Synthesis, characterization and catalytic function of a B12-hyperbranched polymer.
A new hybrid catalyst composed of a vitamin B(12) derivative and a hyperbranched polymer (HBP) was synthesized and characterized by UV-vis and ESR spectroscopy as well as AFM. The B(12)-HBP showed good properties as a homogenous catalyst. The covalently-immobilized B(12) moieties were efficiently solvated and the cobalt centers were accessible for pyridine guests. The B(12)-HBP showed high reactivity to 2-phenethylbromide and increased selectivity for reductive dimerization in the presence of TiO(2) with UV light irradiation.
Tahara
Keishiro
K
Department of Chemistry and Biochemistry, Graduate School of Engineering, Kyushu University, Fukuoka, 819-0395, Japan.
Shimakoshi
Hisashi
H
Tanaka
Akihiro
A
Hisaeda
Yoshio
Y
D002384:Catalysis; D004578:Electron Spin Resonance Spectroscopy; D018625:Microscopy, Atomic Force; D015394:Molecular Structure; D008983:Molybdoferredoxin / Q000737:chemistry; D010777:Photochemistry; D011108:Polymers / Q000138:chemical synthesis / Q000737:chemistry*; D011725:Pyridines / Q000737:chemistry; D013056:Spectrophotometry, Ultraviolet; D014805:Vitamin B 12 / Q000737:chemistry*
D008983:Molybdoferredoxin; D011108:Polymers; D011725:Pyridines; D014805:Vitamin B 12