Über vielgliedrige Ringsysteme. I. Die präparativ ergiebige Synthese der Polymethylenketone mit mehr als 6 Ringgliedern

Ziegler, K.; Eberle, Hans-Jürgen; Ohlinger, Helmut

doi:10.1002/jlac.19335040109

Cited by 154 publications

(48 citation statements)

References 15 publications

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“…[19] To generatet he radical cation 3 in the presence of minimal quantities of excess oxidant or startinge namine, we finally used the Ziegler-Ruggli high-dilution principle. [20] By slowly and simultaneously adding dropwise equimolar solutions of 1b and PIFAt oasuspension of sodium carbonate in dichloromethane, we were able to isolate two products from the reaction mixture. Running the reaction in this way kept the two reactants (1b and PIFA) in the micromolar concentration range, thus favouring intra vs intermolecular reactions.…”

Section: Resultsmentioning

confidence: 99%

Oxidative Coupling of an Enaminoporphyrin: C−C, N−N Linkages or Both?

et al. 2015

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International audienceA symmetrical bis-nickelporphyrin was prepared in very good yield by oxidative coupling of a nickel(II) enaminoporphyrin. This dimer was obtained by the intermolecular reaction of the starting enamine (acting as nucleophile) with the porphyrin radical cation (acting as electrophile) generated in situ. Alternatively, by using different reaction conditions, an N-N linked porphyrin dimer was obtained in moderate yield. The monomeric extended porphyrin leading to the N-N linked dimer was obtained by the intramolecular reaction of the same radical cation with the neighbouring meso-aryl group (acting as nucleophile)

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Section: Resultsmentioning

confidence: 99%

Oxidative Coupling of an Enaminoporphyrin: C−C, N−N Linkages or Both?

et al. 2015

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“…Of this, 5-8 % consisted of (2) and 92-95 % of (3). Proof that only (2) is a pre-catena compound was provided by cleavage of the nitrogen-phenyl bond by way of the o-quinone according to the pattern established by SchiZlr41.…”

Section: Synthesis Of a Catena Compound By The Semistatistical Principlementioning

confidence: 98%

“…Liittringhaus (2) and (3) as viscous oils that are separable chromatographically on silica gel but give identical IR and NMR spectra. Since these products also give identical mass spectra (the same molecular ion and similar fragments), they are stereomers or topological isomers [31, differing only in that the macrocycles of (2) are intraannularly, and of (3) extraannularly, combined by the N atom.…”

Section: Synthesis Of a Catena Compound By The Semistatistical Principlementioning

confidence: 99%

Synthesis of a Catena Compound by the Semistatistical Principle

Lüttringhaus

Isele

1967

Angew. Chem. Int. Ed. Engl.

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100 ml of pure CS2 at room temperature. The clear yellow solution, obtained by filtration from insoluble polymer, is acetone provides a further, mild method of specifically altering nucleic acids by photochemical methods. concentrated to 20 ml in a vacuum and then cooled at -3OOC for 12 h. The mother liquor is decanted from precipitated sulfur, and the latter is treated dropwise, with careful shaking, with sufficient pure CS2 (ca. 10 ml) to dissolve all the yellow s8 and leave behind only the characteristic four-cornered platelets of S12. After decantation of the solution, these platelets are washed with 1 ml of CS2 and the remaining suspension of crystals is finally dried on filter paper. In this way 20 mg of S12 ("yield" ca. 0.1 %) of Slz is isolated, having m.p. 140-142'C (146-148 "C after recrystallization from benzene).

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“…2. Massenspektrum yon N,N'-Tetramcthylen-dia~etamid (N,N'-Diacctylputrcscin) ( 2 ) (nach [8] Der Nachweis, daB bei der N,N'-Diacetylverbindung (2) C O C H 3 aus dem Molekul-Ion abgespalten wird, wurde durch Bestimmung der genauen Masse und durch Untersuchung der deuterierten Derivate D6-(2) und Dlo-(2) erbracht; der Reaktionsablauf geht aus Schema I hervor.…”

Section: Wechselwirkung Zwischen Stickstoffhaltigen Funktionellen Gruunclassified

Massenspektrometrische Wechselwirkung zwischen den funktionellen Gruppen mehrfach substituierter Alkane

Bosshardt

Hesse

1974

Angewandte Chemie

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Der massenspektrometrische Zerfall di-und polyfunktioneller Alkane ist hauptsachlich durch zwei prinzipiell verschiedene Reaktionen gekennzeichnet : Einerseits werden die Strukturen der Fragment-Ionen durch den gesonderten Abbau jeder einzelnen funktionellen Gruppe bestimmt; andererseits jedoch entsteht eine mehr oder weniger groBe Anzahl von Fragment-Ionen durch das Zusammenspiel beider oder mehrerer funktioneller Gruppen. Diese besondere Art der Fragmentierung steht heute im Mittelpunkt der massenspektrometrischen Forschung. Im vorliegenden Fortschrittsbericht werden die bisher erzielten Untersuchungsergebnisse zusammengefaRt.

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Über vielgliedrige Ringsysteme. I. Die präparativ ergiebige Synthese der Polymethylenketone mit mehr als 6 Ringgliedern

Cited by 154 publications

References 15 publications

Oxidative Coupling of an Enaminoporphyrin: C−C, N−N Linkages or Both?

Oxidative Coupling of an Enaminoporphyrin: C−C, N−N Linkages or Both?

Synthesis of a Catena Compound by the Semistatistical Principle

Massenspektrometrische Wechselwirkung zwischen den funktionellen Gruppen mehrfach substituierter Alkane

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