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  • 1985-1989  (2)
  • 1980-1984  (2)
  • Organic Chemistry  (4)
  • Groundwater contamination
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  • 1
    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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    Paper (German National Licenses)
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  • 2
    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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    Paper (German National Licenses)
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  • 3
    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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    Paper (German National Licenses)
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  • 4
    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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    Paper (German National Licenses)
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