H
Hitoshi Watarai
Researcher at Tohoku University
Publications - 14
Citations - 110
Hitoshi Watarai is an academic researcher from Tohoku University. The author has contributed to research in topics: Partition coefficient & Acetylacetone. The author has an hindex of 7, co-authored 14 publications receiving 105 citations.
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Journal ArticleDOI
Keto-enol tautomerization rates of acetylacetone in mixed aqueous media
Hitoshi Watarai,Nobuo Suzuki +1 more
TL;DR: In this paper, the kinetics of keto-enol tautomerization of acetylacetone were studied in mixed aqueous media by u.v. and NMR spectrometries.
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Keto-enol tautomerization rates of acetylacetone in water-acetonitrile and water-dimethyl sulfoxide mixtures: Rate-partition relationship
Hitoshi Watarai,Nobuo Suzuki +1 more
TL;DR: In this paper, the rate of the keto-enol tautomerization of acetylacetone was studied in water-acetonitrile (AN) and water-dimethyl sulfoxide (DMSO) mixtures.
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Liquid-liquid partition of tris(acetylacetonato) metal(III) complexes in heptanewater-dimethyl sulfoxide mixture systems
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Flow fluorimetry of trace amounts of uranium(VI) after preconcentration on a tri-n-octylphosphine oxide/polyethylene column and elution with hydrogenphosphate solution
Hitoshi Watarai,Nobuo Suzuki +1 more
TL;DR: In this article, a simple flow fluorimetric method was applied to the determination of uranium in a spinel, which provided a limit of detection of 0.04 μg for uranium and the calibration graph was linear for the range 0.08-0.8 μg of uranium when 4−15 ml of sample solution was passed through the column.
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Partition kinetic studies of n-alkyl substituted β-diketones
Hitoshi Watarai,Nobuo Suzuki +1 more
TL;DR: In this article, the effect of substituent effect on the partition mechanism of β-diketone was discussed and it was proved that the partition rate constant of the β-DIKetone is governed by the partition coefficients of keto and enol forms which increase in proportion to the total carbon numbers of the substituents and the tautomerization rate constant in aqueous phase which decrease with decreasing of the inductive substituaent constant (Taft's σ ∗ ) of n -alkyl group.