The polymerization of MMA catalyzed by bridged lanthanocene amide as single compoent catalyst has been investigated. The polymers obtained were characterized by GPC, FT IR, 1H NMR and DSC. The results indicated that t...The polymerization of MMA catalyzed by bridged lanthanocene amide as single compoent catalyst has been investigated. The polymers obtained were characterized by GPC, FT IR, 1H NMR and DSC. The results indicated that the conversion and the molecular weight decreased with decrease in polymerization temperature. The PMMA obtained was mainly in syndiotactic structure.展开更多
A series of rare-earth metal amides supported by a cyclohexyl-linked bis（β-diketiminato） ligand were synthesized, and theft catalytic activities for hydrophosphonylation of aldehydes and ketones were developed. Rea...A series of rare-earth metal amides supported by a cyclohexyl-linked bis（β-diketiminato） ligand were synthesized, and theft catalytic activities for hydrophosphonylation of aldehydes and ketones were developed. Reaction of [（Me3Si）2N]3RE（ct- C1）Li（THF）3 with the cyclohexyl-linked bis（13-diketimine） H2L （1） （L = Cy[NC（Me）CHC（Me）NAr]2, Cy = cyclohexyl, Ar = 2, 6-i-Pr2C6H3） gave the rare-earth metal amides LREN（SiMe3）2 （RE = Nd（2）, Sin（3）, Dy（4）, Er（5）, Y（6））. All complexes were fully characterized by elemental, spectroscopic and single-crystal X-ray analyses. Investigation of the catalytic properties of the complexes reveals that these complexes exhibited a high catalytic activity towards the hydrophosphonylation of aldehydes and ketones in the presence of a very low loading of rare-earth metal amides （0.1-1 tool%） at room temperature in a short time.展开更多
文摘The polymerization of MMA catalyzed by bridged lanthanocene amide as single compoent catalyst has been investigated. The polymers obtained were characterized by GPC, FT IR, 1H NMR and DSC. The results indicated that the conversion and the molecular weight decreased with decrease in polymerization temperature. The PMMA obtained was mainly in syndiotactic structure.
文摘A series of rare-earth metal amides supported by a cyclohexyl-linked bis（β-diketiminato） ligand were synthesized, and theft catalytic activities for hydrophosphonylation of aldehydes and ketones were developed. Reaction of [（Me3Si）2N]3RE（ct- C1）Li（THF）3 with the cyclohexyl-linked bis（13-diketimine） H2L （1） （L = Cy[NC（Me）CHC（Me）NAr]2, Cy = cyclohexyl, Ar = 2, 6-i-Pr2C6H3） gave the rare-earth metal amides LREN（SiMe3）2 （RE = Nd（2）, Sin（3）, Dy（4）, Er（5）, Y（6））. All complexes were fully characterized by elemental, spectroscopic and single-crystal X-ray analyses. Investigation of the catalytic properties of the complexes reveals that these complexes exhibited a high catalytic activity towards the hydrophosphonylation of aldehydes and ketones in the presence of a very low loading of rare-earth metal amides （0.1-1 tool%） at room temperature in a short time.
