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  • Chemistry  (29)
  • Organic Chemistry  (17)
  • 1
    Electronic Resource
    Electronic Resource
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 318 (1976), S. 635-642 
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: On the Electrochemical Behaviour of Asymmetrically Bridged DiquinonesRedox potentials and pK-values of tetravalent asymmetrically bridged diquinones, quinhydrones, and hydroquinones are described and the influences of substituents on these characteristics are discussed.
    Notes: Es werden Redoxpotentiale und pK-Werte von tetravalenten, unsymmetrisch verbrückten Dichinonen, Chinhydronen und Hydrochinonen beschrieben und Substituenten-einflüsse auf diese Eigenschaften diskutiert.
    Additional Material: 3 Ill.
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  • 2
    Electronic Resource
    Electronic Resource
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 327 (1985), S. 45-50 
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Electrochemical Carboxylation of Cinnamoyl-1,1-bis(alkylthio)ethylenesCinnamoyl-1,1-bis(alkylthio)ethylenes (1a-1h) are reduced electrochemically in the presence of carbondioxide in aprotic media. The attack of CO2 takes place either in 1- or 5-position of cinnamoyl-1, 1-bis(alkylthio)ethylenes (1a-1h) depending on the nature of the aryl substituents. If CO2 reacts in position 1 carbonic acids 3 are obtained, reaction of carbondioxide in 5- position leads to the acids 2. The effects of different aryl substituents on the halfwave potentials and the preparative electrolyses have been investigated.
    Additional Material: 1 Ill.
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  • 3
    Electronic Resource
    Electronic Resource
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 327 (1985), S. 823-828 
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Electrochemical Cleavage of 3-Halogen-1,2,4-thiadiazoles to Cyanimidothiocarbonates3-Halogen-1,2,4-thiadiazole-5-sulfenylchlorides (5a-j) are easily accessible by the halogenation of eyanimidodithiocarbonates (1). As electrophilic synthetic building blocks they react with basic olefines or electron-rich aromates to the corresponding alkylthio-or arylthio derivatives. The electrochemical reduction of these compounds led to substituted cyanimidomithiocarbonates (7a-e), not being accessible otherwise.
    Additional Material: 2 Ill.
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  • 4
    Electronic Resource
    Electronic Resource
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 327 (1985), S. 487-504 
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Derivatization of Amines with 4-Substitured 7-NitrobenzofurazansElectrophilc derivatives of 4-nitro-benzofurazan with different reactivities were used to synthesize 28 new mono- and disubstituted 4-amino-7-nitrobenzofurazans 2b, 2d, 2f-2i, 2l, 2m-2n, 3b-3f, 3h-3j, 4e-4d, 4f-4k, 4m, 4o-4p. A reaction mechanism is proposed on the basis of the differences of the reactivities and a preliminary kinetic examination. The acid character of the N—H-function in monosubstituted compounds is demonstrated by means of spectroscopical investigation of pKa-values.Data from i.r., u. v./vis, and fluorescence studies are offered.
    Additional Material: 3 Ill.
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  • 5
    Electronic Resource
    Electronic Resource
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 331 (1989), S. 545-551 
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Electrochemical Synthesis of 1,1-Dichloro-4-methylpenta-1,3-dieneReaction of 1,1,1-trichloro-4-methylpent-3-en-2-ol (2) with inorganic acid halides yielded several polychloroalkenes (3-5). These compounds were utilized for the electrochemical synthesis of 1,1-dichloro-4-methylpenta-1,3-diene (1).
    Additional Material: 1 Tab.
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  • 6
    Electronic Resource
    Electronic Resource
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 319 (1977), S. 561-567 
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Electrochemical Synthesis of 2, 2-Dichloroethenyl-dialkyl-phosphoric Acid EstersThe reaction of O-1,2,2,2-tetrachloroethyl phosphorodichloridate 3 with alcohols or phenols gives symmetrical or unsymmetrical O, O-diorgano-O-1,2,2,2-tetrachloroethyl phosphates 2, which can be reduced electrochemically. In this reaction two vicinal chlorine atoms are eliminated. This reaction results in compounds with high biological activity, especially as insecticides. The synthesis and the polarographic behaviour of various O, O-di-organo-O-1,2,2,2-tetrachloroethyl phosphates 2 as well as the preparative techniques of the electrochemical elimination of chlorine are described.
    Notes: Ausgehend von O-(1,2,2,2-Tetrachloräthyl)-phosphorsäuredichlorid 3 entstehen durch Umsetzung mit Alkoholen und Phenolen symmetrische oder asymmetrische O, O-Diorgano-O-(1,2,2,2-tetrachloräthyl)-phosphate 2, aus denen sich elektrochemisch zwei vicinale Chloratome abspalten lassen. Man erhält Verbindungen der biologisch, insbesondere insektizid, hochwirksamen Klasse der O, O-Diorgano-O-(2,2-dichlorvinyl)-phosphate 1. Es werden Herstellung und polarographisches Verhalten verschiedener O, O-Diorgano-0-(1,2,2,2-tetrachloräthyl)-phosphate 2 sowie die präparative Durchführung der elektrochemischen Chlorabspaltung beschrieben.
    Additional Material: 1 Ill.
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  • 7
    Electronic Resource
    Electronic Resource
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 326 (1984), S. 971-978 
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Reactions of a Technical Fraction of Butene with TrichloroacetaldehydeIn pyrolysis plants for gasoline production a C4-fraction is formed containing isobutene, but-1-ene and but-2-ene as main products. The reactive separation of this fraction represents an industrial problem. One way to solve this problem is the reaction of trichloroacetaldehyde with these components to form addition products. The favoured reaction is the formation of 1,1,1-trichloro-4-methyl-pent-4-en-2-ol (1) and 1,1,1-trichloro-4-methyl-pent-3-en-2-ol (2) from iso-butene. The other isomers react very slowly. The influence of different reaction parameters was investigated to find a method for a reactive separation of the C4-fraction.
    Additional Material: 1 Ill.
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  • 8
    Electronic Resource
    Electronic Resource
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 328 (1986), S. 261-274 
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: UV-VIS- and IR-Spectroscopic Studies with N-Substituted 4-Amino-7-nitro-benzofurazansStarting from spectra of parent substance benzofurazan the influence of different functional groups (NO2, OH, NH2, NHAlk, NAlk2, NHAr, NArAlk) in 4- and (or) 7-position on the shape of spectra and the intensity of individual bands was examinated. It was tried to assign spectral bands to defined absorptions in the u.v./vis and i.r. range. The long-wave band in the solution-VIS-spectra of N-substituted 4-amino-7-nitrobenzofurazans was identified as a charge-transfer band. By the use of constants α, β, and π* by Kamlet and Taft the influence of different properties of solvents was correlated with band shifts in the UV/VIS range. A qualitative correlation was found between \documentclass{article}\pagestyle{empty}\begin{document}$ \bar \nu _{{\rm max}} $\end{document} of the long-wave band in the VIS-spectra, the polarographic half wave potential E 1/2 and the sum of polar substituent constants Σσ* of Taft. These proportions were plotted in a three-dimensional diagram.
    Additional Material: 4 Ill.
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  • 9
    Electronic Resource
    Electronic Resource
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 330 (1988), S. 147-153 
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Electrochemical Carboxylation of Cyclic Ketene-S,S-acetales
    Additional Material: 2 Ill.
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  • 10
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 373 (1970), S. 1-7 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: The anodic behaviour of tertiary phosphines and arsines, secundary phosphines and compounds with P—P bonds was investigated by voltammetric and polarographic methods using a carbon paste electrode (CPE).
    Notes: Das anodische Verhalten von tertiären sowie sekundären Phosphinen, tertiären Arsinen und Verbindungen mit P—P-Bindungen wurde sowohl polarographisch als auch voltammetrisch mit einer Kohlenstoffpasteelektrode untersucht.
    Additional Material: 4 Ill.
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