The catalytic system of[2-(2-benzimidazolyl)-6-((1-aryliminoethyl)pyridyl)]nickel chloride/MAO(methylalu- minoxane)was found to be good active for vinyl polymerization of norbornene and provided polymers with relative...The catalytic system of[2-(2-benzimidazolyl)-6-((1-aryliminoethyl)pyridyl)]nickel chloride/MAO(methylalu- minoxane)was found to be good active for vinyl polymerization of norbornene and provided polymers with relative narrow molecular distributions.Various reaction parameters,such as the ratios of nickel precursor to MAO or monomer norbornene, and the nature of the ligands in complexes were carefully investigated to realize their effects on the catalytic activities, polymer molecular weight and molecular we...展开更多
This feature article summarizes the synthesis of novel olefin block copolymers using fast syndiospecific living homo- and copolymerization of propylene, higher 1-alkene, and norbornene with ansa-fluorenylamidodimethyl...This feature article summarizes the synthesis of novel olefin block copolymers using fast syndiospecific living homo- and copolymerization of propylene, higher 1-alkene, and norbornene with ansa-fluorenylamidodimethyltitanium- based catalyst according to the authors＇ recent results. The catalytic synthesis of monodisperse polyolefin and olefin block copolymer was also described using this living system.展开更多
The title compound rac-11-t-butoxy-l,4-dihydro-l,4-methanoanthracene （C19H200, Mr = 264.35） has been synthesized and characterized by FT-IR, 1H NMR, HRMS spectra and single-crystal X-ray diffraction. The crystal bel...The title compound rac-11-t-butoxy-l,4-dihydro-l,4-methanoanthracene （C19H200, Mr = 264.35） has been synthesized and characterized by FT-IR, 1H NMR, HRMS spectra and single-crystal X-ray diffraction. The crystal belongs to monoclinic, space group P21/n, with a = 13.5240（10）, b = 8.3453（6）, c = 13.9604（9） A,β = 100.0190（10）°. The structure of the title compound comprises a norbornene unit with a t-butoxy g, roup, having a naphthalene ring fused on one side. The naphthalene is essentially planar with a maximum deviation of 0.032（2） A for atom C（3）. In the crystal, inversion-related molecules are linked by pairs of C- H...O hydrogen bonds, forming a cyclic dimer with R2z （16） graph-set motif. The C-H-..~r interactions are also observed, linking the molecules into a continuous two-dimensional framework structure.展开更多
文摘The catalytic system of[2-(2-benzimidazolyl)-6-((1-aryliminoethyl)pyridyl)]nickel chloride/MAO(methylalu- minoxane)was found to be good active for vinyl polymerization of norbornene and provided polymers with relative narrow molecular distributions.Various reaction parameters,such as the ratios of nickel precursor to MAO or monomer norbornene, and the nature of the ligands in complexes were carefully investigated to realize their effects on the catalytic activities, polymer molecular weight and molecular we...
文摘This feature article summarizes the synthesis of novel olefin block copolymers using fast syndiospecific living homo- and copolymerization of propylene, higher 1-alkene, and norbornene with ansa-fluorenylamidodimethyltitanium- based catalyst according to the authors＇ recent results. The catalytic synthesis of monodisperse polyolefin and olefin block copolymer was also described using this living system.
基金supported by the National Science Council(No.NSC 99-21 13-M-035-001-MY2)Feng Chia University in Taiwan
文摘The title compound rac-11-t-butoxy-l,4-dihydro-l,4-methanoanthracene （C19H200, Mr = 264.35） has been synthesized and characterized by FT-IR, 1H NMR, HRMS spectra and single-crystal X-ray diffraction. The crystal belongs to monoclinic, space group P21/n, with a = 13.5240（10）, b = 8.3453（6）, c = 13.9604（9） A,β = 100.0190（10）°. The structure of the title compound comprises a norbornene unit with a t-butoxy g, roup, having a naphthalene ring fused on one side. The naphthalene is essentially planar with a maximum deviation of 0.032（2） A for atom C（3）. In the crystal, inversion-related molecules are linked by pairs of C- H...O hydrogen bonds, forming a cyclic dimer with R2z （16） graph-set motif. The C-H-..~r interactions are also observed, linking the molecules into a continuous two-dimensional framework structure.
