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  • 1
    Electronic Resource
    Electronic Resource
    Crystal structure and electrical properties of κ-((S,S)-DMBEDT-TTF)2ClO4 (1992)
    Weinheim : Wiley-Blackwell
    Advanced Materials 4 (1992), S. 33-35 
    Details
    ISSN: 0935-9648
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/adma.19920040106
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  • 2
    Electronic Resource
    Electronic Resource
    C-Substituierte 1,2,3,5-Dithiadiazoliumsalze und 1,2,3,5-Dithiadiazolyle (1994)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 336 (1994), S. 266-268 
    Details
    ISSN: 0941-1216
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Carbon Substituted 1,2,3,5-Dithiadiazolium Salts and 1,2,3,5-Dithiadiazolyles
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prac.19943360315
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  • 3
    Electronic Resource
    Electronic Resource
    The application of electrospray and neutral-loss mass spectrometry to the identification of the metabolites of S12813 in rat liver slices (1994)
    New York, NY : Wiley-Blackwell
    Rapid Communications in Mass Spectrometry 8 (1994), S. 361-365 
    Details
    ISSN: 0951-4198
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Notes: The metabolism of S12813, (3-{2-[4-phenyl piperazin-1-yl] ethyl}-2-oxo-2,3-dihydro oxazolo [4, 5-b] pyridine chlorohydrate), in rat liver slice incubates was examined by high performance liquid chromatography combined with mass spectrometry. Electrospray ionization was used together with tandem mass spectrometric techniques of analysis (MS/MS). Polar phase I and phase II metabolites were identified as C-oxidation products, which were then conjugated to form either sulphate or glucuronide metabolites. On the basis of the identifications made, a metabolic pathway of S12813 in rat liver slices has been proposed.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/rcm.1290080504
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  • 4
    Electronic Resource
    Electronic Resource
    Determination of chain stiffness and polydispersity from static light-scattering (1991)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part B: Polymer Physics 29 (1991), S. 589-600 
    Details
    ISSN: 0887-6266
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Chain stiffness is often difficult to distinguish from molecular polydisperity. Both effects cause a downturn of the angular dependence at large q2 (q = (4π/λ)sin θ/2) in a Zimm plot. A quick estimation of polydisperity becomes possible from a bending rod (BR) plot in which lim (c → 0) qRθ/Kc is plotted against q(〈S2〉z)1/2 = u. Flexible and semiflexible chains show a maximum whose position is shifted from umax = 1.41 for monodisperse chains towards larger values as polydispersity is increased, while simultaneously, the maximum height is lowered. Stiff chains display a constant plateau at large q, its value is πML where ML is the linear mass density. Using Koyama's theory, the number of Kuhn segments can be determined from the ratio of the maximum height to the plateau height, if the polydispersity index z = (Mw/Mn - 1)-1 is known. Thus, if the weight-average molecular weight Mw, is known, the contour length Lw, the number of Kuhn segments (Nk)w, the Kuhn segment length lk and the polydispersity of the stiff chains can be determined. The influence of excluded volume is shown to have no effect on this set of data. The reliability of this set can be cross-checked with the mean-square radius of gyration 〈s2〉z which can be calculated from the Benoit-Doty equation for polydisperse chains. Rigid and slightly bending rods exhibit no maximum in the BR plot, and the effect of polydispersity can no longer be distinguished from a slight flexibility if only static scattering techniques are applied.
    Additional Material: 13 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/polb.1991.090290508
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  • 5
    Electronic Resource
    Electronic Resource
    Chemo-enzymatische Synthese von Kohlenhydraten: Die Herstellung von L-Xylose und 2-Desoxy-L-xylo-hexose (1992)
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1992 (1992), S. 95-97 
    Details
    ISSN: 0170-2041
    Keywords: L-Xylose ; 2-Deoxy-L-xylo-hexose ; Enzymatic syntheses ; Carbohydrates ; Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Chemo-Enzymatic Synthesis of Carbohydrates: The Preparation of L-Xylose and 2-Deoxy-L-xylo-hexoseA synthetic approach to L-xylose (6) and 2-deoxy-L-xylo-hexose (8) has been developed. The strategy utilizes achiral starting materials and employs two enzymatic reactions to introduce the desired chiral centers. Rabbit muscle aldolase (RAMA)-catalyzed condensation of (3-phenylthio)propanal (1) with dihydroxyacetone phosphate (DHAP) affords the C-6 skeleton 2 with D-threo configuration between C-3 and C-4. Diastereoselective reduction of 2 with sorbitol dehydrogenase (SDH) introduces the final stereocenter of the tetrahydroxy derivative 3. After oxidation of sulfide 3 to the corresponding diastereotopic sulfoxides 4, L-xylose (6) is obtained by thermal elimination of phenylsulfenic acid followed by ozonolysis. 2-Deoxy-L-xylo-hexose (8) is yielded from 4 by a Pummerer rearrangement and subsequent reductive deprotection (DI-BAL-H) of the rearrangement product 7.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jlac.199219920119
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  • 6
    Electronic Resource
    Electronic Resource
    Structural variations of N-acetylneuraminic acid, 18. Synthesis of the side chain stereo and deoxy analogs of 5-acetamido-2,6-anhydro-3,5-dideoxy-D-erythro-L-manno-nononic acid (1990)
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1990 (1990), S. 1185-1195 
    Details
    ISSN: 0170-2041
    Keywords: Sialic acids ; Hemagglutinin inhibitors ; N-Acetylneuraminic acid, deoxygenation and epimerization ; Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The synthesis of 5-acetamido-2,6-anhydro-3,5-dideoxy-D- erythro-L-manno-nonic acid (3b, 7,8-epi2-2-d-2-HeqNeu5Ac) and sodium 5-acetamido-2,6-anhydro-3,5-dideoxy-L-threo-L-manno-nonate (6b, 8-epi-2-d-2-Heq-Neu5Ac) could be realized by transformation of 5-acetamido-3,5-dideoxy-L-glycero-L-altro-2-nonulopyranosonic acid (2a, 7,8-bis-epi-Neu5Ac) and 5-acetamido-3,5-dideoxy-3-L-glycero-D-galacto-2-nonulosonic acid (5a, 8-epi-Neu5Ac) into the corresponding peracetylated 2-chloro derivatives and subsequent catalytic hydrogenation. As this procedure could not be applied to the synthesis of the 7-epi, 7-deoxy and 8-deoxy derivatives a new strategy, which started with the methyl 5-acetamido-2,6-anhydro-3,5-dideoxy-D-erythro-L-manno-nonoate (1e), was designed. For this purpose, a gram-scale preparation of 1e was developed. Transformation of protecting groups and radical reduction of selectively introduced tolylthiocarbonate groups led to the corresponding 5-acetamido-2,6-anhydro-3,5,7-trideoxy-D-glycero-L-manno-nonoic acid (12b, 2,7-d2-2Heq-Neu5Ac) and sodium 5-acetamido-2,6-anhydro-3,5,8-trideoxy-D-glycero-L-manno-nonate (11b, 2,8-d2-2Heq-Neu5Ac). An oxidation  -  reduction sequence yielded 5-acetamido-2,6-anhydro-3,5-dideoxy-D-threo-L-manno-nonoic acid (9c, 2d-2Heq-7-epi-Neu5Ac). Also the sialic acid analog 6b could be prepared according to this newly designed strategy.
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jlac.1990199001216
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  • 7
    Electronic Resource
    Electronic Resource
    Indium-assisted allylation in carbohydrate chemistry: A convenient route to D-glycero-D-galacto- and D-glycero-L-galacto-heptose (1994)
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1994 (1994), S. 73-78 
    Details
    ISSN: 0170-2041
    Keywords: Allylation, indium-assisted ; Aldoheptoses ; Catalytic osmylation ; Indium-assisted allylation ; Carbohydrates ; Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Starting with unprotected D-pentoses 1-4 we achieved a chain elongation reaction by utilizing indium-assisted allylation. After acetylation, the polyol derivatives 1a-4a were transformed into the corresponding α,β-unsaturated aldehydes 1b-4b. Protection of the carbonyl group yielded the diethyl acetals 1c-4c. Subsequent dihydroxylation of the double bond by catalytic osmylation followed by acetylation of the newly introduced hydroxyl functions gave a mixture of diastereomeric products. However, only those diastereomers could be easily separated by column chromatography which were derived from 1c and 2c, giving access to D-glycero-D-galacto and D-glycero-L-galacto precursor 5 and 7, respectively. Final deprotection yielded the title aldoheptoses 6 and 8.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jlac.199419940113
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  • 8
    Electronic Resource
    Electronic Resource
    XPS-investigation of titanium modified MFI-type zeolites (1994)
    Chichester [u.a.] : Wiley-Blackwell
    Surface and Interface Analysis 22 (1994), S. 403-406 
    Details
    ISSN: 0142-2421
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Notes: The chemical bonding of titanium in MFI-type zeolites (Ti-silicalite) has been investigated using x-ray photoelectron spectroscopy (XPS). Different titanium silicalites as well as pure titania (anatase) have been analysed. We have found a distinctively higher binding energy of the Ti 2p photoelectrons in Ti-silicalite than in titania- or anatase-containing silicalite. Ti has the same oxidation state in all solids under study. We attribute the difference in binding energy to different oxygen coordinations of the titanium in the framework of Ti-silicalite (tetrahedral) and anatase (octahedral). This suggestion is supported by XPS-studies of TiO2—SiO2 glasses and TiO2—SiO2 mixed oxides where a similar shift was found. Additional Raman-spectroscopy investigations of the samples indicate the existence of tetrahedrally coordinated titanium by the appearance of a characteristic band at ∼ 965 cm-1. Non-framework TiO2 species containing octahedrally coordinated titanium could also be distinguished by XPS. Further Ti incorporation is indicated by the expansion of the unit cell which is related to the Ti 2p intensity for the framework titanium.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/sia.740220187
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  • 9
    Electronic Resource
    Electronic Resource
    Microgels by intramolecular crosslinking of poly(allylamine) single chains (1991)
    Basel : Wiley-Blackwell
    Die Makromolekulare Chemie, Rapid Communications 12 (1991), S. 645-652 
    Details
    ISSN: 0173-2803
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/marc.1991.030121107
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  • 10
    Electronic Resource
    Electronic Resource
    Flüssige Kohlenwasserstoffe aus Altpapier und Müll (1992)
    Weinheim : Wiley-Blackwell
    Chemie Ingenieur Technik - CIT 64 (1992), S. 364-365 
    Details
    ISSN: 0009-286X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cite.330640417
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