200120-11-2Relevant articles and documents
Organic-inorganic hybrid polymer-encapsulated magnetic nanobead catalysts
Arai, Takayoshi,Sato, Toru,Kanoh, Hirofumi,Kaneko, Katsumi,Oguma, Koichi,Yanagisawa, Akira
, p. 882 - 885 (2008)
A new strategy for the encapsulation of magnetic nanobeads was developed by using the in situ self-assembly of an organic-inorganic hybrid polymer. The hybrid polymer of {[Cu-(bpy)(BF4)2(H2O) 2](bpy)}n (bpy = 4,4′-bipyridine) was constructed on the surface of amino-functionalized magnetic beads and the resulting hybrid-polymer-encapsulated beads were utilized as catalysts for the oxidation of silyl enolates to provide the corresponding α-hydroxy carbonyl compounds in high yield. After the completion of the reaction, the catalyst was readily recovered by magnetic separation and the recovered catalyst could be reused several times. Because the current method did not require complicated procedures for incorporating the catalyst onto the magnetic beads, the preparation and the application of various other types of organic-inorganic hybrid-polymer-coated magnetic beads could be possible.
A bronsted acid catalyst for the enantioselective protonation reaction
Cheol, Hong Cheon,Yamamoto, Hisashi
supporting information; body text, p. 9246 - 9247 (2009/02/02)
A highly reactive and robust chiral Bronsted acid catalyst, chiral N-triflyl thiophosphoramide, was developed. The first metal-free Bronsted acid catalyzed enantioselective protonation reaction of silyl enol ethers was demonstrated using this chiral Bronsted acid catalyst. The catalyst loading could be reduced to 0.05 mol % without any deleterious effect on the enantioselectivity. Copyright
Catalytic synthesis of α-hydroxy ketones using organic-inorganic hybrid polymer
Arai, Takayoshi,Takasugi, Hitomi,Sato, Toru,Noguchi, Hiroshi,Kanoh, Hirofumi,Kaneko, Katsumi,Yanagisawa, Akira
, p. 1590 - 1591 (2007/10/03)
Oxidation of silyl enolates was found to be smoothly catalyzed by [Cu(bpy)(BF4)2(H2O)2(bpy)] n (bpy = 4,4′-bipyridine) under molecular oxygen, and provided the corresponding α-hydroxy carbonyl compounds in high yield. The insoluble organic-inorganic hybrid polymer was readily recovered by centrifugation after the completion of reaction, and the recovered catalyst could be reused. Copyright