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'Pyridinium Salts' in keywords
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1Author    Von Alkoholat, Wolf-H GiindelRequires cookie*
 Title    Untersuchungen an quartären Pyridiniumsalzen, X [1] Eine Kondensationsreaktion von 3-Cyanpyridiniumsalzen bei Einwirkung A Condensation Reaction of 3-Cyanopyridinium Salts on Addition of Alcoxides  
 Abstract    1-Benzyl-3-cyanopyridinium salts, in the benzyl moiety differently substituted, react in boiling alcohol with alcoxides to derivatives of hexahydro-dipyrido[l,2-a:3',2'-c]-pyrrole. At 20 °C occurs rearrangement to derivatives of 2-amino-3-pyridinecarbaldehyde. 
  Reference    Z. Naturforsch. 35b, 490—493 (1980); eingegangen am 12. Dezember 1979 
  Published    1980 
  Keywords    Pyridinium Salts, Condensationreaction, Rearrangement 
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 TEI-XML for    default:Reihe_B/35/ZNB-1980-35b-0490.pdf 
 Identifier    ZNB-1980-35b-0490 
 Volume    35 
2Author    Wolf-H GündelRequires cookie*
 Title    Reaktionen von Cyanpyridinium-Salzen mit Hydroxylamin Investigations of Quaternary Pyridinium Salts, XI [1] Reactions of Cyanopyridinium Salts with Hydroxylamine  
 Abstract    The preparation of quaternary pyridinium salts with amidoxime group in 2-, 3-and 4-position is described. The isomer with the substituent in 3-position rearranges on addition of base to a l-hydroxy-2-imino-3-pyridinecarbaldimine. The reaction of 3-cyano-pyridinium salts with hydroxylamine and potassium terf-butoxide gives derivatives of dipyrido[l,2-a: 3',4'-c]pyrrole. 
  Reference    Z. Naturforsch. 35b, 896—901 (1980); eingegangen am 21. März 1980 
  Published    1980 
  Keywords    Pyridinium Salts, Rearrangement, Condensation Reaction 
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 TEI-XML for    default:Reihe_B/35/ZNB-1980-35b-0896.pdf 
 Identifier    ZNB-1980-35b-0896 
 Volume    35 
3Author    Wolf-H GündelRequires cookie*
 Title    Reaktion von Carbonsäureamiden mit Pseudobasen der Pyridinreihe Investigations of Quaternary Pyridinium Salts, XIII [1] Reaction of Carboxamides with Pseudobases from Pyridine Derivatives  
 Abstract    Pyridinium salts react in aqueous solution to pseudobases, which give on addition of carboxamides N-(1,4-Dihydro-4-pyridyl)-carboxamides. 
  Reference    Z. Naturforsch. 35b, 1431—1434 (1980); eingegangen am 31. Juli 1980 
  Published    1980 
  Keywords    Pyridinium Salts, Pseudobases, Insertion Reaction 
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 TEI-XML for    default:Reihe_B/35/ZNB-1980-35b-1431.pdf 
 Identifier    ZNB-1980-35b-1431 
 Volume    35 
4Author    Wolf-H GündelRequires cookie*
 Title    Untersuchungen an quartären Pyridinium-Salzen, XTV [1] Dihydropyridyl-oxiinether Investigations of Quaternary Pyridinium Salts, XIV [1] Dihydropyridyl-oxime-ethers  
 Abstract    Pyridinium Salts with electron-withdrawing groups in the 3-position react with aliphatic ketoximes under basic conditions to lipophilic addition products, 6-(alkylideniminoxy)-1,6-dihydropyridines. 
  Reference    Z. Naturforsch. 36b, 1031—1036 (1981); eingegangen am 21. April 1981 
  Published    1981 
  Keywords    Pyridinium Salts, Insertion Reaction, Oximes 
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 TEI-XML for    default:Reihe_B/36/ZNB-1981-36b-1031.pdf 
 Identifier    ZNB-1981-36b-1031 
 Volume    36 
5Author    Wolf-H GündelRequires cookie*
 Title    Untersuchungen an quartären Pyridinium-Salzen, XVII [1] Cyclopeptidartige Verbindungen aus Salzen von Nikotinoylaminosäureamiden Investigations of Quaternary Pyridinium Salts, XVII [1] Cyclopeptide-like Substances from Salts of the Amides of Nicotinoylamino Acids  
 Abstract    The amides of nicotinoylamino acids were prepared and alkylated to the quaternary salts lf—n. The a-amino acid moiety in 1 is S configurated. The salts 1 cyclise under the influence of base to give the cyclopeptide-like substances 4, 5 and 7, with seven-or fourteen (sixteen, eighteen-) membered rings, respectively. 
  Reference    Z. Naturforsch. 40b, 305—312 (1985); eingegangen am 26. September 1984 
  Published    1985 
  Keywords    Pyridinium Salts, Insertion Reaction, Cyclopeptides 
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 TEI-XML for    default:Reihe_B/40/ZNB-1985-40b-0305.pdf 
 Identifier    ZNB-1985-40b-0305 
 Volume    40 
6Author    Wolf-H GündelRequires cookie*
 Title    Untersuchungen an quartären Pyridinium-Salzen, XV [1] Pseudobasen und Redoxprodukte bei der Umsetzung von Pyridinium-Salzen mit Alkoholat Investigations of Quaternary Pyridinium Salts, XV [1] Pseudobases and Redox Products in the Reaction of Pyridinium Salts with Alcoxides  
 Abstract    Mono-and diquaternary pyridinium salts substituted in 3-position with electron with-drawing groups, react with alcohols under basic conditions to give 6-alcoxy-l,6-dihydro-pyridines. Symmetric dipyridinium salts react in aqueous alkaline solution to products with 6-pyridone and dihydropyridine moiety. This redox reaction depends on the length of the bridge connecting the pyridinium rings. Pyridinium salts can be reduced by aluminiumtriisopropoxide to 1,4-dihydropyridines. 
  Reference    Z. Naturforsch. 38b, 873—883 (1983); eingegangen am 21. Februar 1983 
  Published    1983 
  Keywords    Pyridinium Salts, Insertion Reaction, Redox Reaction 
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 TEI-XML for    default:Reihe_B/38/ZNB-1983-38b-0873.pdf 
 Identifier    ZNB-1983-38b-0873 
 Volume    38 
7Author    E. F. Elstner, H. P. Fischer, W. Osswald, G. KwiatkowskiRequires cookie*
 Title    Superoxide-and Ethane-Formation in Subchloroplast Particles: Catalysis by Pyridinium Derivatives  
 Abstract    Oxygen reduction by chloroplast lamellae is catalyzed by low potential redox dyes with E'0 values between -0 .3 8 V and -0 .6 V. Compounds o f E'0 values o f -0 .6 7 V and lower are inactive. In subchloroplast particles with an active photosystem I but devoid of photosynthetic electron transport between the two photosystems, the active redox compounds enhance chlorophyll bleaching, superoxide formation and ethane production independent on exogenous substrates or electron donors. The activities o f these compounds decrease with decreasing redox potential, with one exception: 1-methyl-4,4'-bipyridini urn bromide with an E'0 value o f lower -1 V (and thus no electron acceptor o f photosystem I in chloroplast lamellae with intact electron transport) stimulates light dependent superoxide formation and unsaturated fatty acid peroxidation in sub­ chloroplast particles, maximal rates appearing after almost complete chlorophyll bleaching. Since this activity is not visible with compounds with redox potentials below -0 .6 V lacking the nitrogen atom at the 1-position o f the pyridinium substituent, we assume that 1 -methyl-4,4'-bi-pyridinium bromide is "activated" by a yet unknown light reaction. 
  Reference    Z. Naturforsch. 35c, 770—775 (1980); received May 23/June 6 1980 
  Published    1980 
  Keywords    Superoxide, Lipid Peroxidation, Ethane, Chloroplasts, Pyridinium Salts 
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 TEI-XML for    default:Reihe_C/35/ZNC-1980-35c-0770.pdf 
 Identifier    ZNC-1980-35c-0770 
 Volume    35 
8Author    Requires cookie*
 Title    Investigations of Quaternary Pyridinium -Salts, V I 1 Reactions of Quaternated Pyridines w ith the Trichloromethylanion  
 Abstract    The method to generate the trichloromethylanion from chloroform and bariumliydroxide was used to prepare some substituted trichlorom ethyl-l,2-dihydropyridines and trichloro-azabicyclo[4,1,0]heptenes. 
  Reference    (Z. Naturforsch. 32b, 193—199 [1977]; eingegangen am 4. Oktober 1976) 
  Published    1977 
  Keywords    Pyridinium-Salts, Insertion Reaction, Azabicyclo[4, l, 0]heptene 
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 TEI-XML for    default:Reihe_B/32/ZNB-1977-32b-0193.pdf 
 Identifier    ZNB-1977-32b-0193 
 Volume    32 
9Author    M. Ariana Bogatian, Calin Deleanu, Gheorghe Mihai, TeodorSilviu BalabanRequires cookie*
 Title    Pyrylium Salts with Long Alkyl Substituents, II [1] 2,4-Dimethyl-6-undecylpyrylium Perchlorate and Derived Pyridinium Salts Center o f Organic Chemistry o f the Roumanian Academy Splaiul Independentei  
 Abstract    The crystalline title pyrylium salt was obtained by SnCl4 catalysed acylation o f mesityl oxide with lauroyl chloride followed by treatment with perchloric acid and column chromatography. This new pyrylium salt was converted in high yields into the corresponding pyridine and N -substituted pyridinium salts (N-m ethyl, N-phenyl, N-(4-«-butylphenyl), and N -dodecyl) whose proton (300 M Hz) and carbon-13 (75 M Hz) N M R spectra are presented. 
  Reference    Z. Naturforsch. 47b, 1011—1015 (1992); received September 25 1991/January 10 1992 
  Published    1992 
  Keywords    Pyrylium Salts, Pyridinium Salts, Synthetic Amphiphiles, N M R Spectra 
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 TEI-XML for    default:Reihe_B/47/ZNB-1992-47b-1011.pdf 
 Identifier    ZNB-1992-47b-1011 
 Volume    47