Aoi Ono

Hydrogenation of Diaryl and Arylalkyl Ketones by Sodium Borohydride and Aluminum Chloride

Abstract Diaryl and arylalkyl ketones such as acetophe-none, p-methylacetophenone, propiophenone, and benzophe-none as well as diaryl and arylalkyl secondary alcohols such as 1-phenylethanol and benzhydrol were effectively hydrogenated to hydrocarbons (methylene) by NaBH4, in combination with A1C13.

Hydro-Dehalogenation of α-Haloketones by Tin (II) Chloride and Sodium Hydrogen Sulfide

Abstract Aromatic and aliphatic α-haloketones were effectively dehalogenated by binary systems of sodium hydrogen sulfide (soft base) and a metal chloride such as tin (II) chloride, iron (II) chloride or chromium (III) chloride (hard acid).

Gas-chromatographic analysis of free dichlorophenol isomers on modified Bentone 34

ZusammenfassungDie schwierige gas-chromatographische Trennung von Dichlorphenol-Isomeren als freie Phenole wurde untersucht. Es ergab sich, daß mit einer Mischphase von Benton 34 und Dioctylphthalat sowie von Benton 34 und Sorbit alle Isomere ausreichend gut getrennt werden können. Eine Mischphase aus Benton 34 und Mannit erlaubte die vollständigste Trennung.SummaryAlthough it is difficult to analyze dichlorophenol isomers as free phenols by gas liquid chromatography, it has been found that a mixed phase consisting of Bentone 34 and dioctyl phthalate and one of Bentone 34 and sorbitol, resolved all dichlorophenol isomers sufficiently well. A mixed phase consisting of Bentone 34 and mannitol provided the most complete separation of the isomers.

Studies on the separation of alkylbenzenes by gas—liquid chromatography VII. A linear free-energy relationship in the gas—liquid chromatographic separation of alkylbenzenes

In the separation of alkylbenzenes by gas—liquid chromatography, a good linear relationship was shown between the logarithm of the relative retention time and the substituent constant (σ) of the alkylbenzenes. The application of Yukawa and Tsunos equation showed that the additional resonance factor (r) has a negative value. It may be consistent with these phenomena to conclude that the dipolar interaction between the alkyl group of alkylbenzenes and the liquid phase will play an important role in the gas chromatographic separation. A linear relationship was also shown in the separation of o-dialkylbenzenes.

Gas chromatographic separation of xylenol isomers on new stationary liquid phases including xanthine derivatives

ZusammenfassungEine gute Trennung von Xylenol-Isomeren wurde an Coffein, Theophyllin, Histidin, Hydantoin, Isatin, Adenosin, Inosin sowie Guanosin erzielt. Die besten Ergebnisse mit fast symmetrischen Peaks wurden an Coffein und Theophyllin erhalten. Obwohl gute Trennungen an Coffein, Theophyllin, Adenosin und Inosin unterhalb von deren Schmelzpunkten erreicht wurden (möglicherweise durch Adsorption), wurde doch gefunden, daß auch Verteilungsvorgänge dabei eine gewisse Rolle spielen.SummaryXylenol isomers were effectively separated on caffeine, theophylline, histidine, hydantoin, isatin and also adenosine, inosine and guanosine. Caffeine and theophylline showed the most excellent resolutions and provided nearly symmetrical peaks. Although the effective separations on caffeine, theophylline, adenosine and inosine were obtained below their melting points (possibly by adsorption), it was found that partition played a certain role in these cases.

Separation behaviour of nitroxylene isomers on polyols and polyethers in gas-liquid chromatography.

Of the six nitroxylene isomers, 2,4- and 2,3-nitroxylene are the most difficult to separate by GLC, but they have been effectively separated on various acidic polyols as stationary phases. Although polyethylene glycol could not generally separate the 2,4- and 2,3-nitroxylene isomers, polyethylene glycol 20M could, and polypropylene glycol could separate all the six isomers effectively.

Gas Chromatographic Analyses of Nitroxylene Isomers on Various New Liquid Phases

Abstract Luminol, violuric acid, thymine, alloxane, orotic acid, imidazole, phthalimide and nicotinic acid effectively resolved all the nitroxylene (dimethylnitrobenzene) isomers and they are nitrogen containing heteroaromatic compounds. Ninhydrin (indantrione) also separated all the isomers and it is the only triketo-hydrocarbon among these effective liquid phases. Furthermore, almost all of these compounds resolved the isomers at a temperature below the melting points of the stationary phases.

Separation of mononitroacetamidotoluene and mononitromethylphenol isomers by thin-layer and gas—liquid chromatography

Abstract The separations of mononitroacetamidotoluene and mononitromethylphenol isomers have been studied by thin-layer (TLC) and gas—liquid chromatography (GLC). The nine mononitroacetamidotoluene isomers are separated on silicone FL-100 by GLC, and on a silica gel plate with chloroform—ethyl acetate(9:1) by TLC. The seven mononitromethylphenol isomers are separated on ethylene glycol phthalate by GLC, and on an alumina plate with cyclohexane—acetone (8:2) by TLC. Ortho steric effects have been found in these separations.