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.
Claims10
N-heterocyclic carbene ligands, characterized in that the ligands have the structures of formula Ia and Ib, respectively:
- in which 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 and R2 and/or R5 and R6, together with N to which they are linked, each form a 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, 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 or halogens.
Dependencies are inferred from the claim text.