Jun-ichi Kuroda

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The characteristics shown in the electrospray ionization/ion trap mass spectra of ring-opened LI-F antibiotics (cyclic depsihexapeptides with a 15-guanidino-3-hydroxypentadecanoic group as a side-chain) were examined. Collision-induced dissociation (CID) MS of protonated molecules of the depsipeptides produced many fragment ions. Most of these fragment ions(More)
Coordination-insertion copolymerization of allyl monomers with ethylene was developed by using a palladium/phosphine-sulfonate catalyst. A variety of allyl monomers, including allyl acetate, allyl alcohol, protected allylamines, and allyl halides, were copolymerized with ethylene to form highly linear copolymers that possess in-chain -CH(2)CH(CH(2)FG)-(More)
A series of palladium/alkylphosphine-sulfonate catalysts were synthesized and examined in the homopolymerization of ethylene and the copolymerization of ethylene and polar monomers. Catalysts with alkylphosphine-sulfonate ligands containing sterically demanding alkyl substituents afforded (co)polymers whose molecular weight was increased by up to 2 orders(More)
Six new phenol (anthraquinone or stilbene) glycosides with an acyl group at 6-position of the glucopyranose moiety were isolated from rhubarb (the roots of Rheum palmatum) cultivated in Japan, together with 22 known compounds. Most of these compounds were evaluated for cytotoxic activity against tumor and normal cells and for induction of DNA damage by(More)
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