Nitrogen heterocyclic carbene ligands and ruthenium catalysts thereof, preparation method therefor and application thereof
AssigneePaimai New Materials (Chengdu) Co., Ltd.
InventorJianxin Chen
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Abstract
Nitrogen heterocyclic carbine ligands and ruthenium catalysts thereof, a preparation method therefor and an application thereof are provided. The structures of the nitrogen heterocyclic carbine ligands are represented by formulas Ia and Ib, respectively, and the corresponding ruthenium catalyst structures are represented by IIa and IIb, respectively. After simultaneously introducing large-steric hindrance and electron-rich groups into the described nitrogen heterocyclic carbine ligand structures, the catalytic activity, stability and application range of the ruthenium complex catalysts thereof are significantly improved.
Claims14
An N-heterocyclic carbene ligand of formula Ia or Ib,
- wherein:
- each of R1, R2, R5 and R6 is independently selected from the group consisting of C1-C20 alkyl or cycloalkyl, C1-C20 alkoxy, and C6-C20 aryl,
- or R1, R2, and N to which they are linked form a first heterocyclic group,
- or R5, R6, and N to which they are linked form a second heterocyclic group,
- or R1, R2, and N to which they are linked form a first heterocyclic group, and R5, R6, and N to which they are linked form a second heterocyclic group;
- each of R3 and R4 is independently selected from the group consisting of substituted or unsubstituted C6-C20 aryl, substituted or unsubstituted C6-C20 aryloxy, and substituted or unsubstituted C2-C20 heterocyclic aryl, wherein at least one of the substituents is selected from the group consisting of C1-C10 alkyl, C1-C10 alkoxy, hydroxyl, thiohydroxyl, ether group, thioether group, keto, aldehyde group, ester group, amino, imino, amido, nitro, carboxyl, disulfide group, carbonate group, isocyanate group, carbodiimide group, alkoxycarbonyl, carbamate group, and halogens.
Dependencies are inferred from the claim text.