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  • 1
    Electronic Resource
    Electronic Resource
    The rearrangement of 11,13-dibromo-9,10-dimethoxy-9,10-propanoanthracen-12-ones to the correspondingFavorskii products (1997)
    Springer
    Monatshefte für Chemie 128 (1997), S. 79-83 
    Details
    ISSN: 1434-4475
    Keywords: Allylic rearrangement ; Tetrabromoacetone ; 9,10-Dimethoxy-9,10-propanoanthracen-12-ones ; Ring contraction ; Molecular mechanics calculations (MM2)
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung UnterFavorskii-Bedingungen (MeOH/KOH, 60°C) entstehen auscis- undtrans-11,13-Dibrom-9,10-dimethoxy-9,10-propanoanthracen-12-on derFavorskii-Ester5a und das α-Keto-Acetal5b in 46% Gesamtausbeute. Fast alle Reaktionen ergeben ein einziges Isomeres, von dem mittels molekularmechanischer Berechnungen gezeigt werden konnte, daß es sich dabei um das energetisch günstigere Produkt handelt.
    Notes: Summary Submittingcis- andtrans-11,13-dibromo-9,10-dimethoxy-9,10-propanoanthracen-12-one (4a,b) toFavorskii conditions (MeOH/KOH, 60°C) afforded theFavorskii ester5a and the α-keto acetal5b in 46% overall yield. Almost all reactions resulted in the formation of a single isomer which could be shown to be the most favored one by molecular mechanics calculations (MM2).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00807641
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  • 2
    Electronic Resource
    Electronic Resource
    Synthesis and reactions of new 4-chloro-2-methylpyrimidino[4′,5′:4,5]thiazolo[3,2-a]-benzimidazoles (1997)
    Springer
    Monatshefte für Chemie 128 (1997), S. 1133-1141 
    Details
    ISSN: 1434-4475
    Keywords: Pyrimidothiazolobenzimidazole ; Chlorination ; Nucleophilic substitution ; Condensation ; Pharmacological interest
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung 4-Chlor-2-methylpyrimidino[4′,5′:4,5]thiazolo[3,2-a]benzimidazol (3) wurde durch Chlorierung von2, welches auch direkt zu 2-Methylpyrimidino[4′,5′:5,4]thiazolo[3,2-a]-benzimidazol-4-thiol (4) umgesetzt werden kann, hergestellt. Nucleophile Substitution von3 mit Alkoholen, Phenolen, primären Aminen, sekundären Aminen, Natriumazid und Mercaptoessigsäure ergab die entsprechenden Derivate. Das Thiolderivat4 wurde mit Alkyl/Alkarylhalogeniden, Phenacylbromidderivaten, Bromaceton, Chloraniliden, Brommalonsäureester und Bromessigsäureethylester zu potentiell pharmakologisch interessanten Verbindungen umgesetzt.
    Notes: Summary 4-Chloro-2-methylpyrimidino[4′,5′:4,5]thiazolo[3,2-a]benzimidazole (3) was prepared by chlorination of2 which could also be converted directly to 2-methylpyrimidino[4′,5′:4,5]-thiazolo[3,2-a]benzimidazol-4-thiol (4). Nucleophilic substitution of3 with alcohols, phenols, primary amines, secondary amines, sodium azide, and mercaptoacetic acid gave the corresponding derivatives. The thiol derivative4 was reacted with alkyl/aralkyl halides, phenacyl bromide derivatives, bromoacetone, chloroanilides, bromomalonic ester, and ethyl bromoacetate to afford compounds of potential pharmacological interest.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00807563
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  • 3
    Electronic Resource
    Electronic Resource
    Enzyme-analogue built polymers and their use for the resolution of racemates
    Amsterdam : Elsevier
    Tetrahedron Letters 14 (1973), S. 4329-4332 
    Details
    ISSN: 0040-4039
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/S0040-4039(01)87213-0
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  • 4
    Electronic Resource
    Electronic Resource
    The level of trigonelline and other quaternary ammonium compounds in tomato leaves in ratio to the changing nitrogen supply (1988)
    Springer
    Plant and soil 109 (1988), S. 285-287 
    Details
    ISSN: 1573-5036
    Keywords: choline ; Fusarium oxysporum ; Lycopersicon esculentum ; nitrogen supply ; OPLC ; Solanaceae ; tomato ; trigonelline ; Nε-trimethyl-L-lysine
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract The choline, trigonelline, Nε-trimethyl-L-lysine content in the leaf tissue of tomato plants grown with varying amounts of nitrate nitrogen was determined by the OPLC method. The choline and trigonelline level in tomato leaves increased in direct ratio to the nitrogen supply. The possible role of these compounds in the physiology and in the augmented resistance of plants to nectrotizing stresses is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02202097
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  • 5
    Electronic Resource
    Electronic Resource
    Natural convection heat transfer from square cylinders (1984)
    Springer
    Flow, turbulence and combustion 41 (1984), S. 93-104 
    Details
    ISSN: 1573-1987
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Experiments were carried out to measure the average natural convection heat transfer from the outside surface of isothermal square cylinders of different lengths and side-lengths at different angles of inclination in both the laminar and the turbulent regions. The heat transfer was found to depend on the side-length and the inclination. Due to the presence of edge-effects the heat transfer coefficient always exceeded that of the vertical plate and that of “the equivalent circular cylinder” in the same condition. General equations representing the experimental results are suggested.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00419361
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  • 6
    Electronic Resource
    Electronic Resource
    Synthesis of 9,10-Dihydro-9,10-propanoanthracene-12-ones from Anthracenes and Oxyallyl Cation Intermediates Generated by the the BSA [N,O-Bis(trimethylsilyl)acetamide] Method (1994)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 127 (1994), S. 1755-1760 
    Details
    ISSN: 0009-2940
    Keywords: Anthracenes ; Oxyallyl cations ; Ketones, α,α'-oligobromo- ; Dibenzohomobarrelenes ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Sonication of a zinc/copper couple, N,O-bis(trimethylsilyl)-acetamide (BSA) and α,α'-oligobromo ketones in benzene gives rise to oxyallyl intermediates which cycloadd to anthracene. Starting from 1,1,3,3-tetrabromoacetone (2a) and anthracene (1a), we obtained 11,11,13-tribrominated adduct 4 as the major product (42%). The expected 11,13-dibrominated adduct trans-3 was formed as a minor product (5%), but it became the main product when the known oxyallyl methodology was applied. Dibenzohomobarrelenes 9 and 17 were prepared by short routes.
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19941270927
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  • 7
    Electronic Resource
    Electronic Resource
    Enzyme-analogue built polymers, 4Part 3: cf.1.. On the synthesis of polymers containing chiral cavities and their use for the resolution of racemates (1977)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 178 (1977), S. 2799-2816 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: With the aid of a chiral template molecule functional groups could be placed in a highly crosslinked polymer in such a way that they are present in a chiral cavity in a given stereochemistry. By this method methyl, resp. 4-nitrophenyl α-D-mannopyranoside-2,3; 4,6-di-O-(4-vinylphenylboronate) (1a, resp. 1b) were copolymerized to macroporous polymers from which the templates methyl, resp. 4-nitrophenyl α-D-mannopyranoside (2a, resp. 2b) could be split off in return. It could be shown that such polymers with two boronic acid groupings within the chiral cavity possess a good ability for the resolution of racemates of the template used. In the case of the separation of the enantiomers of 2b separation factors up to 2,27 could be obtained. The overall optical enrichment in a chromatographic separation amounted to 87%.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1977.021781004
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  • 8
    Electronic Resource
    Electronic Resource
    Enzyme-analogue built polymers, 5Part 4: cf.1.. On the specificity distribution of chiral cavities prepared in synthetic polymers (1977)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 178 (1977), S. 2817-2825 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: By copolymerization of 4-nitrophenyl α-D-mannopyranoside-2,3;4,6-di-O-(4-vinylphenylboronate) (1) with ethylene dimethacrylate and methyl methacrylate macroporous polymers were obtained, in which after cleavage of the template, 4-nitrophenyl α-D-mannopyranoside (2), chiral cavities with two boronic acid groups are present. From the dependence of the specificity for the resolution of racemates on the covering percentage of the cavities the frequency distribution of the specificity of the cavities could be deduced. With the distribution curve at hand the factors are discussed, which govern the conservation and the loss of specificity.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1977.021781005
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  • 9
    Electronic Resource
    Electronic Resource
    Mannich Reaction with 5-Phenylcyclohexan-1,3-dione (1984)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 326 (1984), S. 683-685 
    Details
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prac.19843260425
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  • 10
    Electronic Resource
    Electronic Resource
    Utilization of Macroporous Polymer Containing Phenylboronic Acid Groups in the solid- phase synthesis (1988)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 330 (1988), S. 71-78 
    Details
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Ethylene glycol (4-vinylphenyl-)-boronate (2) was copolymerized with technical divinylbenzene to highly crosslinked macroporous polymer (P2). On treatment of P2 with methanol/water, 75% of the polymer-bound ethylene glycol could be split-off, under formation of the desired polymer (P1) with free phenylboronic acid groups. The utility of P1 in the solid-phase synthesis, for instance its conversion to polymer-supported phenol, and as polymer-supported protecting group for diols was investigated.
    Additional Material: 2 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prac.19883300114
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