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1Author    Walter Strohmeier, Erich HitzelRequires cookie*
 Title    Katalytische Aktivität von homogenem und heterogenisiertem RhCl(PPh3)3 für die Hydrierung von Substraten ohne Solvens Catalytic Activity of Homogeneous and Heterogenized RhCl(PPh3)3 for Hydrogenation of Substrates without Solvents  
  Reference    (Z. Naturforsch. 31b, 945—947 [1976]; eingegangen am 2. März 1976) 
  Published    1976 
  Keywords    Catalysis, Hydrogenation, Rhodium 
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 TEI-XML for    default:Reihe_B/31/ZNB-1976-31b-0945.pdf 
 Identifier    ZNB-1976-31b-0945 
 Volume    31 
2Author    Requires cookie*
 Title    Catalytic Hydrogenation of U nsaturated Compounds with H 2PtC l6-SnCl2 * 2 H ,0 in Acetic Acid  
 Abstract    W a l t e k S t r o h m e ie r und M a g d a le n a P f ö h l e r A hydrogenation catalyst, operating under mild conditions can be prepared by dissolving H 2PtC l6 and SnCl2 • 2 H 20 in acetic acid. After injection of an unsaturated compound under a H 2-atmosphere the active m oiety of the catalyst is generated. No active m oiety of catalyst is formed if the compound has a triple bond. But acetylenic derivatives are hydrogenated if the active m oiety of the catalyst is first produced by hydrogenation of cyclohexene. 
  Reference    (Z. Naturforsch. 30b, 466—467 [1975]; eingegangen am 27. Januar 1975) 
  Published    1975 
  Keywords    Catalysis, Hydrogenation, Unsaturated Compounds 
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 TEI-XML for    default:Reihe_B/30/ZNB-1975-30b-0466_n.pdf 
 Identifier    ZNB-1975-30b-0466_n 
 Volume    30 
3Author    Walter Strohmeier, Luise WeigeltRequires cookie*
 Title    Homogeneous Catalytic Hydrogenation of Unsaturated Compounds with H2PtCl6 + SnCl2 * 2 H20 in iso-Propanol  
 Abstract    A catalytical system for homogeneous hy-drogenation of unsaturated compounds, oper-ating under mild conditions can be prepared with H2PtCl6-SnCl2 • 2 H20 and the additives HBr and H20 in m>-propanol. Reaction rates up to 32 mMol • 1 _1 • min -1 were observed. After hydrogenation of one batch new sub-strate can be injected several times without noticeable desactivation of the system. Hy-drogenation rate of 2-tr-cis-hexene is only 0,5 times less than of 1-hexene. Mesityloxide is selectively hydrogenated regarding the double bond. 
  Reference    (Z. Naturforsch. 31b, 387—389 [1976]; eingegangen am 17. Oktober 1975) 
  Published    1976 
  Keywords    Catalysis, Hydrogenation, Unsaturated Compounds 
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 TEI-XML for    default:Reihe_B/31/ZNB-1976-31b-0387_n.pdf 
 Identifier    ZNB-1976-31b-0387_n 
 Volume    31 
4Author    Walter Strohmeier, Magdalena PföhlerRequires cookie*
 Title    Homogeneous and Heterogeneous Catalytic Hydrogenation of Unsaturated Compounds with H2PtCl6 + SnCl2 * 2 H20 in Acetic Acid  
 Abstract    The hydrogenation catalyst, prepared by dissolving H2PtCl6 + SnCl2 • 2 H20 in acetic acid operates as a homogeneous or heteroge-neous catalyst, depending on the ratio v = Sn/Pt. Styrene is hydrogenated by the homo-geneous and heterogeneous system but cyclo-hexene only by the heterogeneous system. 
  Reference    (Z. Naturforsch. 31b, 390—392 [1976]; eingegangen am 17. Oktober/24. November 1975) 
  Published    1976 
  Keywords    Catalysis, Hydrogenation, Unsaturated Compounds 
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 TEI-XML for    default:Reihe_B/31/ZNB-1976-31b-0390_n.pdf 
 Identifier    ZNB-1976-31b-0390_n 
 Volume    31 
5Author    Friedrich Bölsing, Assadollah HakimRequires cookie*
 Title    Präparative organische Chemie unter Verwendung einfach herzustellender Katalysatoren A Simple Method for Preparation of Catalysts for Preparative Organic Chemistry  
 Abstract    There are numerous simple chemical reactions in which reaction products arise, which compared with the materials at the outset, possess a considerably greater surface area. A significant example is the reaction of aluminium alcoholates with water. Reactions of this kind can, to a certain extent, be used as auxiliary reactions, in order to distribute other materials homogenously. In the chosen example, a material dissolved beforehand in the alcoholate, e.g. a solution of a metal salt, would be transferred in the course of the distributing reaction into the newly-developing structure of the reaction product. In this publication the application of some catalysts thus prepared to some classical organic chemical reactions is described by way of example. 
  Reference    Z. Naturforsch. 33b, 632—635 (1978); eingegangen am 9. Februar 1978 
  Published    1978 
  Keywords    Catalysts, Hydrogenation, Dehydrogenation, Dehydration 
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 TEI-XML for    default:Reihe_B/33/ZNB-1978-33b-0632.pdf 
 Identifier    ZNB-1978-33b-0632 
 Volume    33 
6Author    Erich HitzelRequires cookie*
 Title    Abbau von Induktionsperioden und Steigerung der Aktivität homogener Hydrierungskatalysatoren mit Iridium als Zentralatom Reduction of Induction Periods and Increase of Activity of Homogenous Iridium Hydrogenation Catalysts  
 Abstract    With complexes of iridium as catalysts, induction periods are typical for homogeneous hydrogenation of olefins in bulk. The induction period decreases, as a rule with increasing activity, at higher temperatures and may be suppressed with dibenzoylperoxide, azo-bisisobutyrodinitrile, tetrachloro-l,4-benzoquinone or by preactivation. Triethylamin and SnCl2 • 2H2O are unsuitable additives. The operation "preactivation" leads additionally to great substrate/catalyst-turnover numbers. 
  Reference    Z. Naturforsch. 33b, 997—1000 (1978); eingegangen am 19. Juni 1978 
  Published    1978 
  Keywords    Catalysis, Hydrogenation, Induction Periods, Activity 
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 TEI-XML for    default:Reihe_B/33/ZNB-1978-33b-0997.pdf 
 Identifier    ZNB-1978-33b-0997 
 Volume    33 
7Author    Walter Strohmeier, Johannes-Peter StaschRequires cookie*
 Title    Photoaktivierung und Photosensibilisierung des homogenen Hy drierungs -Katalysators IrCl(CO) [P(i-C3H7)3] 2 Photoactivation and Photosensitization of the Homogeneous Hydrogenation Catalyst IrCl(CO)[P(i-C3H7)3]2  
 Abstract    Under irradiation with monochromatic light of X < 407 nm homogeneous hydrogenation of acrylic ethvlester with the catalyst IrCl(CO)[P"(i-C3H7)3]2 is much faster than in the dark reaction. Not the catalyst but the hydrido-complex is photochemically activated. With the sensitizer pentacene, photoactivation occurrs with visible light of X < 578 nm already. 
  Reference    Z. Naturforsch. 34b, 755—758 (1979); eingegangen am 31. Januar 1979 
  Published    1979 
  Keywords    Photoactivation, Photosensitization, Hydrogenation, Catalysis 
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 TEI-XML for    default:Reihe_B/34/ZNB-1979-34b-0755_n.pdf 
 Identifier    ZNB-1979-34b-0755_n 
 Volume    34 
8Author    Wolfgang Bernhardt, Heinrich VahrenkampRequires cookie*
 Title    Hydrierungen und Dehydrierungen im System Benzonitril/Ru 3 (CO)i 2 /Benzylamin Hydrogenations and Dehydrogenations in the System Benzonitrile/Ru 3 (CO) 12 /Benzylamine  
 Abstract    The stepwise interconversions between benzonitrile and benzylamine have been realized in both directions via Ru3 cluster intermediates. The hydrogenation/dehydrogenation system can be entered from Ph-CN, Ru3(CO)12, and H2 yielding HRu3(CO),n(NCHPh) or from PhCH2NH2 and Ru3(CO)12 yielding HRu3(CO)10(NHCH2Ph). These two clusters can be interconverted by thermal hydrogenation and dehydrogenation, with H2Ru3(CO)9(NCH2Ph) as a CO and H2 depen-dent intermediate. The system can be left only towards benzylamine which is formed in small yields from HRu3(CO)10(NHCH2Ph) at high temperatures and under high CO or H2 pressures. 
  Reference    Z. Naturforsch. 43b, 643—647 (1988); eingegangen am 29. Januar 1988 
  Published    1988 
  Keywords    Hydrogenations, Dehydrogenations, Benzonitrile, Benzylamine 
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 TEI-XML for    default:Reihe_B/43/ZNB-1988-43b-0643.pdf 
 Identifier    ZNB-1988-43b-0643 
 Volume    43 
9Author    H.A B L, D.E ERequires cookie*
 Title    Facile Synthesis of the Chalcones and Dihydrochalcones from Naringin, Neohesperidin and Hesperidin  
 Abstract    The flavanone glycosides naringin, neohesperidin and hesperidin were converted chemically to the corresponding chalcones and dihydrochalcones; the one-step synthesis, performed at room temperature, required the presence of 25% K O H in the reaction mixture for the former and 10% K O H , a catalyst and molecular hydrogen at atmospheric pressure for the latter. 
  Reference    (Z. Naturforsch. 30b, 606—608 [1975]; received April 1 1975) 
  Published    1975 
  Keywords    Dihydrochalcones, Sweeteners, Flavanone Glycosides, U V Spectra, Hydrogenation 
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 TEI-XML for    default:Reihe_B/30/ZNB-1975-30b-0606.pdf 
 Identifier    ZNB-1975-30b-0606 
 Volume    30 
10Author    Walter Strohmeier, Magdalena PföhlerRequires cookie*
 Title    Vergleich der Hydrierung ungesättigter Verbindungen mit einem homogenen und heterogenen Platin-Katalysator in Essigsäure Comparison of Hydrogenation of Unsaturated Compounds with a Homogeneous and Heterogeneous Platinum Catalyst in Acetic Acid  
 Abstract    Catalytical hydrogenation of unsaturated compounds in acetic acid with the homo-geneous catalyst prepared from H2PtCl6 + SnCl2 • 2 H20 and the heterogeneous catalyst, prepared from H2PtCl6 and H2, were carried out. A comparison of the results reveals two types of substrates, some are readily hydrogenated by the homogeneous the other ones by the heterogeneous system. Turnover numbers up to 1500 were observed. With the heterogeneous catalyst ethylbenzene is hydrogenated to ethylcyclohexane under mild conditions. 
  Reference    (Z. Naturforsch. 31b, 941—944 [1976]; eingegangen am 2. März 1976) 
  Published    1976 
  Keywords    Catalysis, Hydrogenation, Homogeneous Catalyst, Heterogeneous Catalyst 
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 TEI-XML for    default:Reihe_B/31/ZNB-1976-31b-0941.pdf 
 Identifier    ZNB-1976-31b-0941 
 Volume    31 
11Author    Walter Strohmeier, Manfred Michel, Luise WeigeltRequires cookie*
 Title    mit homogenen Ir-und Ru-Katalysatoren Selective Bulk-Hydrogenation of a,ß Unsaturated Ketones to Ketones with Homogeneous Ir and Ru Catalysts  
 Abstract    a,ß Unsaturated ketones are selectively hydrogenated to ketones in homogeneous bulk-catalysis under mild conditions by iridium-and ruthenium complexes. The range of mean turnover is from 6 to 196 depending on substrate, catalyst and reaction conditions. Selectivity ketone/alcohol depends on the degree of conversion and exceeds 100 on con-version of 90%. Einleitende Bemerkungen 
  Reference    Z. Naturforsch. 35b, 648—650 (1980); eingegangen am 7. Dezember 1979 
  Published    1980 
  Keywords    Catalysis, Homogeneous, Selective, Hydrogenation, Unsaturated Ketones 
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 TEI-XML for    default:Reihe_B/35/ZNB-1980-35b-0648.pdf 
 Identifier    ZNB-1980-35b-0648 
 Volume    35 
12Author    Anders Ljungqvist, Karl FolkersRequires cookie*
 Title    Study of Hydrogenolytic Cleavage of Peptide-Resin Benzyl Ester Bonds for Synthesis of Protected Fragments of the Human Leukocyte Interferon  
 Abstract    Three Boc-protected fragments of the human leukocyte interferon, LeIFA, have been synthesized: I, BOC LeIFA (99-105) (BOC-Val-Ile-Gln-Gly-Val-Gly-Val); II, BOC LeIFA (116-119) (BOC-Ile-Leu-Ala-Val); III, BOC LeIFA (123-126) (BOC-Phe-Gln-Arg(Tos)-Ile). The presence of the Boc-group was desired so that these peptides could serve as intermediates in fragment condensation toward larger segments of interferon. To achieve these intermediates, a study was desirable on three methods of cleavage of the benzyl ester-polymer bonds. It was found that hydrogenolysis with hydrogen and palla-dium generated in situ was distinctly superior to transfer hydrogenation with ammonium formate or cyclohexene. An effective swelling of the peptide-resin to allow penetration of palladium acetate into the matrix and mobility of the peptide chains on the resin to expose the benzyl ester bond to hydrogenolysis appear to be essential conditions for the best cleavage. 
  Reference    Z. Naturforsch. 38b, 1022—1024 (1983); received May 2 1983 
  Published    1983 
  Keywords    Interferon, Peptide Synthesis, Hydrogenation, Palladium Black, Conformation 
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 TEI-XML for    default:Reihe_B/38/ZNB-1983-38b-1022.pdf 
 Identifier    ZNB-1983-38b-1022 
 Volume    38 
13Author    Francesco Ciardelli, Paolo PerticiRequires cookie*
 Title    Structure and Reactivity of Aromatic Polymers/Ruthenium Catalysts  
 Abstract    Previously prepared (J. Mol. Catalysis 11, 353 (1981)) polystyrene/ruthenium systems have been examined by EXAFS, TEM, IR and Raman spectroscopy. A structure based on small metal clusters bound to the polymer by single ruthenium-arene binding is proposed. The general validity of the approach has been confirmed by preparing a similar product when starting with poly-1-vinylnaphthalene in the place of polystyrene. Both systems are active for the hydrogenation of a large variety of unsaturated groups such as olefinic double bonds, mononuclear aromatic hydrocarbons, ketones, nitriles, nitroaromatic com-pounds and oximes. Catalytic activity, chemio-and stereoselectivity are discussed in terms of the proposed structure. 
  Reference    Z. Naturforsch. 40b, 133—140 (1985); received September 13 1984 
  Published    1985 
  Keywords    Hydrogenations, Heterogeneous Catalysts, Ruthenium/Aromatic Vinyl Polymer Systems, Ruthenium/Arene Systems 
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 TEI-XML for    default:Reihe_B/40/ZNB-1985-40b-0133.pdf 
 Identifier    ZNB-1985-40b-0133 
 Volume    40