Browsing by Author "Iwasawa, Yasuhiro"

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    Catalytic Activities of Polynaphthoquinone, Containing various Metal Halides: Dehydrogenation of Formic Acid, Cyclohexene, Ammonia and Alcohols, and Isomerization of Butene
    (Journal of the Chemical Society : Faraday Transaction - I. The Chemical Society, London. 1972, 68 (9), 1972) Iwasawa, Yasuhiro; Soma, Mitsuyuki; Onishi, Takaharu; Tamaru, Kenzi
    The catalytic activities of polynaphthoquinone, containing various metal halides, such as FeCl3, VCl3, MoCl5 and TiCl4, were studied. The polynaphthoquinone was obtained by the oxidation of naphthalene-1,7-diol and successive heat-treatment. The dehydrogenation of formic acid and alcohols occurred in the temperature region 20 to 100°C over both polynaphthoquinone containing FeCl3 and metal free polynaphthoquinone. The selectivity of the dehydrogenation of isopropyl alcohol was characteristically related to the FeCl3 content of the catalyst. The dehydrogenation of cyclohexene at 200°C and the decomposition of ammonia at 300°C were also studied. The catalytic isomerization of cis-but-2-ene to trans-but-2-ene and to but-1-ene in the region 100 to 200°C was markedly affected by the nature and the quantity of the metal halides in the polynaphthoquinone.
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    Dehydrogenation and Dehydration of Ethyl Alcohol over a Polynaphthoquinone containing various amounts of FeCl3: Selectivity of Formation of Acetaldehyde, Ethylene and Diethyl Ether
    (Journal of the Chemical Society : Faraday Transaction - I. The Chemical Society, London. 1974, 70 (1-6), 1974) Iwasawa, Yasuhiro; Ogasawara, Sadao; Onishi, Takaharu; Tamaru, Kenzi
    The decomposition of ethyl alcohol over polynaphthoquinones with various amounts of FeClj in the temperature range from 150 to 230°C is reported. Adsorption of ethyl alcohol on poly naphthoquinones containing FcC13 is of a Langmuir type, ethyl alcohol being adsorbed selectively on the FeCIj. The mechanism and the selectivity of the formation of acetaldehyde, ethylene and diethyl ether are discussed in detail. The relative ratio of the formation of diethyl ether to ethylene in the dehydration is markedly affected by the FeCl3 content of the catalysts.
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    Reduction of Methylene Blue by Dihydro-compounds, Catalyzed by Aliphatic Amines, and the Reaction of Methylene Blue with Aliphatic Amines
    (Journal of the Chemical Society : Faraday Transaction - I. The Chemical Society, London. 1972, 68 (9), 1972) Iwasawa, Yasuhiro; SoxMa, Mitsuyuki; Onishi, Takaharu; Tamaru, Kenzi
    Methylene Blue may be regarded as a model compound of flavin co-enzymes, and its reactions in solution are interesting from a biochemical viewpoint. The reduction of Methylene Blue by dihydro-compounds, catalyzed by aliphatic amines, has been studied, and the reaction of Methylene Blue with the aliphatic amines was also investigated to give some information about the semiquinone radicals from Methylene Blue related to flavin co-enzymes. The reactions were carried out in the absence of air at 20 ± 1°C in 1,2-dichloroethane. It was consequently found that the reduction of Methylene Blue by dihydro-compounds was accelerated by the addition of aliphatic amines, and the semiquinone radical of Methylene Blue was formed as an intermediate in the reaction between Methylene Blue and the aliphatic amines.
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    Various Reactions Catalyzed by the Electron Donor-Acceptor Complex of Polynaphthoquinone with Potassium
    (Journal of the Chemical Society : Faraday Transaction - I. The Chemical Society, London. 1974, 70 (1-6), 1974) Iwasawa, Yasuhiro; Fujitsu, Hiroshi; Onishi, Takaharu; Tamaru, Kenzi
    The H2-D2 exchange reaction, the synthesis of ammonia, hydrogen exchange reaction of propene with deuterium and the isomerization of butene over the electron donor-acceptor (EDA) complexes of potassium with metal-free polynaphthoquinone and with polynaphthoquinones containing FeCl3 are discussed. H2-D2 exchange over the EDA complexes is catalyzed even at — 789C. The inter mediate in propene-deuterium exchange is the half-hydrogenated isopropyl species. The difference in the poisoning effect of oxygen for the formation of ammonia and to the H2-D2 exchange is also noted.