- Vapor pressure and liquid heat capacity of perhydroacenaphthylene and perhydrophenanthrene
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Saturated vapor pressures and liquid heat capacities have been measured for liquid perhydroacenaphthylene and perhydrophenanthrene by comparative ebulliometry over an approximate pressure range from (8 to 100) kPa and by heat conduction calorimetry over a temperature range from about (305 to 335) K. The obtained results for vapor pressures and for heat capacities have been represented within experimental uncertainties by the Antoine and the Cox equations and by an empirical polynomial equation, respectively, and compared with the data available in the literature.
- Rohac, Vladislav,Censky, Miroslav,Zala, Diana,Ruzicka, Vlastimil,Ruzicka, Kvetoslav,Sporka, Karel,Aim, Karel
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- Acenaphthene and fluorene hydrogenation on industrial aluminum oxide catalysts in a flow system
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Hydrogenation of the tricyclic aromatic hydrocarbons acenaphthene and fluorene on industrial aluminum oxide catalysts in a flow system has been studied. It has been found that total these hydrocarbons are exhaustively hydrogenated in the presence of a nickel-chromium catalyst at 200°C and a pressure of 100 atm to give isomer mixtures of the corresponding perhydroaromatic hydrocarbons decahydroacenaphthene and dodecahydrofluorene. The liquid products obtained can be of interest as components of hydrocarbon fuels with increased density. Certain conformational features of the stereoisomers obtained have been considered. It has been assumed that some spatial isomers of decahydroacenaphthene have six-membered rings in the boat conformation.
- Bagrii,Tsodikov
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- Preparation method of perhydroacenaphthene
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The invention relates to the field of chemistry, and relates to a preparation method of perhydroacenaphthene; the preparation method comprises the steps: 1) adding industrial acenaphthylene to 95% ethanol, heating, refluxing and dissolving, then cooling, crystallizing, centrifuging to obtain refined acenaphthene, and carrying out distillation recycling of the filtrate; 2) adding the refined acenaphthene and a catalyst Raney Ni into a high-pressure kettle, replacing gas in the kettle with hydrogen, filling hydrogen to make the pressure in the kettle rise to 0.8 MPa, heating up to about 180 DEG C, starting a reaction for 5 h, continuously supplementing hydrogen during the reaction, making the pressure in the kettle rise slowly, and allowing the pressure after the reaction to be 4.0 MPa; and 3) cooling after the reaction is finished, filtering the catalyst, and thus obtaining the perhydroacenaphthene. The method is simple to operate, clean, environmentally friendly, and high in yield, and has less equipment investment.
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Paragraph 0010
(2017/02/09)
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- A PROCESS FOR PREPARING MEMANTINE
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The present invention relates to a process for preparing memantine, or a pharmaceutically acceptable salt thereof (e.g., memantine hydrochloride), which is substantially free of impurities.
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Page/Page column 20
(2010/08/08)
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- Hydrocracking of Acenaphthene over a Sulfided Ni-Mo/Al2O3 Catalyst
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The selectivity of ring opening was investigated for the hydrocracking of acenaphthene under an initial hydrogen pressure of 6 MPa and in the temperature range from 390 to 450 deg C.Major products were classified into the following six components: tetrahydroacenaphthylene, hexahydroacenaphthylene, perhydroacenaphthylene, ring opening products (bicyclic compounds and monocyclic compounds), alkylation products (tricyclic compounds of C13 or larger), and dimerization products (biacenaphthene and their hydrogenated compounds).Ring opening of acenaphthene proceeded via two routes: the direct ring opening of acenaphthene and ring opening after hydrogenation to hexahydroacenaphthylene.In the former reaction only 1-ethylnaphthalene was produced, while 1,8-dimethylnaphthalene and its hydrogenated products were not observed.In the latter reaction, on the other hand, two types of ring opening of a C-C bond adjacent to the benzene ring, the opening of a saturated five-membered ring to produce 1-ethyltetralin and the opening of a saturated six-membered ring to produce 1-propylindane, were observed.
- Miki, Yasuo,Sugimoto, Yoshikazu
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p. 723 - 729
(2007/10/02)
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- Synthesis of Stereoisomeric Ufolanes
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Three of the six possible stereoisomers of dodecahydroacenaphthylene, t,t,t-ufolane (1), c,c,t-ufolane (3), and c,c,c-ufolane (5), have been synthesized for the first time.The configurations have been confirmed inter alia by an X-ray analysis of the precursors 11, 14, and 23 and the bromine adduct 24 of c,c,c-10-ufolene (19), the precursor of 5. Key Words: Acenaphthylene, dodecahydro- / Acenaphthenes / Ufolanes
- Boldt, Peter,Arensmann, Eckart,Blenkle, Martin,Kersten, Helmut,Tendler, Heike,et al.
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p. 1147 - 1158
(2007/10/02)
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- Selective preparation of trans-perhydroacenaphthene
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Trans-isomers of perhydroacenaphthene are selectively prepared through hydrogenation of acenaphthene by effecting hydrogenation at 200° to 300° C. in the presence of a nickel catalyst on a kieselguhr carrier.
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- Selective preparation of cis-perhydroacenaphthene
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A cis-isomer of perhydroacenaphthene is selectively prepared through hydrogenation of acenaphthene by effecting hydrogenation of 80° to 200° C. in the presence of a Ru and/or Rh based catalyst. A cis-isomer having the highest boiling point is obtained as a major product.
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