catalysts, which are recyclable and highly active for olefin metathesis reactions. It is disclosed that significant electronic effect of different substituted 2-alkoxybenzylidene ligands on the catalytic activity and stability of corresponding carbene ruthenium complexes, some of novel ruthenium complexes in the invention can be broadly used as catalysts highly efficient for olefin metathesis reactions, particularly in ring-closing (RCM), ring-opening (ROM), ring-opening metathesis polymerization (ROMP) and cross metathesis (CM) in high yield. The invention also relates to preparation of new ruthenium complexes and the use in metathesis.
Claims21
A ruthenium catalyst having the following structure I:
- wherein:
- X1 and X2 are the same or different and each selected from electron-withdrawing anionic ligands, wherein X1 and X2 may be linked to each other via carbon-carbon and/or carbon-heteroatom bonds;
- Y is a neutral two-electron donor selected from oxygen, sulfur, nitrogen or phosphorus;
- R is H, halogen atom, alkyl, alkoxy, aryl, aryloxy, alkylcarbonyl, arylcarbonyl, alkoxycarbonyl, aryloxycarbonyl, heteroaryl, carboxyl (RCO2—), cyano, nitro, amido, amino, aminosulfonyl, N-heteroarylsulfonyl, alkylsulfonyl, arylsulfonyl, alkylsulfinyl, arylsulfinyl, alkylthio, arylthio, or sulfonamido group;
- R1 and R2 are each H, Br, I, alkyl, alkoxy, aryl, aryloxy, alkylcarbonyl, arylcarbonyl, alkoxycarbonyl, aryloxycarbonyl, carboxyl, amido, amino, heteroaryl, alkylthio, arylthio, or sulfonamido group;
- R3 is an alkyl, aryl, heteroaryl, alkylcarbonyl, arylcarbonyl, thiocarbonyl, or aminocarbonyl group;
- EWG is an electron withdrawing group and selected from aminosulfonyl, amidosulfonyl, aryloxycarbonyl, or aminocarbonyl;
- and
- L is an electron donating ligand, which may be linked to X1 via carbon-carbon and/or carbon-heteroatom bonds.
Dependencies are inferred from the claim text.