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1Author    WolfdieterA. Schenk, Thom As SturRequires cookie*
 Title    Elektronenreiche Ruthenium-Thiolat-Komplexe, Synthese und Reaktionen mit Elektrophilen Electron-Rich Ruthenium Thiolate Complexes, Synthesis and Reactions with Electrophiles  
 Abstract    Ruthenium thiolates [cpRu(PR'3)2(SR)] (PR ' 3 = PPh3, 1/2 dppe, 1/2 dppm, R = Me, C H 2Ph) are obtained from the corresponding chlorides and N aSR. PPh3 is readily exchanged for CO to give the chiral complexes [cpRu(PPh3)(CO)(SR)]. Alkylation with methyl tosylate yields the cations [cpRu(dppe)(SM eR)]+ and [cpRu(PPh3)(CO)(SM eR)]+, which were isolated as their PF6-salts. The neutral carbonyls add dimethyi acetylenedicarboxylate giving five-membered metallocycles. 
  Reference    Z. Naturforsch. 45b, 1495—1498 (1990); eingegangen am 6. Juni 1990 
  Published    1990 
  Keywords    Ruthenium Complexes, Thiolate Complexes, Cycloaddition 
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 TEI-XML for    default:Reihe_B/45/ZNB-1990-45b-1495.pdf 
 Identifier    ZNB-1990-45b-1495 
 Volume    45 
2Author    Z. NaturforschRequires cookie*
 Title    Übergangsmetall-substituierte Diphosphene, XXIV [ 1 ]  
 Abstract    Cheletrope [1 +4]-Cycloaddition von Azodicarbonsäureestern und -amiden an das metallsubstituierte Diphosphen (i75-C5M e5)(CO)2F e -P = P -Mes* (Mes* = 2,4,6-*Bu3C6H 2). Struktur von (i/5-C5M e5)(CO)2F e -P (= P -M e s *)|N (C 0 2E t)N = C (0 E t)Ö | Transition M etal Substituted Diphosphenes, XXIV [1] Cheletropic [1+4] Cycloaddition of Azodicarboxylic Esters and Amides to the Metal Substituted Diphosphene (^5-C5Me5)(CO)2F e -P = P -M e s * (Mes* = 2,4,6/Bu3C6H 2). Structure o f (^5-C5M e5)(CO)2F e -P(= P -M es*)[N (C 0 2Et)N = C (0 E t)0 ]. L othar Weber*, Holger Bastian, Achim Müller [2] und H artm ut Bögge [2] The diphosphenyl complex (>75-C 5M e5XCO)2F e -P = P -M e s * (1) (M es* = 2,4,6rBu3C6H2) 
  Reference    Z. Naturforsch. 47b, 231—2 (1992); eingegangen am 9. Juli/26. September 1991 
  Published    1992 
  Keywords    Diphosphene, Cycloaddition, Azodicarboxylates, X-Ray 
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 TEI-XML for    default:Reihe_B/47/ZNB-1992-47b-0231.pdf 
 Identifier    ZNB-1992-47b-0231 
 Volume    47 
3Author    R.R M Brand, M. L. Hallenslebenf, H. K. Schenkel, E. D. SchmidRequires cookie*
 Title    Ramanintensitäten und Reaktivität von Phenylvinylethern und Phenylvinylsulfiden Raman Intensities and Reactivity of Phenyl Vinyl Ethers and Phenyl Vinyl Sulphides  
 Abstract    From a selection of alkyl substituted phenyl vinyl ethers and phenyl vinyl sulphides, respectively, the Raman intensities of the aromatic 8 a, b vibration and the C = C valence vibration were measured and compared to the reactivities in the cycloaddition reaction to tetracyanoethylene. 
  Reference    Z. Naturforsch. 33b, 197—199 (1978); eingegangen am 24. Oktober 1977 
  Published    1978 
  Keywords    Substituted Phenyl Vinyl Ethers, Cycloaddition, Tetracyanoethylene, Raman 
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 TEI-XML for    default:Reihe_B/33/ZNB-1978-33b-0197.pdf 
 Identifier    ZNB-1978-33b-0197 
 Volume    33 
4Author    Alfred Schmidpeter, Hubert KlehrRequires cookie*
 Title    Überführung von Triazaphospholen in Diazaphosphole durch Acetylenaddition/Nitrileliminierung [1] Conversion of Triazaphospholes into Diazaphospholes by Acetylene Addition/Nitrile Elimination [1]  
 Abstract    Acetylene di-and (less easily) monocarboxylic esters replace nitriles from the 4,5-position of 1,2,4,3-triazaphosphole rings to give carboxyl derivatives of 1,2,3-diaza-phospholes, presumably by a cycloaddition/cycloreversion mechanism. In cases with a mobile N-substituent alternatively the loss of N2 seemed feasible, but was normally not observed. 
  Reference    Z. Naturforsch. 38b, 1484—1487 (1983); eingegangen am 7. Juli 1983 
  Published    1983 
  Keywords    Dicoordinate Phosphorus, Azaphospholes, Cycloaddition, Cycloreversion, NMR Spectra 
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 TEI-XML for    default:Reihe_B/38/ZNB-1983-38b-1484.pdf 
 Identifier    ZNB-1983-38b-1484 
 Volume    38 
5Author    G. C. Papavassiliou, G.A M Ousdis, A. PapadimRequires cookie*
 Title    A lternative M ethod for the Preparation o f 4 ,5-E th ylen ed ith io-l,3-d ith iole-2- thione and R elated C om pounds  
 Abstract    The compounds 4,5-ethylenedithio-l,3-dithiole-2-thione, 4,5-(methyl) ethylenedithio-l,3-dithiole-2-thione and 4,5 (dimethyl) ethylenedithio-1,3-dithiole-2-thione were prepared by reaction of l,3-dithiole-2,4,5-trithione with ethylene, propyl­ ene and //w?s-2-butene, respectively. The prepara­ tive and spectroscopic data are identical with those obtained from the corresponding authentic samples. 
  Reference    Z. Naturforsch. 55b, 231 (2000); received D ecem ber 6 1999 
  Published    2000 
  Keywords    Cycloaddition, Thiones, jr-Donor M olecules, Organic Conductors 
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 TEI-XML for    default:Reihe_B/55/ZNB-2000-55b-0231_n.pdf 
 Identifier    ZNB-2000-55b-0231_n 
 Volume    55 
6Author    S.Requires cookie*
 Title    Strahlenchemische Cycloadditionen mit Äthylen und Acetylen (Produktbildung und Lösungsmittelwahl)  
 Abstract    R a d ia tio n Chemical C ycloaddition Reactions w ith Ethylene and Acetylene M a n f r e d J . M i r e a c h 1, M a r l i s F. M i r b a c h 1 u n d A l f o n s S a u The (2 + 2) cycloadditions of maleic acid anhydride (MSA) and 1,3-cyclohexadiene (CHD) to ethylene and acetylene were initiated with gamma-rays in different solvents. The four-membered ring products were formed with high selectivity and surprisingly high energy yields in solvents with triplett energies smaller than ethylene and acetylene but higher than MSA and CH D resp. In benzonitrile as a solvent MSA reacts with ethylene to give cyclobutane-l,2-dicarboxylic acid anhydride (1) (G = 0.04) and with acetylene to give cyclobut-3-ene-l,2-dicarboxylic acid anhydride (2) (G = 3.7). The cyclobutene derivative (2) is formed in >80% yield and the bicyclopropyl derivative (3), which is the main product in the photochemical reaction, with a yield of <20%. 1,3-Cyclohexadiene was also added to ethylene to give bicyclo(4,2,0)oct-2-ene (G = 0.4) and bicyclo(2,2,2)oct-2-ene (G = 0.1) under gamma irradiation in methylnaphthalene as a solvent. Under similar conditions addition to acetylene gave bicyclo(4,2,0)octa-2,7-diene (G = 0.04) and bicyclo(2,2,2)octa-2,5-diene (G = 0.3), respectively. 
  Reference    (Z. Naturforsch. 32b, 281—284 [1977]; eingegangen am 6. Oktober 1976) 
  Published    1977 
  Keywords    Cycloaddition, Ethylene, Acetylene, Maleic Acid Anhydride, 1, 3-Cyclohexadiene 
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 TEI-XML for    default:Reihe_B/32/ZNB-1977-32b-0281.pdf 
 Identifier    ZNB-1977-32b-0281 
 Volume    32 
7Author    G.Erhard Himbert, Dieter Faul, Michael BarzRequires cookie*
 Title    Cycloadditionen, XIX [1] Umsetzungen von Butadiinyl-und Hexatriinyl-amin-Derivaten mit Nitriloxiden Cycloadditions, XIX [1] Reactions of Butadiynyl-and Hexatriynyl-amine Derivatives with Nitrile Oxides  
 Abstract    Butadiyn-and hexatriynamines l a -g , bearing silyl-, trichlorvinyl-and amino groups, resp. in the co-position o f their acetylenic system add nitrile oxides 3 at their first C/C-triple bond to give the 5-am inoisoxazoles 4, whereas the analogous oligoynam ines 11—1, bearing a hydrogen in the co-position, add the nitrile oxides 3 at their terminal C/C-triple bond to give the 
  Reference    Z. Naturforsch. 46b, 955 (1991); eingegangen am 15. N ovem ber 1990 
  Published    1991 
  Keywords    Butadiynyl-, Hexatriynyl-amines, Isoxazoles, Cycloaddition, 1, 3-Addition, Cyclization 
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 TEI-XML for    default:Reihe_B/46/ZNB-1991-46b-0955.pdf 
 Identifier    ZNB-1991-46b-0955 
 Volume    46