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  • Organic Chemistry  (9)
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  • 2000-2004
  • 1995-1999
  • 1975-1979  (9)
  • 1976  (9)
  • 1
    Electronic Resource
    Electronic Resource
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 318 (1976), S. 613-617 
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Reactions of 2,6-Diallyloxy-4-alkyl(aryl)-1,3,5-triazines with 1,3-DipolesThe preparation of the 2,6-diallyloxy-4-alkyl(aryl)-1,3,5-triazines 2a - d is described. With nitrile oxides and nitrile imines they yield cycloadducts of type 3a - h and 4a - g. respectively.
    Notes: Die Darstellung der 2,6-Diallyloxy-4-alkyl(aryl)-1,3,5-triazine 2a - d wird beschrieben. Mit Nitriloxiden und Nitriliminen ergeben sie Cycloaddukte des Typs 3a - h und 4a - g.
    Additional Material: 3 Tab.
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  • 2
    Electronic Resource
    Electronic Resource
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 59 (1976), S. 880-901 
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Several alkyl substituted oxiranyl radicals derived by hydrogen abstraction from oxiranes are observed in solution by ESR.-spectroscopy. The ESR.-spectra demonstrate that oxiranyl radicals have pyramidal configurations at the radical carbon atom and undergo inversion. Alkyl substituted oxiranyls rearrange by ring opening to α-keto alkyl radicals. The rates of inversion decrease and the rates of rearrangement increase with alkyl substitution. The activation parameters of these processes are given for several cases and are related to radical structure. Line broadening effects caused by inversion allow the determination of relative signs of γ-CH3-coupling constants.
    Additional Material: 14 Ill.
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  • 3
    Electronic Resource
    Electronic Resource
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 59 (1976), S. 1826-1831 
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: A 4a,4b-dihydrophenanthrene-type cyclic photoisomer, the C isomer, is the major primary photoproduct of bianthrone in protic and aprotic polar solvents, and undergoes solvent-dependent secondary reactions, including the formation of dihydrohelianthrone in protic solvents. The C isomer was shown to be formed through the singlet excited state while the B isomer is formed via the triplet manifold.
    Additional Material: 2 Ill.
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  • 4
    Electronic Resource
    Electronic Resource
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 59 (1976), S. 1953-1962 
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Synthesis of 1,3-Disubstituted Adamantanes.A series of new 1-substituted 3-bromoadamantanes has been prepared. An improved method for the formation of cyclopropanes from olefins with diazomethane and copper salts is described.
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  • 5
    ISSN: 0075-4617
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Naturally Occurring Terpene Derivatives, 611). - Synthesis of FuranoeremophilanesA versatile synthetic scheme for the synthesis of the numerous naturally occurring furanoeremophilanes is described. The diene adduct 30 can be used as starting material for the preparation of racemic ligularone (66), trans-furanoeremophil-9-one (76) and euryopsonol (SO), as well as for the synthesis of numerous transformation products obtained from natural compounds. Detailed investigation of the possibilities of transformations with different synthetic furanoeremophilanes has opened up new routes for the synthesis of further natural products. - The stereochemical aspects are discussed in detail on the basis of 1H-NMR- spectra. The observed regularities in most cases allow a definite decision concerning the respective configuration and usually also the conformation, which is of great importance regarding further reactions - especially with cis-decalin derivatives.
    Notes: Für die Synthese der zahlreichen natürlich vorkommenden Furanoeremophilane wird ein weitgehend variierbares Syntheseschema beschrieben. Ausgehend vom Dien-Addukt 30 gelingt die Darstellung von racemischem Ligularon (66). trans-Furanoerernophil-9-011 (76) und Euryopsonol (80) sowie die Synthese zahlreicher aus Naturstoffen erhaltener Umwandlungsprodukte. Eine eingehende Untersuchung der Umwandlungsmöglichkeiten von verschiedenen synthetischen Furanoeremophilanen eröffnet Wege für die Synthese weiterer Naturstoffe. - Die stereochemischen Verhältnisse werden anhand der 1H-NMR-Spektren eingehend diskutiert. Die gefundenen Gesetzmäßigkeiten erlauben in den meisten Fällen eine eindeutige Entscheidung über die jeweilige Konfiguration und meistens auch über die für weitere Reaktionen wichtige Frage nach der Konformation insbesondere bei cis-Dekalinderivaten.
    Additional Material: 2 Tab.
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  • 6
    ISSN: 0075-4617
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: The Chemistry of Tropane Derivatives, VIII.  -  Investigations on the Structures of the Two Isomeric N-Oxides of TropineTropine N-oxide isomers were prepared in 69.5% yield by a modified method giving the isomers in a ratio of 1 (A): 1.2 (B). Both isomers are derivatives of 3-hydroxytropane, as has been demonstrated by chemical reactions. The configuration of the isomers was established by IH-NMR spectroscopic investigations on the isomers of [2,2,4,4-D4]tropine N-oxide and by measurement of dipole moments. Tropine N-oxide A shows axial and the isomer B equatorial 0-atoms. Furthermore, X-ray structure analysis of the isomer B confirmed the configurations ascertained by chemical and physico-chemical methods.
    Notes: Mit einem modifizierten Verfahren gelingt die Darstellung der beiden Isomeren des Tropin-N-oxids mit einer Ausbeute von 69.5% im Verhältnis 1 (A): 1.2 (B). Chemische Umsetzungen beweisen, daß es sich bei den beiden Isomeren um 3-Hydroxytropan-Derivate handelt. Durch Dipolmomentmessungen an beiden kristallwasserfrei dargestellten Isomeren des Tropin-N-oxids und nach 1 H-NMR-spektroskopischen Untersuchungen an den Isomeren des [2,2,4,4-D4]Tropin-N-oxids konnte deren Konfiguration festgelegt werden: Danach besitzt Tropin-N-oxid A eine Konfiguration mit axialem 0-Atom, Tropin-N-oxid B mit äquatorialem 0-Atom. Eine eindeutige Absicherung der auf chemischem und physikalisch-chemischem Wege abgeleiteten Strukturen der isomeren Tropin-N-oxide erfolgte durch eine Einkristallröntgenstrukturanalyse des Tropin-N-oxids B.
    Additional Material: 3 Ill.
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  • 7
    Electronic Resource
    Electronic Resource
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 318 (1976), S. 350-352 
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 2 Tab.
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  • 8
    Electronic Resource
    Electronic Resource
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 318 (1976), S. 479-482 
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Preparation of Substituted 1,2,4-Oxadiazoles from N-Cyano CompoundsN-Cyano-S-alkyl-isothioureas react with nitrile oxides to give the 3-aryl(alkyl)-5-[1-aryl(alkyl)-2-alkyl-3-isothioureido]-1,2,4-oxadiazoles 1a-o. N1,N3-Disubstituted cyanoguanidines yield the 3-aryl(alkyl)-5-(1-aryl-3-alkyl-2-guanidino)-1,2,4-oxadiazoles 2a-c.
    Notes: N-Cyan-S-alkyl-isothioharnstoffe reagieren mit Nitriloxiden zu 3-Aryl(alkyl)-5-[1-aryl(alkyl)-2-alkyl-isothioureido-(3)]-1.2.4-oxadiazolen 1a-o; N1,N3-disubstituierte Cyanguanidine ergeben 3-Aryl(alkyl)-5-[1-aryl-3-alkyl-guanidino-(2)]-1.2.4-oxadiazole 2a-c.
    Additional Material: 3 Tab.
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  • 9
    Electronic Resource
    Electronic Resource
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 318 (1976), S. 701-701 
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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