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  • 11
    Electronic Resource
    Electronic Resource
    Mononuclear Benzoylhydrazide Complexes of Cu2+, Fe3+ and V5+O and Fe2+ sulphate. Single crystal X-ray and E.P.R. data of the Cu2+ complex (1990)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 332 (1990), S. 293-299 
    Details
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Benzoyl hydrazide monoligand complexes [M(BzH)]n+, where M = Cu2+, Fe2+, Fe3+ and V5+O are prepared and their physical data reported. X-ray single crystal diffraction of Cu(BzH)CI2 reveal a nearly square planar configuration around the Cu2+; the benzoyl hydrazide molecule acting as a bidentate ligand with the CO and NH2 groups as coordinate sites and the partial contribution of the chloride ions as well. E.p.r. showed a low spin orbital coupling (500 cm-1) versus 830 cm-1 for the free Cu2+ ion; obviously coordinate bond chelation for the Cu2+ ion is envisaged.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prac.19903320303
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  • 12
    Electronic Resource
    Electronic Resource
    Crystal and Molecular Structure of Ambrosin and Damsin, sesquiterpene lactone isolates of Ambrosia maritima L (1988)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 330 (1988), S. 182-190 
    Details
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Ambrosia maritima L. growing wild in central Sudan contained substantial amounts of two principal sesquiterpene lactones, ambrosin and damsin. 1H, 13C-n.m.r.'s and X ray crystal analyses of these are discussed.Much interest and published results on the sesquiterpene plant isolates [1 - 9], the pseudoguiano-lides, ensued from their pharmacological (eg. mollusicidal) activity of the compositae family and in particular the Ambrosinae. From the genus Ambrosia (Compositae, Heliantheae, subtribe Ambro-sinae) several pseudoguianolides (eg. ambrosonolides) were isolated [7 - 12]. Recently, two pseudo-guianolides, damsin and ambrosin were isolated from A. Maritima L. sp. and other six more of these lactones were reported to occur in this species [4].The structures of these compounds were exclusively established through 1H- and 13C-n.m.r. studies which in certain cases were by no means conclusive [4].
    Additional Material: 6 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prac.19883300204
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  • 13
    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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  • 14
    Electronic Resource
    Electronic Resource
    Die Struktur des γ-Naphthocyclinons (1983)
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1983 (1983), S. 503-509 
    Details
    ISSN: 0170-2041
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: The structure of the γ-NaphthocyclinoneThe crystal structure of γ-naphthocyclinone (1) confirms the chemical and spectroscopic results and shows the configuration of the central bicyclo[3.2.1]octadienone ring to be 6′R, 8′S. The overall shape of 1 resembles a roof with a fold angle of 110° between the two halves of the molecule. The 6′-acetoxy group is situated above the chromophore next to the methylene bridge
    Notes: Die Kristallstruktur des γ-Naphthocyclinons (1) bestätigt die chemischen und spektroskopischen Befunde und weist die Konfiguration im zentralen Bicyclo[3.2.1]octadienon-System als 6′R, 8′S aus. 1 hat eine dachförmige Gestalt; der Winkel zwischen den Molekülhälften beträgt 110°. Die 6′-Acetoxygruppe steht über dem Chromophor in Nachbarschaft zur Methylenbrücke.
    Additional Material: 4 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jlac.198319830314
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  • 15
    Electronic Resource
    Electronic Resource
    Synthesis of the α-methyl ketoside of 5-amino neuraminic acid methyl ester and its corresponding 5-myristoyl and 5-cyclopropanoyl derivative (1990)
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1990 (1990), S. 1111-1114 
    Details
    ISSN: 0170-2041
    Keywords: Sialic acid, 5-azido- ; Neuraminic acid, N-acyl derivatives ; Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: This communication describes the first synthesis of the α-methyl ketoside of an N-unprotected neuraminic acid in the form of its methyl ester (Neu5NH21Me-α-2Me) (5a). This compound is a valuable intermediate for the synthesis of unnatural N-substituted sialic acids. Syntheses of Neusmyristoyl1me-α-2Me (5b) and Neuscyclopropanoyl1me-α-2Me (5c) are presented.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jlac.1990199001201
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