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  • 1
    Electronic Resource
    Electronic Resource
    Structure and stereochemistry of brianolide, a new antiinflammatory diterpenoid from the Okinawan gorgonianBriareum sp. (1991)
    Springer
    Cellular and molecular life sciences 47 (1991), S. 501-502 
    Details
    ISSN: 1420-9071
    Keywords: Gorgonian ; brianolide ; diterpene ; Briareum sp. ; antiinflammatory activity
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Brianolide (1), a new antiinflammatory diterpenoid of the briarein class, possessing a β substituent at C-12 (R), has been isolated from the Okinawan gorgonianBriareum sp. Its structure has been established from spectral data in conjunction with a single crystal X-ray analysis.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01959955
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  • 2
    Electronic Resource
    Electronic Resource
    Low-lying states in112In (1980)
    Springer
    The European physical journal 295 (1980), S. 251-258 
    Details
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Low-lying states below 500 keV excitation in112In have been investigated via the112Cd(p, nγ) reaction. New levels have been established atE x=206.5keV and 456.1 keV from the measuredγ-ray excitation functions,γ−γ coincidences and the precision measurements of the (p, n) threshold energy of the ground state and of the 206.5 keV state of112In. Spins and parities of the 206.5 keV state (2+) and the 456.1 keV state (3+) and multipolarities and mixing ratios of the deexcitationγ-rays have been determined from the angular distributions and linear polarizations of the deexcitation γ-rays as well as the excitation functions of the residual levels. Possible configurations of the newly-found levels are discussed. Half-lives of two states have been remeasured:T 1/2=15.2±0.1 min for the ground state andT 1/2=20.9±0.1 min for the 156.4 keV (4+) state. The ground stateQ-value for the112Cd(p, n)112 In reaction has been measured to be −3.376±0.006 MeV.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01412205
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  • 3
    Electronic Resource
    Electronic Resource
    Proton strength functions in the mass region of 30 to 70 (1983)
    Springer
    The European physical journal 313 (1983), S. 293-296 
    Details
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Theoretical values ofs- andp-wave proton strength functions were calculated for the target mass region between 30 to 70 and were compared with experimental results. A reasonable agreement was obtained for thes-wave proton strength function.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01439481
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  • 4
    Electronic Resource
    Electronic Resource
    Ca-antagonistic substance from soft coral of the genusSarcophyton (1983)
    Springer
    Cellular and molecular life sciences 39 (1983), S. 67-69 
    Details
    ISSN: 1420-9071
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary A 14-membered ring diterpenoid named cembrane, possessing Ca-antagonistic action on the isolated rabbit aorta, has been isolated from a soft coral of the genusSarcophyton, and its structure established by X-ray and spectroscopic data.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01960632
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  • 5
    Electronic Resource
    Electronic Resource
    The promoter function of molybdenum in Rh/Mo/SiO2 catalysts for CO hydrogenation (1994)
    Springer
    Catalysis letters 28 (1994), S. 329-336 
    Details
    ISSN: 1572-879X
    Keywords: rhodium ; molybdenum ; oxygenates ; hydrogenation ; CO adsorption
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract A series of Rh/Mo/SiO2 catalysts with fixed Rh and different Mo contents were studied by FT-IR, chemisorption and CO hydrogenation. The FT-IR results at room temperature under CO atmosphere indicate that the addition of Mo to Rh/SiO2 suppresses the linear and bridged CO species and promotes the twin CO species, which is consistent with the chemisorption results. It is suggested that the Mo promoter works via stabilization of Rh1– ions and the coverage of Rh sites. The molybdenum promotes the formation of oxygenates and shifts the selectivity from hydrocarbons to oxygenates.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00806063
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  • 6
    Electronic Resource
    Electronic Resource
    Effects of SiO2/Al2O3 ratio of H-mordenite on encapsulated products inside the pores in shape-selective isopropylation of biphenyl (1998)
    Springer
    Catalysis letters 50 (1998), S. 149-152 
    Details
    ISSN: 1572-879X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The effects of SiO2/Al2O3 ratio of H-mordenite on the selectivity of encapsulated products in the pores and of bulk products were investigated in the isopropylation of biphenyl. The selectivity of 4,40 -diisopropylbiphenyl (4,40 -DIPB) of bulk products was varied with SiO2/Al2O3 ratio. Highly dealuminated H-mordenite gave a selectivity higher than 80%, whereas the selectivity was low for H-mordenite with SiO2/Al2O3 ratio of 10-20. On the other hand, the selectivity of 4,40 -DIPB in encapsulated DIPB isomers was higher than 85% for all H-mordenites regardless of SiO2/Al2O3 ratio. These results show that all H-mordenites catalyze the isopropylation of biphenyl with high shape-selectivity inside the pore. The low selectivity of 4,40 -DIPB in bulk products for H-mordenites with low SiO2/Al2O3 ratio was not due to a lack of shape-selectivity of the H-mordenites, but to non-regioselective isopropylation at the external acid sites. Non-regioselective catalysis over H-mordenite with low SiO2/Al2O3 ratio could be induced by choking pores by coke deposition.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1019075204342
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  • 7
    Electronic Resource
    Electronic Resource
    Effects of reaction temperature on the isopropylation of biphenyl over H-mordenite (1999)
    Springer
    Catalysis letters 57 (1999), S. 217-220 
    Details
    ISSN: 1572-879X
    Keywords: H-mordenite ; isopropylation ; biphenyl ; 4,4'-DIPB ; isomerization ; encapsulated products
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The effects of reaction temperature on the selectivity for bulk products and for encapsulated products in the pores were investigated in the isopropylation of biphenyl over a highly dealuminated H-mordenite under 0.8 MPa of propylene. The selectivity for 4,4'-diisopropylbiphenyl (4,4'-DIPB) in bulk products was changed with the increase of reaction temperature: it decreased with increasing that for thermodynamically stable 3,3'- and 3,4'-DIPB. However, the selectivity for 4,4'-DIPB in encapsulated products was as high as 85–90% between 200 and 350ºC. These results show that H-mordenite catalyzes the isopropylation of biphenyl inside the pore with high shape selectivity at these temperatures, and that the decrease of the selectivity for 4,4'-DIPB in the bulk products is due to its isomerization to 3,3'- and 3,4'-DIPB on external acid sites.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1019076405927
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  • 8
    Electronic Resource
    Electronic Resource
    Shape-selective isopropylation of biphenyl over a highly dealuminated mordenite: effect of propylene pressure (1993)
    Springer
    Catalysis letters 21 (1993), S. 71-75 
    Details
    ISSN: 1572-879X
    Keywords: Biphenyl ; 4,4′-diisopropylbiphenyl ; highly dealuminated H-mordenite ; shape-selective isopropylation ; isomerization
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract A highly dealuminated H-mordenite (H-M) catalyzed the selective isopropylation of biphenyl to 4,4′-diisopropylbiphenyl (4,4′-DIPB). The high selectivity is ascribed to the shape-selective catalysis in mordenite pores. The selectivity of 4,4′-DIPB decreased during the isopropylation of biphenyl due to isomerization of 4,4′-DIPB under low propylene pressure. The increase of propylene pressure suppressed the isomerization in the isopropylation. 4,4′-DIPB itself was isomerized over highly dealuminated H-M under low propylene pressure.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00767372
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  • 9
    Electronic Resource
    Electronic Resource
    Shape-selective alkylation of biphenyl over mordenites: effects of dealumination on shape-selectivity and coke deposition (1994)
    Springer
    Catalysis letters 26 (1994), S. 181-187 
    Details
    ISSN: 1572-879X
    Keywords: shape-selective catalysis ; biphenyl ; isopropylation ; H-mordenite ; carbonaceous deposits ; encapsulated biphenyls
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract To understand the relationships between shape-selectivity and coke deposition in the alkylation of biphenyl over H-mordenite (HM), thermogravimetric analyses were examined for the catalyst after the reaction. The coke deposition during the catalysis was very severe over HM with low SiO/Al2O3 ratio, however, dealumination enhanced the decrease of coke deposition. Over highly dealuminated HM, volatile organic compounds, mainly biphenyl derivatives, were observed in addition to carbonaceous deposits. The deposits are produced from biphenyl derivatives on acid sites in the HM pore, and the ease of their formation is governed by acid site density and acid strength. The decrease of carbonaceous deposits and the increase of encapsulated biphenyl derivatives are related with the increase of both selectivity and yield of 4,4′-diisopropylbiphenyl (4,4′-DIPB). The increase of reaction temperature up to 250°C enhanced the catalysis over highly dealuminated HM, however, further increase of the temperature resulted in extensive decrease of the selectivity of 4,4′-DIPB. Coke deposition also increased with the temperature although its level was low. The composition of 4,4′-DIPB in encapsulated DIPB isomers remained as high as 80% in spite of a change of the distribution of bulk products.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00824043
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  • 10
    Electronic Resource
    Electronic Resource
    Shape-selective alkylation of biphenyl over mordenite: cerium exchanged sodium mordenite and unmodified H-mordenite with low SiO2/Al2O3 ratio (1994)
    Springer
    Catalysis letters 27 (1994), S. 315-322 
    Details
    ISSN: 1572-879X
    Keywords: Shape-selective catalysis ; biphenyl ; isopropylation ; cerium exchanged sodium mordenite ; H-mordenite ; propylene pressure
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Liquid phase isopropylation of biphenyl with propylene was studied over a cerium exchanged sodium mordenite (Ce/NaM25) and a H-mordenite (HM25) with the same SiO2/Al2O3 ratio of 25. Shape-selective catalysis occurred to give 4,4′-diisopropylbiphenyl (4,4′-DIPS) in high selectivity over Ce/NaM25 under any propylene pressures. HM25 gave 4,4′-DIPS shape-selectively under high propylene pressures. However, the reaction was severely deactivated at a conversion of ca. 60% under such a low pressure as 0.8 kg/cm2 because of coke formation in the pore. The yields of 4-isopropylbiphenyl (4-IPBP) and 4,4′-DIPB decreased with the increase of those of 3-IPBP and 3,4′-DIPB because of non-selective alkylation and isomerization at external acid sites that are alive in spite of severe deactivation. No significant isomerization of 4,4′-DIPB over Ce/NaM25 was observed even at low propylene pressure. In the case of HM25, the isomerization of 4,4′-DIPB to 3,4′-DIPB occurred significantly under low propylene pressures, while it decreased under high pressure. These differences are ascribed to the differences of nature of acid sites between Ce/NaM25 and HM25 zeolites.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00813918
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