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1Author    Joseph Grobe, Due Le VanRequires cookie*
 Title    Reactive E=C (p-p)jr-Systems III [1]: Diels Alder Reactions with F 3 CP=CF 2 as Dienophile  
 Abstract    The perfluorophosphaalkene F 3 CP=CF 2 (1) reacts as a dienophile at temperatures between —20 and +15 °C with cyclopentadiene, 1,3-cyclohexadiene, butadiene and 2,3-dimethyl-butadiene, respectively, giving the corresponding Diels-Alder adducts 2 to 5 in high yields. The observed reactivity proves the close relationship of P=C and C=C systems. CF2 >F^ CF 2 
  Reference    Z. Naturforsch. 40b, 467—469 (1985); eingegangen am 27. November 1984 
  Published    1985 
  Keywords    Perfluorophosphaalkene, Diels-Alder Reactions, Mass Spectra, NMR Spectra 
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 TEI-XML for    default:Reihe_B/40/ZNB-1985-40b-0467.pdf 
 Identifier    ZNB-1985-40b-0467 
 Volume    40 
2Author    H. Parlar, R. Baumann, F. KörteRequires cookie*
 Title    Reaktionen von eis-Crotonsäurederivaten mit Cyclopentadien in heterogener Phase Reaction between cis-Crotonic Acid Derivatives and Cyclopentadiene in the Heterogeneous Phase  
 Abstract    Diels-Alder reactions between cyclopenta-diene and cis-crotonic acid derivatives were examined in the absorbed phase on various surfaces. The results indicate considerable differences under these conditions in the relative yields of exo and endo isomers. On silica gel, montigel, and aluminium oxide the reactions give mainly endo isomers. 
  Reference    Z. Naturforsch. 36b, 898—899 (1981); eingegangen am 30. April 1981 
  Published    1981 
  Keywords    Diels-Alder Reactions, Reactions on Surfaces, a, /?-Unsaturated Compounds 
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 TEI-XML for    default:Reihe_B/36/ZNB-1981-36b-0898_n.pdf 
 Identifier    ZNB-1981-36b-0898_n 
 Volume    36 
3Author    Andreas Ketter, R. Udolf, Herrmann, GarchingF R GRequires cookie*
 Title    Chiral Lewis Acids as Enantioselective Catalysts in the Diels-Alder Reaction and the Allylic Addition to Aldehydes  
 Abstract    The efficiency o f chiral Lewis acids derived from TiCl4 or A1(Bu/)2C1 with chiral chelating ligands as catalysts for som e enantioselective reactions was evaluated. The Diels-Alder reac­ tion between isoprene and methyl acrylate gave the cyclohexene derivative with up to 32% enantiomeric excess (e.e.). The reaction o f 3-methylbutanal with allyltrimethylsilane led to 6-m ethylhept-l-en-4-ol with up to 36% e.e. 
  Reference    Z. Naturforsch. 45b, 1684—4 (1990); received June 11 1990 
  Published    1990 
  Keywords    Chiral Lewis Acids, Allylic A ddition, Enantioselective Catalysis, Diels-Alder Reaction 
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 TEI-XML for    default:Reihe_B/45/ZNB-1990-45b-1684.pdf 
 Identifier    ZNB-1990-45b-1684 
 Volume    45 
4Author    Jörg Laue, G. Unther Seitz, H. Ans, W. AßmuthRequires cookie*
 Title    Synthese und [4+2  
 Abstract    ]-Cycloadditionen von 4a, 8a-Methanophthalazin, das erste Propellan mit einem elektronenreichen und einem elektronenarmen 47r-Diensystem Synthesis and [4+2] C ycloaddition Reactions o f 4a, 8a-M ethanophthalazine, the First Propellane w ith an E lectronrich and an Electrondeficient 47r-Diene System Cyclopropabenzene 3 reacts with 3,6-bis(trifluoro)-l,2,4,5-tetrazine 4 to afford in high yield the 4a,8a-methanophthalazine 6, the first propellane, containing an electron rich cyclohexadiene system on the one hand and an electron deficient diazadiene system on the other hand. According to the principle of Diels-Alder reactions with inverse electron demand, electron rich dienophiles like ketene acetals, enamines or dimethyl hydrazones react predominantly with the diazadiene system to yield the azo-bridged cycoadducts of type 19 and/or the tricyclic tetrahydropyridazines like 20. In the same fashion several more or less angle strained cycloalkenes cycloadd to the diazadiene of the propellane 6 to give the novel polycyclic azo compounds 34, 36, 38,40, 42 and 44 with exo-configuration of the annulated cycloalkanes. Attack apparently occurs from less hindered face anti to the methano bridge of 6 with high stereo-and site-selectivity. As anticipated the electron deficient dienophiles 1,2,4-triazoline-3,5-dione 45 and the benzoquinone 46 add with different site selectiviy to 6 furnishing the polycyclic pyridazines 47 and 48 resp. again by exclusive anti attack. Treatment of 6 with both an electron rich and an electron deficient dienophile like 49 and 45 resp. affords the heptacyclic anti-anti-bis adduct 51 with analogously high site-and stereoselectivity. 
  Reference    Z. Naturforsch. 51b, 348—358 (1996); eingegangen am 31. August 1995 
  Published    1996 
  Keywords    Diels-Alder Reactions, Valence Tautomerism, Propellane, Bivalent, 7r-Facial Selectivity, Site Selectivity 
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 TEI-XML for    default:Reihe_B/51/ZNB-1996-51b-0348.pdf 
 Identifier    ZNB-1996-51b-0348 
 Volume    51 
5Author    HildegardD. Inter, Rudolf Hänsel, Andrew PelterRequires cookie*
 Title    from Zingiber cassumunar (roxb.)  
  Reference    Z. Naturforsch. 35c, 156—158 (1980); received September 17 1979 
  Published    1980 
  Keywords    Zingiber cassumunar roxb, Alflabene and Cassumunene, 2-(3', 4'-dimethoxystyryl)-ethanol, Phenylbutene Derivatives, 13C NMR Spectra, Diels-Alder Reactions 
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 TEI-XML for    default:Reihe_C/35/ZNC-1980-35c-0156_n.pdf 
 Identifier    ZNC-1980-35c-0156_n 
 Volume    35