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  • Chemistry  (2)
  • biological control  (1)
  • General Chemistry
  • 1975-1979  (3)
  • 1979  (3)
Collection
Keywords
Publisher
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  • 1975-1979  (3)
Year
  • 1
    Electronic Resource
    Electronic Resource
    Kairomones and their use for management of entomophagous insects (1979)
    Springer
    Journal of chemical ecology 5 (1979), S. 673-680 
    Details
    ISSN: 1573-1561
    Keywords: Trichogramma ; Hymenoptera ; Trichogrammatidae ; kairomone ; Heliothis zea ; biological control ; pest management ; parasitoids
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract A kairomone from adultHeliothis zea (Boddie) scales is an important factor in the host selection process ofTrichogrammapretiosum Riley. If the host density is sufficiently high (i.e., 1 egg/500 cm2) and higher), a complete coverage or solid treatment of kairomone spray may be the optimum for increasing parasitization rates, but this is not the case at lower host densities (e.g., 1 egg/2000 cm2). At the lower densities, the kairomone must be distributed in such a way as to retain the parasitoids in the target area without inhibiting their movement from one ovi-position site to the next. Simulated moth scale particles appear to fill this need since their density can be regulated to provide the optimum frequency of parasitoid stimulation and thus maximum rates of parasitization at prevailing host densities.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00986552
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  • 2
    Electronic Resource
    Electronic Resource
    α-Substituierte Phosphonate. XXXIV. Zur Veresterung und N-Formylierung von α-Aminomethan-bisphosphonsäuren mit OrthoameisensäuretriethylesterHerrn Prof. Dr. Günther Hilgetag zum 70. Geburtstag gewidmet (1979)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 321 (1979), S. 361-369 
    Details
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: α-Substituted Phosphonates. XXXIV. Esterification and N-Formylation of α-Aminomethane-bisphosphonic Acids with TriethylorthoformateIn contrast to simple mono- and bisphosphonic acids esterification of dialkylaminomethanebisphosphonic acids with orthoformate (OAE) proceeds very slowly. Monoalkyl and monoarylaminomethanebisphosphonic acids, respectively react with OAE in constrast to analogous hydroxy compounds more readily primarily by formylating the N-atom and then esterification to formyl aminomethane bisphosphonictetraesters 10. Acetaminomethanephosphonic acid (12) reacts without N-formylation, while the aminomethanebisphosphonic acid (14) reacted to give a mixture of mono- and bis-formylated products 15 and 16. By acidic hydrolysis of 10 the ester- and formylgroups are splitt off, while the ester group can selectively be removed by reaction with Me3SiBr/H2O. - As shown by 1H-, 13C- and 31P-n.m.r. spectroscopy the phosphorylated formamides 10 exists in two rotameres, the ratio depending on the solvent. The n.m.r. signals could be correlated to E-resp. Z-form undoubtedly by using shift-agents or the benzene-diluting technique. A rotational barrier of 22,8 kcal for 10c could be calculated.
    Additional Material: 4 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prac.19793210303
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  • 3
    Electronic Resource
    Electronic Resource
    Derivate des Phosphorsäure - o - phenylenesters, XVIII. Zur Bromierung von o-substituierten aromatischen o-PhenylenphosphitenProfessor Kurt Issleib zum 60. Geburtstage gewidmet (1979)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 458 (1979), S. 108-112 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Derivatives of o-Phenylene Phosphates. XVIII. Bromination of o-substituted Aromatic o-Phenylene PhosphitesAryl-o-phenylene phosphites of the type 4 at room temperatures give with bromine by cyclization of the primary adduct the bromo-spirophosphorane 6A as the main product. As by products phosphorus tribromide, pentaoxyphosphoranes 10, and o-substituted phenyl-dibromophosphites 8 could be identified. The formation of the observed products can be explained by assumption of ligand-exchange reactions.
    Notes: Aryl-o-phenylenphosphite des Typs 4 geben bei Raumtemperatur mit Brom unter Cyclisierung des Primärproduktes als Hauptprodukt das Brom-spirophosphoran 6A; als Nebenprodukte wurden Phosphortribromid, Pentaoxyphosphorane 10 und o-subst. Phosphorigsäurephenylesterdibromide 8 nachgewiesen. Die Bildung der Produkte kann durch Ligandenübertragungsreaktionen erklärt werden.
    Additional Material: 2 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19794580115
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