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  • 1
    Electronic Resource
    Electronic Resource
    Soil organic matter composition and pesticide bonding in sandy soils in relation to groundwater protection in the Northwest German Lower Plain (1996)
    Springer
    Biology and fertility of soils 23 (1996), S. 266-272 
    Details
    ISSN: 1432-0789
    Keywords: Key words Soil organic matter ; Microbial activity ; Groundwater contamination ; Pesticides ; Spodic horizons ; Landscape planning
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Geosciences , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract In sandy gleyic soils with a low groundwater table under arboriculture in Northwest Germany, a wide variation of groundwater pollution by pesticides has been observed. We therefore examined data on microbial activity and soil organic matter composition by wet chemistry, cross-polarization magic-angle spinning and 13C nuclear magnetic resonance, and pyrolysis–field ionization mass spectromy. However, neither microbial activity nor the soil organic matter composition of cultivated topsoils explained the differences in xenobiotic leaching into the groundwater. Data from Anthrosols suggested that these soils have a higher capacity for pesticide bonding because of high amounts of aromatic and carboxylic C moieties in the soil organic matter. However, despite the same pesticide inputs and time of application, the leached output from these soils was higher than that from the Podzols. Initial data from subsoil investigations suggest that the presence of a spodic horizon most likely reduces groundwater pollution by pesticides. Studies to assess fixation capacity and desorption kinetics in Bh horison seem warranted.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00335954
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Soil organic matter composition and pesticide bonding in sandy soils in relation to groundwater protection in the Northwest German Lower Plain (1996)
    Springer
    Biology and fertility of soils 23 (1996), S. 266-272 
    Details
    ISSN: 1432-0789
    Keywords: Soil organic matter ; Microbial activity ; Groundwater contamination ; Pesticides ; Spodic horizons ; Landscape planning
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Geosciences , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract In sandy gleyic soils with a low groundwater table under arboriculture in Northwest Germany, a wide variation of groundwater pollution by pesticides has been observed. We therefore examined data on microbial activity and soil organic matter composition by wet chemistry, cross-polarization magic-angle spinning and 13C nuclear magnetic resonance, and pyrolysis-field ionization mass spectromy. However, neither microbial activity nor the soil organic matter composition of cultivated topsoils explained the differences in xenobiotic leaching into the groundwater. Data from Anthrosols suggested that these soils have a higher capacity for pesticide bonding because of high amounts of aromatic and carboxylic C moieties in the soil organic matter. However, despite the same pesticide inputs and time of application, the leached output from these soils was higher than that from the Podzols. Initial data from subsoil investigations suggest that the presence of a spodic horizon most likely reduces groundwater pollution by pesticides. Studies to assess fixation capacity and desorption kinetics in Bh horison seem warranted.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00335954
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Synthese, koordinationschemische und massenspektrometrische Charakterisierung neuartiger carboxylsubstituierter N-(Thiocarbamoyl)-benzamidine (1990)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 332 (1990), S. 359-366 
    Details
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Synthesis, Coordination Chemistry and Mass Spectrometric Fragmentation of New N-(Thiocarbamoyl)-benzamidinesSyntheses of N-(thiocarbamoyl)benzamidines from benzimidoylchlorides and aromatic amino acids as starting materials are reported. The prepared compounds were used as ligands for complexing nickel(II) and copper(II)ions. The benzamidines were characterized by mass spectrometric methods. The fragmentation pattern of the benzamidines was derived from the corresponding MIKE-spectra.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prac.19903320313
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  • 4
    Electronic Resource
    Electronic Resource
    Flüssig-Flüssig-Extraktion von Metallionen mit LariatethernHerrn Professor Dr. E. Hoyer zum 60. Geburtstag gewidmet (1991)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 333 (1991), S. 413-421 
    Details
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Liquid-Liquid-Extraction of Metal Ions with Lariat Ethers.Lariat ethers of various ring size and substitution are synthesized and characterized by physical data and chemical analysis. The extraction behaviour of the crown compounds towards Na+, K+, Cs+ and Ag+ in a picric acid solution has been investigated. The extraction contants for 1:1 and 1:2 complexes are determined using the equilibrium distribution data. The results show that the flexible side chain in the investigated compounds has in no case a positive effect on the metal picrate extraction.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prac.19913330306
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  • 5
    Electronic Resource
    Electronic Resource
    Zur reversiblen Umwandlung von 3-Diethylamino-5-phenyl-1,2,4-dithiazolium-halometallaten in Metallchelate der 3-(Thio)benzoyl(thio)harnstoffeHerrn Prof. Dr. E. Hoyer zum 60. Geburtstag gewidmet (1991)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 333 (1991), S. 537-544 
    Details
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: About the Reversible Conversion of 3-Diethylamino-5-phenyl-1,2,4-dithiazoliumhalometallates into Metal Chelates of 3-(Thio)benzoyl(thio)ureasRedox reactions of 3-diethylamino-5-phenyl-1, 2,4-dithiazolium halometallates 1a-e and metal chelates (M = CuII (2 A), CoII (2 C), NiII (2 F)) of 3-thiobenzoylthioureat was studied by cyclic voltammetry. 1 are converted by reduction into 2. The mechanism of the oxidation of 2 A, C, F into 1a, d, e is dependent on the central ion.On formation of 1 a from copper(II) chelates of 3-benzoylthiourea 3 A by means of thionylchloride as well as by electrochemical oxidation 3-benzoylureas 4 A are formed as sideproducts.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prac.19913330404
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  • 6
    Electronic Resource
    Electronic Resource
    Säurestärke und Komplexbildung von Curcuminoiden (1988)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 330 (1988), S. 111-118 
    Details
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Acidity and Complex Formation of CurcuminoidsThe stoichiometric acid dissociation constants of curcumin 1a and derivatives as well as the stoichiometric stability constants of the Cu(II)- and Ni(II)-complexes of these substances have been determined by pH-potentiometric titrations in dioxane-water mixture.The influence of different substituents on the pKa-values and the stability constants is discussed. The complexing properties of the —CO—CH2—CO— structural element of the ligands are not significantly changed when the phenyl group is substituted by the styryl group. Solid CuL2-complexes have been characterized. The coordination of the ester group in the tricarbonyl ligand systems 4 was excluded by i.r. spectroscopy.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prac.19883300120
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  • 7
    Electronic Resource
    Electronic Resource
    Zur Reaktion von N-(N′,N′-Dialkyl(aryl)amino-thiocarbonyl)benzimidoylchloriden mit Kaliumthiocyanat (1988)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 330 (1988), S. 241-247 
    Details
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Reactions of N-(N′,N′-Dialkyl(aryl)amino-thiocarbonyl)benzimidoylchlorides with Potassium ThiocyanateThe treatment of the title compound N-(amino-thiocarbonyl)-benzimidoylchloride 1 with potassium thiocyanate leads in dependence on the solvents (methanol, acetic acid, acetone) either to the 1,3,5-thiadiazine-2-thione 2a-d or to the ring opened isothiocyanate 4a, b. In the case of methanol the N-(amino-thiocarbonyl)benzimidates were formed as by-products.The structure of the products is confirmed by analytical data and by chemical transformations. 2a reacts with methyl iodide to form the 2-methylthio-6-morpholino-4-phenyl-1,3,5-thiadiaziniumiodide 3a. From 4a and water the N-(morpholino-thiocarbonyl)benzamide 5a arises. The reaction of morpholine with 4a yields the benzamidine 6a.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prac.19883300210
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  • 8
    Electronic Resource
    Electronic Resource
    Zur Chemie der Acylthioharnstoffe. IIIAls II. Mitt. gilt: Lit. [1]; als I. Mitt.: J. Liebscher u. H. Hartmann, Z. Chem. 14, 470 (1974).. Bildung von 1,3,5-Thiadiazin-2-thionen bei Acylsenföl-Amin-Umsetzungen (1978)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 320 (1978), S. 647-650 
    Details
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: On the Chemistry of Acylthioureas. III. Synthesis of 1,3,5-Thiadiazine-2-thiones by the Reaction of Acylisothiocyanates with AminesIn course of synthesis of benzoyl-thioureas from benzoyl-isothiocyanate and sec. amines some new 6-amino-4-phenyl-1,3,5-thiadiazine-2-thione 5 are prepared and characterized chemically and spectroscopically.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prac.19783200418
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  • 9
    Electronic Resource
    Electronic Resource
    Synthesen und Eigenschaften Mono- und diphenylsubstituierter Monothio-β-dicarbonylverbindungen und ihrer Nickel(II)chelateHerrn Prof. Dr. Dr. h. c. H. G. O. Becker zum 60. Geburtstag gewidmet (1982)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 324 (1982), S. 292-298 
    Details
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Syntheses and Properties of Mono- and Disubstituted Monothio-β-dicarbonyl Compounds and their Nickel(II) chelatesReaction of phenylacetaldehyde with phosphorous oxichloride and dimethylformamide yielded 3-chloro-2-phenyl-propenal, which was converted into 2-phenyl-monothiomalonic dialdehyde 2 by treating with sodium sulfide nonahydrate. Furthermore the reactions of other mono- and diphenylsubstituted monothio-β-dicarbonyl compounds with aniline on the one side and nickel(II)acetate on the other side have been studied. It was shown, that compounds 1-6 react in different way with aniline yielding either sulfur free products or in case of 1 and 4 enaminothioketones, which are of interest as building blocks for syntheses.In contrast to this the nickel complexes of 1-6 indicates an one another similar, typical chelate structure, which have been elucidated by u.v.-vis-, i.r.- and x-ray photoelectron spectroscopy.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prac.19823240213
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  • 10
    Electronic Resource
    Electronic Resource
    d-NMR-Untersuchungen der behinderten Rotation am N—C(X)-Bindungsfragment. XV. Beeinflussung der Rotationsbarriere im NR2—C(X)—R1-Bindungsfragment durch elektronische und sterische SubstituenteneffekteHerrn Prof. Dr. Dr. h. c. H. G. O. Becker zum 60. Geburtstag gewidmet (1982)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 324 (1982), S. 29-45 
    Details
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: d-N.M.R. Investigations of the Restricted Rotation at the N—C(X)-Bonding Fragment. XV. Influence of the Rotational Barrier in the NR2—C(X)-R1-Bonding Fragment by Electronic and Steric Substituent Effects.The rotational barriers ΔG≠ of the restricted rotation about partial C,N-double bonds are determined for 4 series of urea-derivatives, and analogous compounds by complete lineshape analysis and approximation equations. Some general conclusions are drawn about the validity range of the approximations independence on the low temperature splitting Δν, the possible corrections within the margin of error and the internal temperature measurement. The dependence of the determined free enthalpies of activation about the effect of heteroatoms X, the NR2-substituents and the electronic and steric influence of the substituents R1 are discussed.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prac.19823240106
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