Seung Uk Son

Immobilized heterobimetallic Ru/Co nanoparticle-catalyzed Pauson–Khand-type reactions in the presence of pyridylmethyl formate

Heterobimetallic Ru/Co nanoparticles, immobilized on charcoal, were synthesized and used as catalysts in the Pauson-Khand-type reaction in the presence of pyridylmethyl formate instead of carbon monoxide; the catalysts were effective for intra- and intermolecular reactions and easily reused without loss of catalytic activity.

Synthesis of novel planar chiral ferrocene and cyclopentadienyl manganese tricarbonyl derivatives and their use as chiral ligands in the palladium-catalyzed asymmetric allylic alkylation

We have shown that cymantrene derivatives are better P,N-chelate ligands for palladium-catalyzed allylic alkylation than ferrocenes, which have a similar pentagonal ligand structure to cymantrene derivatives. In particular, the PPh 3 -substituted cymantrene gave a higher enantioselectivity (>98%).

Pauson-Khand reactions catalyzed by entrapped rhodium complexes

Abstract An entrapped Rh complex prepared by a sol–gel process has been used as a catalyst in the Pauson–Khand reaction under mild reaction conditions; the catalyst is easily recovered and reused at least 10 times without losing catalyst activity.

Co/C-catalyzed tandem carbocyclization reaction of 1,6-diynes

Cobalt on charcoal (Co/C) can be used as a catalyst in the tandem carbocycloaddition reaction of 1,6-diyne and carbon monoxide. The reaction product is dependent upon the reaction temperature, the position of the functional group, and the substrate itself.

Colloidal cobalt nanoparticles: a highly active and reusable Pauson–Khand catalyst

A new Pauson-Khand catalyst based on colloidal cobalt nanoparticles has been developed; the catalyst is highly effective for many intra- and inter-molecular Pauson-Khand reactions and can be recycled and reused many times without losing catalytic activity.

Synthesis of monodisperse chromium nanoparticles from the thermolysis of a Fischer carbene complex

We successfully synthesized monodisperse chromium nanoparticles from the thermolysis of a Fischer carbene complex.

Unusual flexibility of 2,5-bis(4-pyridylethynyl)thiophene self-assembled with Co(NCS)2 in a novel coordination polymer

A novel coordination polymer containing Co(NCS)2 and a rigid ligand, 2,5-bis(4-pyridylethynyl)-thiophene showing unusual flexibility was synthesized.

Synthesis of planar chiral tricarbonylcyclopentadienylmanganese complexes using a Mn(CO)3+ transfer reaction

Planar chiral ligand transfer reactions can be carried out by nthe reaction of [(naphthalene)Mn(CO)3]BF4 with planar nchiral ferrocene derivatives.

Synthesis of planar chiral (1,3-disubstituted arene)Mn(CO)3+ cations via addition of nucleophiles to (oxocyclohexadienyl)Mn(CO)3 in the presence of chiral ligands

The first example of the synthesis of planar chiral (1,3-disubstituted arene)Mn(CO)3+ cations (3) has been demonstrated by a reaction of (p-cresol)Mn(CO)3+ with KOBut followed by addition of nucleophiles and subsequent quenching with electrophiles in the presence of (S)-binaphthol in CH2Cl2.