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  • 1
    Electronic Resource
    Electronic Resource
    Cassiadinine, a chromone alkaloid and (+)-6-hydroxy-mellein, a dihydroisocoumarin from Cassia siamea
    Amsterdam : Elsevier
    Phytochemistry 25 (1986), S. 1727-1730 
    Details
    ISSN: 0031-9422
    Keywords: (+)-6-hydroxymellein ; 5-acetonyl-7-hydroxy-2-methylchromone ; Cassia siamea, Leguminosae ; alkaloid ; betulin ; cassiadinine ; cycloart-23-ene-3β,25-diol ; dihydroisocoumarin ; friedelin ; γ-sitosterol.
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology , Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/S0031-9422(00)81245-5
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  • 2
    Electronic Resource
    Electronic Resource
    Diborane as a reducing agent - VI the novel reduction of indole-1-carboxaldehydes to 1-methyl- indoles, di(indolyimethyl) ethers and indolylmethyl indolines
    Amsterdam : Elsevier
    Tetrahedron 40 (1984), S. 4351-4357 
    Details
    ISSN: 0040-4020
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/S0040-4020(01)98809-X
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  • 3
    Electronic Resource
    Electronic Resource
    Diborane as a reducing agent IX: Reduction of aTris(trifluoroacetyl)enaminospiroindoline (1997)
    Springer
    Monatshefte für Chemie 128 (1997), S. 1283-1289 
    Details
    ISSN: 1434-4475
    Keywords: Tris(trifluoroacetyl)enaminospiroindoline ; Diborane ; 1-Trifluoroethyl-3-(2′-(trifluoroethylamino)ethyl)-3-vinylindoline ; Hydroxyspiroindolenine
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Reduktion der Titelverbindung (2) mit Diboran ergibt 1-Trifluoroethyl-3-(2′-(trifluoroethylamino)ethyl)-3-vinylindolin (4), 1-Hydroxy-trifluoroethyl-3-(2′-(trifluoroethylamino)ethyl)indol (5) und 1-Methyl-2-trifluoroethyl-1,2,3,4-tetrahydro-β-carbolin (6). Behandlung von2 mit Lithiumaluminiumhydrid, H2/Pd auf Aktivkohle und Natriumborhydrid führt jedoch zu Hydroxyspiroindolenin8, Hydroxy-bis(trifluoroacetyl)enaminospiroindolin9 und N-Ethyltryptamin (7). Die Ergebnisse werden diskutiert und die Mechanismen der zu den Produkten4–8 führenden Reaktionen werden vorgestellt.
    Notes: Summary Reduction of the title compound (2) with diborane furnishes 1-trifluoroethyl-3-(2′-(trifluoroethylamino)ethyl)-3-vinylindoline (4), 1-hydroxy-trifluoroethyl-3-(2′-(trifluoroethylamino)ethyl)indole (5), and 1-methyl-2-trifluoroethyl-1,2,3,4-tetrahydro-β-carboline (6). However, treatment of2 with lithium aluminum hydride, H2/Pd on charcoal, and sodium borohydride affords hydroxyspiroindolenine8, hydroxy-bis(trifluoroacetyl)enaminospiroindoline9, andN-ethyltryptamine7, respectively. The results are discussed and the mechanisms of the reactions leading to4–8 are presented.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00807261
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  • 4
    Electronic Resource
    Electronic Resource
    Nuclear magnetic resonance VI. Some quantitative applications of carbon-13 NMR spectroscopy to phenylindoles (1996)
    Springer
    Monatshefte für Chemie 127 (1996), S. 111-116 
    Details
    ISSN: 1434-4475
    Keywords: Phenylindoles ; Quantitative13C NMR ; Chromium(III) acetylacetonate
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Die Anzahl der durch jedes Signal der Phenylindole1,4 und5 repräsentierten Kohlenstoffatome wird durch Integration der nach Zusatz von Chrom(III)acetonylacetat als Relaxationsreagens aufgenommenen13C-NMR-Spektren bestimmt. Ihre chemischen Verschiebungen werden eindeutig zugeordnet; die Literaturwerte für4 werden bestätigt. Durch eine vergleichende Untersuchung der13C-chemischen Verschiebungen von1,4 und5 können jene von2 und3 ebenfalls zugeordnet werden. Dieortho-Kohlenstoffe der Phenylgruppe von4 sind gegenüber denpara-Kohlenstoffatomen zu höherem Feld verschoben. Für die 2- und 3-Phenyl-Substituenten von1–3 und5 kehren sich die Verhältnisse um, wahrscheinlich wegen sterischer und/oder elektronischer Effekte der benachbarten Phenylgruppe.
    Notes: Summary The number of carbons represented by each signal of the phenylindoles1,4, and5 is measured quantitatively by integration of their13C NMR spectra, recorded after adding chromium(III) acetylacetonate to the sample solutions as a paramagnetic relaxation agent. Their carbon chemical shifts are assigned unambiguously; the literature assignments of4 are confirmed. By a comparative study of the carbon chemical shifts of1,4, and5, those of2 and3 are also assigned. Theortho carbons of the phenyl group of4 resonate upfield with respect to thepara carbon. Theortho carbons of the 2- and 3-phenyl moieties of1–3 and5, however, are found to absorb downfield from the correspondingpara carbons, probably because of steric and/or electronic effects exerted by their neighbouring phenyl group.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00807416
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  • 5
    Electronic Resource
    Electronic Resource
    Electrical Conductivity of Quantum Size 2d Nanocomplex (2005)
    s.l. ; Stafa-Zurich, Switzerland
    Journal of metastable and nanocrystalline materials Vol. 23 (Jan. 2005), p. 335-338 
    Details
    ISSN: 1422-6375
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: A nanocomplex of Chromium oxide nanoparticles with biopolymer matrix of gumArabica is synthesized by natural self-assembly in chemical sol-gel route. Gum Arabica is chosen as base matrix due to its inherent biodegradable property. Experimental specimen of the said complex is prepared to satisfy near quantum size effect criterion. Due to near quantum size effect and spatial localization of nanoclusters, the developed specimen becomes an ideal 2D quantum well system.The longitudinal electrical conduction of the developed system is studied experimentally. Some of its structural aspects are also investigated to make the study conclusive. The dispersed cluster size is estimated by Transmission Electron Microscope (TEM) and X-ray diffraction (XRD). The results of I-V characteristics at temperatures 253 K show the distinctive features of localized energy levels. The spacing between energy levels near ground state to be comparable to the thermal energy at temperature 253 K for a cluster dimension below 10 nm. In this present study the developed specimens with the mentioned nanoclusters estimated from TEM and XRD as below 10 nm. The overall results are found to be encouraging
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/43/transtech_doi~10.4028%252Fwww.scientific.net%252FJMNM.23.335.pdf
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  • 6
    Electronic Resource
    Electronic Resource
    Nuclear magnetic resonance IIIFor Part II see K. M. Biswas, R. N. Dhara and H. Mallik, Indian J. Chem. in press.-13C NMR spectral studies on substituted indoles (1985)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 23 (1985), S. 218-220 
    Details
    ISSN: 0749-1581
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: 13C signal assignments of 3-ethyl-1-methylindole (1), 1-methyl-3-phenylindole (3), 1,3-dimethyl-2-phenylindole (5), 1-methyl-2,3-diphenylindole (10), 1,5-dimethyl-2,3-diphenylindole (12), 7-methoxy-2,3-diphenylindole (13), 7-methoxy-4-methyl-2,3-diphenylindole (14) and 1-(7-methoxy-4-methyl-2,3-diphenyl-6-indolyl)-1-(7-methoxy-2,3-diphenyl-4-indolyl)methane (15) are reported. Contrary to an earlier report on monophenylindoles, the para carbons of the phenyl groups of 3, 5, 10 and 12-15 resonate at lower frequencies than their ortho carbons. The methoxy carbon at position 7 in 15 absorbs at a higher frequency than other similar carbons in 13-15 owing to steric inhibition to resonance.
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mrc.1260230319
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