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1Author    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 
2Author    Wolf-H Gündel, Helmut BerenboldRequires cookie*
 Title    Pseudobasen aus Chinolinium-Salz und Alkoxiden Pseudobases from Quinolinium-Salts and Aleoxides  
 Abstract    The quaternary 3-cyano-quinolinium salt (lb) reacts in aqueous buffer solution (pH 7.5-12) to oxy-di(1.4-dihydroquinoline) (7), which gives on addition of alcohols or oximes in high yields the alcoxy-dihydroquinolines (8 a-c) or dihydroquinolyl-oximethers (8d-f). 
  Reference    Z. Naturforsch. 36b, 745—749 (1981); eingegangen am 4. März 1981 
  Published    1981 
  Keywords    Quinolinium Salts, Pseudobases, Insertion Reaction 
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 TEI-XML for    default:Reihe_B/36/ZNB-1981-36b-0745.pdf 
 Identifier    ZNB-1981-36b-0745 
 Volume    36 
3Author    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 
4Author    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 
5Author    Manfred Weidenbruch, Fateh SabetiRequires cookie*
 Title    Organosilylnitrite, -nitrate und verwandte Verbindungen Silicon Compounds with Strong Intramolecular Steric Interactions, V 1 Organosilicon Nitrites, Nitrates and Belated Compounds  
 Abstract    The reaction of triisopropyl-or tricyclohexylhalosilanes with silver salts gives the corresponding silyl nitrites and silyl nitrates. The insertion reaction of sulfur trioxide or dichlorocarbene into the silicon hydrogen bond of triisopropylsilane and tricyclohexyl-silane yields the sulfates and the dichloromethyl derivatives, respectively. 
  Reference    (Z. Naturforsch. 31b, 1212—1215 [1976]; eingegangen am 18. Juni 1976) 
  Published    1976 
  Keywords    Trialkylsilyl Nitrites, Trialkylsilyl Nitrates, Steric Hindrance, Insertion Reactions 
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 TEI-XML for    default:Reihe_B/31/ZNB-1976-31b-1212.pdf 
 Identifier    ZNB-1976-31b-1212 
 Volume    31 
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    Requires cookie*
 Title    Komplexchemie polyfunktioneller Liganden, XXXIV1 Direkte Synthese und Derivate von Co2(CO)6(R 2ECH2CH2ER2) (E — P, A s; R = C6H5)  
 Abstract    Complex Chemistry of Polyfunctional Ligands, X X X IV 1 Direct Synthesis and D erivatives of Co2(CO)6(R 2EC H 2CH 2E R 2) (E = P, As; R —C6H 5) J o c h e n E l l e r m a n n und N o r b e r t G e h e e b Octacarbonyldicobalt reacts with the ditertiary phosphine and arsine (C6H 5)2-ECH2CH2E(C6H 6)2 (E = P, As) in a direct route to give prim arily the non CO-bridged, but ligand-bridged complexes Co2(CO)6(C6H 5)2ECH2CH2E(C6H 5)2. From Co2(CO)6-(C6H 5)2PCH2CH2P(C6H 5)2 secondarily a CO-bridged isomer has been also isolated. The non-CO-bridged form of Co2(CO)6(C6H 5)2PCH2CH2P(C6H 5)2 gives insertion reactions with Hg, SnCl2 and CsGeCl3 yielding the probably oligo-or polymeric compounds Hg[Co(CO)3]2(C6H s)2PCH2CH2P(C6H 5)2 and Cl2M[Co(CO)3]2(C6H 5)2PCH2CH2P(C6H 8)2 (M = Sn, Ge). The characteristic IR absorptions of all compounds and some Raman spectra are reported. 
  Reference    (Z. Naturforsch. 30b, 566—574 [1975]; eingegangen am 20. Mai 1975) 
  Published    1975 
  Keywords    Cobaltcarbonyl Derivatives, Ditertiary Phosphines, Ditertiary Arsines, Insertion Reactions, Vibrational Spectra 
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 TEI-XML for    default:Reihe_B/30/ZNB-1975-30b-0566.pdf 
 Identifier    ZNB-1975-30b-0566 
 Volume    30 
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    JohnJ. Eisch, AndrzejM. Piotrowski, AllenA. Aradi, Carl Krüger, MariaJ. Romão, D. Ruhr, F.R GRequires cookie*
 Title    Die oxidative Addition von NickeI(0)-KompIexen an Kohlenstoff-Kohlenstoff-Bindungen im Cyclobutadien. Zur Frage der Überführbarkeit von CycIobutadien-Nickel(O)-Komplexen in Nickelaringe* Oxidative Addition of Nickel(O) Complexes to Carbon-Carbon Bonds in Cyclobutadiene. The Question of the Interconvertibility of Cyclobutadiene-nickel(O) Complexes and the Nickelaring Systems  
 Abstract    Bis(triethylphosphine)(?7 4 -tetraphenylcyclobutadiene)nickel (4) was synthesized by the reduc-tion of (?7 4 -tetraphenylcyclobutadiene)nickel(II)bromide (3) with r-butyllithium in the presence of Et 3 P, and its structure was determined by X-ray crystallography. Furthermore, its reactivity towards CO, CH 3 C0 2 H, PhC=CPh, LiAlH 4 and 0 2 were investigated. l,l-Bis(triethylphos-phine)-2,3,4,5-tetraphenylnickelole (14) was synthesized from (E,E)-1,4-dilithio-l,2,3,4-tetraphenyl-l,3-butadiene (15) and bis(triethylphosphine)nickel(II)bromide. Since the resulting crystals of the nickelole were not suitable for X-ray structure determination, the compound was characterized by elemental analyses, spectral data and carbonylation to yield tetraphenylcyclo-pentadienone (6). Analogous reductions of (?; 4 -tetraphenylcyclobutadiene)nickel(II)bromide (3) in the presence of Ph 3 P or Ph 2 PCH 2 CH 2 PPh 2 , followed by carbonylation, led to 6 in 40% yield, demonstrating that about half of the cyclobutadiene rings in 3 undergo cleavage upon reduction to give the nickelole. Reactions of the dilithium reagent 15 with NiBr 2 complexed with Me 2 PCH 2 CH 2 PMe 2 , Ph 3 P or Et 2 PCH 2 CH 2 PEt 2 , led to the formation of thermolabile nickeloles, as demonstrated by carbonyla-tion which yielded 6. Warming of the nickeloles and subsequent treatment with CH 3 C0 2 H led to the formation of l,2,3,4,5,6,7,8-octaphenyl-l,3,5,7-octatetraene (8) and, in one case, octaphenyl-cyclooctatetraene (5). The relevance of these findings to the mechanism of the Reppe nickel-catalyzed oligomeriza-tion of alkynes is discussed. 
  Reference    Z. Naturforsch. 40b, 624—635 (1985); eingegangen am 15. Januar 1985 
  Published    1985 
  Keywords    Insertion Reaction, Oxidative Addition, Cyclobutadiene-Nickel(O) Complexes, Nickelacyclopentadiene, Nickelole 
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 TEI-XML for    default:Reihe_B/40/ZNB-1985-40b-0624.pdf 
 Identifier    ZNB-1985-40b-0624 
 Volume    40 
10Author    Gabriele Hartmann, Rüdiger MewsRequires cookie*
 Title    Methoden zur Darstellung kationischer Rhenium-pentacarbonyl(thiazylhalogenid)-Komplexe Methods for the Preparation of Cationic Rhenium-pentacarbonyl(thiazylhalide) Complexes  
  Reference    Z. Naturforsch. 40b, 343—346 (1985); eingegangen am 15. August/16. November 1984 
  Published    1985 
  Keywords    (Thiazylhalide)rhenium-pentacarbonyl(+l), Metathesis, Reaction with Halides, Rhenium-pentacarbonyl-halides, Insertion Reactions 
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 TEI-XML for    default:Reihe_B/40/ZNB-1985-40b-0343.pdf 
 Identifier    ZNB-1985-40b-0343 
 Volume    40