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  • 1
    Electronic Resource
    Electronic Resource
    [Fe(thf)6][Cl3Fe–O–FeCl3] (2001)
    Copenhagen : International Union of Crystallography (IUCr)
    Acta crystallographica 57 (2001), S. m216-m217 
    Details
    ISSN: 1600-5368
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: The title compound, hexakis(tetrahydrofuran)iron(II) μ-oxo-bis[trichloroferrate(III)], [Fe(C4H8O)6][Fe2Cl6O], was obtained by oxidation of FeCl2 in tetrahydrofuran. The O atom of the anion and the Fe atom of the cation are located on special positions of site symmetry \overline 3; the Fe atoms of the anion are located on a threefold rotation axis and, as a result, there is just 1 \over 6 of both ions in the asymmetric unit.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S1600536801007115
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  • 2
    Electronic Resource
    Electronic Resource
    The biosynthesis pathway of di-myo-inositol-1,1′-phosphate in Pyrococcus woesei (1998)
    Oxford, UK : Blackwell Publishing Ltd
    FEMS microbiology letters 168 (1998), S. 0 
    Details
    ISSN: 1574-6968
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: From in vitro experiments with dialyzed cell-free extracts of the hyperthermophilic Archaeum Pyrococcus woesei, the biosynthetic pathway of di-myo-inositol-1,1′-phosphate was deduced. Starting from glucose 6-phosphate, the synthesis proceeds in two steps with l-myo-inositol 1-phosphate as intermediate. (1) Interconversion of glucose 6-phosphate to inositol 1-phosphate was observed without adding cofactors, such as nucleoside triphosphates or pyridine dinucleotides suggesting that the first enzyme reaction corresponds to the NAD+-dependent inositol 1-phosphate synthase reaction as already described for eukaryal systems, but differing from the latter by a stronger pyridine dinucleotide binding rendering the enzyme virtually independent from external NAD+. (2) In a second step, two l-myo-inositol 1-phosphates are coupled under the expense of NTP to yield di-myo-inositol-1,1′-phosphate. The coupling of two l-myo-inositol 1-phosphates without preceding dephosphorylation of one of both by a phosphorylase as proposed for the di-myo-inositol-1,1′-phosphate synthesis in Methanococcus igneus (Chen, L. and Roberts, M. (1998) Appl. Environ. Microbiol. 64, 2609–2615) is supported by labeling experiments which resulted only in a labeled product with l-myo [U-14C]inositol 1-phosphate, but not with radiolabeled l-myo-[U-14C]inositol and non-labeled l-myo-inositol 1-phosphate.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1574-6968.1998.tb13252.x
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  • 3
    Electronic Resource
    Electronic Resource
    Synthesis of Controlled Spherical Zinc Sulfide Particles by Precipitation from Homogeneous Solutions (1998)
    Westerville, Ohio : American Ceramics Society
    Journal of the American Ceramic Society 81 (1998), S. 0 
    Details
    ISSN: 1551-2916
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Zinc sulfide (ZnS) powders have been obtained by precipitation from homogeneous solutions of various zinc salt compounds, with S2- as precipitating anion, formed by decomposition of thioacetamide. Spherical particles with a very narrow size distribution can be obtained by controlling the synthesis parameters. The particle sizes are influenced by the nature of the associated anion. For example, nanometer-sized ZnS particles are formed using acetate or acetylacetonate anions under acidic pH conditions, controlled by the addition of acetic acid. Although the nucleation is accelerated by the use of acetic acid, limited particle growth occurs because of the formation of complexes with zinc cations that lowers the concentration of free cations in the solution. Also, the complexing-attachment phenomena of the ZnS particles with acetate and acetylacetonate anions lead to the arrest of particle growth processes. The presence of complexed Zn2+ species in the acidic solution is demonstrated both theoretically, using a model based on the calculations of the solubility isotherms of the soluble species, and by Fourier-transform infrared techniques. The nanostructured ZnS particles may provide a suitable semiconductor nanocluster material for optoelectronic applications as well as a phosphor suitable for application in flat-panel display technology.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1151-2916.1998.tb02679.x
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  • 4
    Electronic Resource
    Electronic Resource
    Terpene und Terpen-Derivate, XIX. Zur selektiven Epoxidierung von rac-β-Curcumen Darstellung von 1-(4-Methyl-1,4-cyclohexadien-1-yl)ethanon (1986)
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1986 (1986), S. 1248-1254 
    Details
    ISSN: 0170-2041
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Terpenes and Terpene Derivatives, XIX. - On the Selective Epoxidation of rac-β-Curcumene. Synthesis of 1-(4-Methyl-1,4-cyclohexadien-1-yl)ethanoneExpoxidation of rac-β-curcumene (1) yields a mixture containing the monoepoxides 2 - 4, and 6 in a ratio of 4:1:5:1 besides some other products. - Birch reduction of 17 gives only the hydrocarbon 18, even via the alkoxide. - The uncatalyzed Diels-Alder reaction of isoprene (10) with 3-butyn-2-one (11) leads to a mixture of the ketones 12 - 15 with a large amount of the 1,5-isomer 13 and the acetophenones 14 and 15. By TiCl4 catalysis the regioselectivity 12/13 can be enhanced to 94:6.
    Notes: Epoxidierung von rac-β-Curcumen (1) ergibt ein Gemisch, das neben anderen Produkten die Monoepoxide 2 - 4 und 6 im Verhältnis 4:1:5:1 enthält. - Die nichtkatalysierte Diels-Alder-Reaktion von Isopren (10) mit 3-Butin-2-on (11) führt zu einem Gemisch der Ketone 12 - 15 mit einem hohen Anteil des 1,5-Isomeren 13 sowie der Acetophenone 14 und 15. Durch TiCl4-Katalyse kann die Regioselektivität 12/13 auf 94:6 verbessert werden.
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jlac.198619860710
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  • 5
    Electronic Resource
    Electronic Resource
    Terpene und Terpen-Derivate, XXI. Synthese von rac-4,5-Dihydro-β-curcumen-4,5-diol (1987)
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1987 (1987), S. 1013-1014 
    Details
    ISSN: 0170-2041
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Terpenes and Terpene Derivatives, XXI. - Synthesis of rac-4,5-Dihydro-β-curcumene-4,5-diolHydrolysis of the β-curcumene monoepoxide 1 afforded the title compound 2. - A second way started from the epoxy ketone 6. Hydrolysis (→ 7), formation of the THP ethers (→ 8, → 9), and reaction with homoprenyllithium leads to the allylic alcohol 3. After further protection (→ 4), Birch reduction, and subsequent hydrolysis a 1:4 mixture of the diols 2 and (E/Z)-11 was isolated.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jlac.198719870864
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  • 6
    Electronic Resource
    Electronic Resource
    Friedel-Crafts-Reaktion von 2-Methylfuran mit gesättigten und α,β-ungesättigten Säureanhydriden (1985)
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1985 (1985), S. 1935-1950 
    Details
    ISSN: 0170-2041
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Friedel-Crafts Reaction of 2-Methylfuran with Saturated and α,β-Unsaturated Acid Anhydrides2-Methylfuran (5) reacts with the saturated acid anhydrides 16 - 26 in the presence of SnCl4 to give the 2-acyl-5-methylfurans 37 - 47 selectively. The unsaturated anhydrides 27 - 32, however, yield mixtures which only in the case of senecioic acid anhydride (29) contain the respective primary product 48. Subsequent reactions lead to the addition products 55 (from 27) and 56 (from 29), and to (E,Z)-mixtures of their enol estes 57 - 62 which could partially be separated and assigned.  -  The olfactory properties of 2, 37 - 48, 50, 52, and 53 were investigated.
    Notes: 2-Methylfuran (5) reagiert mit den gesättigten Säuranhydriden 16 - 26 in Gegenwart von SnCl4, einheitlich zu den 2-Acyl-5-methylfuranen 37 - 47. Die ungesättigten Anhydride 27 - 32 ergeben dagegen Gemische, die nur im Falle von Seneciosäureanhydrid (29) auch das betreffende Primärprodukt 48 enthalten. Folgereaktionen führen zu den Additionsprodukten 55 (aus 27) und 56 (aus 29) sowie deren (E,Z)-Enol-Ester-Gemischen 57 - 62, die teilweise getrennt und zugeordnet werden konnten.  -  Die olfaktorischen Eigenschaften von 2, 37 - 48, 50, 52 und 53 wurden untersucht.
    Additional Material: 5 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jlac.198519851003
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  • 7
    Electronic Resource
    Electronic Resource
    Synthese von 14,17-überbrückten 11β-Arylsteroiden (1989)
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1989 (1989), S. 151-158 
    Details
    ISSN: 0170-2041
    Keywords: Antiprogestational activity ; Steroids, 11β-aryl-substituted ; Steroids, 14,17-ethano-bridged ; [4 + 2] Cycloaddition of steroidal 14,16-dienes ; Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Synthesis of 14,17-Bridged 11β-ArylsteroidsThe search for new progesterone antagonists led to the synthesis of 14,17-bridged 11β-arylsteroids. The key step was a stereo- and regioselective [4 + 2] cycloaddition of electron-deficient olefins to steroidal 14,16-dienes. The resulting new structures were examined with respect to progesterone receptor binding and to anti-progestational activity.
    Notes: Auf der Suche nach neuen Progesteron-Antagonisten wurden 14,17-überbrückte 11β-Arylsteroide synthetisiert. Schlüsselschritt des Verfahrens war die stereo- und regioselektive [4 + 2]-Cycloaddition elektronenarmer Olefine an steroidale 14,16-Diene. Die auf diese Weise zugänglichen neuen Strukturen wurden auf Progesteronrezeptor-Affinität und antigestagene Wirkung geprüft.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jlac.198919890130
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  • 8
    Electronic Resource
    Electronic Resource
    Terpene und Terpen-Derivate, XVIII. Zur Darstellung von rac-γ-Curcumen (1986)
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1986 (1986), S. 1021-1029 
    Details
    ISSN: 0170-2041
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Terpenes and Terpene Derivatives, XVIII. - Concerning the Preparation of rac-γ-CurcumenePreparation of pure γ-curcumene (3) described by Birch in 1949 via dehydratization of the alcohol 5 with SOCl2/pyridine or Burgess reagent. Analogously the secondary alcohol 20 yielded mixtures of 3 and the 1,3-dienes 21 and (presumably) 22. - Li/NH3 reduction of the tert. benzyl alcohol 8 afforded after work-up directly the dienone 15 which with MeLi gave the dehydro derivative 16 of zingiberenol (17).
    Notes: Die von Birch 1949 beschriebene Darstellung reinen γ-Curcumens (3) durch Dehydratisierung des Alkohols 5 mit SOCl2/Pyridin konnte nicht reproduziert werden. Auch mit POCl3/Pyridin oder dem Burgess-Reagenz wurden aus 5 immer Gemische aus α-, β- und γ-Curcumen (1 - 3) erhalten. Analog lieferte auch der sekundäre Alkohol 20 Gemische aus 3 und den 1,3-Dienen 21 und (vermutlich) 22. - Die Li/NH3-Reduktion des tert. Benzylalkohols 8 führte nach Aufarbeitung direkt zum Dienon 15, das mit MeLi das Dehydroderivat 16 des Zingiberenols (17) ergab.
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jlac.198619860607
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  • 9
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    SI traceable calibration of an instrumented indentation sensor spring constant using electrostatic force (2008)
    American Institute of Physics
    Details
    Publication Date: 2008-01-01
    Print ISSN: 0034-6748
    Electronic ISSN: 1089-7623
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Published by American Institute of Physics
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  • 10
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    The Sodium Cuprate (tBu3Si)2CuNa:  Formation and X-ray Crystal Structure Analysis (2001)
    American Chemical Society
    Details
    Publication Date: 2001-02-01
    Print ISSN: 0276-7333
    Electronic ISSN: 1520-6041
    Topics: Chemistry and Pharmacology
    Published by American Chemical Society
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