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  • 1
    Electronic Resource
    Electronic Resource
    Mass Spectrometry of Aristolochic Acids (1983)
    s.l. : American Chemical Society
    Journal of natural products 46 (1983), S. 92-97 
    Details
    ISSN: 1520-6025
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/np50025a007
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  • 2
    Electronic Resource
    Electronic Resource
    In situ analysis of a new perylene quinone in lichens by Fourier-transform laser microprobe mass spectrometry with external sourceContribution from the 2nd European FTMS Workshop, Antwerp, Belgium, September 1993. (1994)
    New York, NY : Wiley-Blackwell
    Rapid Communications in Mass Spectrometry 8 (1994), S. 46-52 
    Details
    ISSN: 0951-4198
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Notes: The application of Fourier-transform laser microprobe mass spectrometry to lichens is described. The in situ detection of a new perylene quinone in samples of the tropical species Laurera sanguinaria Malme and Graphis haematites Fée was achieved with minimal specimen preparation. The high mass resolution and mass accuracy of the instrument eliminates the need for additional characterization of the isolated substances by high resolution electron impact mass spectrometry and direct introduction probe.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/rcm.1290080109
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  • 3
    Electronic Resource
    Electronic Resource
    Synthese von optisch aktiven β-substituierten Adamantanonen (1968)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 101 (1968), S. 2010-2027 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Ausgehend von optisch aktivem 2-Carboxy-adamantandion-(4.8) wurden alle vier β-substituierten Halogen-adamantandione und die acht möglichen β-substituierten Halogen-adamantanone durch Hunsdiecker-Reaktion bzw. Halogenaustausch dargestellt. Das entsprechende Azido-adamantandion und das „äquatoriale“ Azido-adamantanon konnten ebenfalls durch Substitutionsreaktionen erhalten werden. Für Vergleichszwecke wurden ferner das „äquatoriale“ Methyladamantanon und ein Adamantandion mit verlängerter Seitenkette dargestellt. Die IR- und NMR-Spektren dieser Verbindungen werden diskutiert.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19681010616
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  • 4
    Electronic Resource
    Electronic Resource
    Alkaloide aus Rhamnaceen, XXII. Amphibin-I, ein neues Alkaloid aus Ziziphus amphibia A. Cheval. (1974)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 107 (1974), S. 1329-1333 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Alkaloids from Rhamnaceae, XXII. Amphibine-I, a new Alkaloid from Ziziphus amphibia A. Cheval.Amphibine-1 (2) and the aporphine alkaloid (—)-Nuciferine (1) have been isolated from the crude alkaloid extract of Ziziphus amphibia A. Cheval., in which previously only cyclopeptide alkaloids had been found. the structure of 2 was elucidated by spectroscopic and degradative methods as 6,7- dimethoxy-2-methyl-1,2,3,4-tetrahydroisoquinoline with a peptide side chain at C-1.
    Notes: Aus dem Rohbasengemisch von Ziziphus amphibia A. Cheval., in dem bisher nur Cyclopeptidalkaloide gefunden wurden, konnte das Aporphinalkaloid (—)- Nuciferin (1) und Amphibin-1) (2) isoliert werden. 2 hat die Struktur eines 6,7-Dimethoxy- 2-methyl-1,2,3,4,-tetrahydroisochinolins mit einer Peptidseitenkette an C-1, wie durch chemischen Abbau und spektroskopische Methoden bewiesen werden konnte.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19741070429
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  • 5
    Electronic Resource
    Electronic Resource
    Die thermische Umlagerung von Tetraarylhydrazinen. Über die C-N-Verknüpfung bei der Bildung von Semidin-Derivaten (1974)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 107 (1974), S. 3624-3639 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: The Thermal Rearrangement of Tetraarylhydrazines. On the C-N-coupling Step in the Formation of Semidine DerivativesTetraarylhydrazines rearrange on heating to isomeric o- and (or) p-semidines. It was found, that these semidines are not formed form the intermediate diarylaminyl radicals via a radical substitution process.
    Notes: Es wurde nachgewiesen, daß die bei der Thermolyse von Tetraarylhydrazinen gebildeten isomeren o- und (oder) p-Semidine aus den intermediär auftretenden Diarylaminylen nicht durch homolytische aromatische Substitution entstehen.
    Additional Material: 5 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19741071116
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  • 6
    Electronic Resource
    Electronic Resource
    Alkaloide aus Rhamnaceen, XVIII. Amphiin-F, -G und -H, weitere Peptidalkaloide aus Ziziphus amphibia A. Cheval (1974)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 107 (1974), S. 686-697 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Alkaloids from Rhamnaceae, XVIII. Amphibine-F, -G and -H, further Peptide Alkaloids from Ziziphus amphibia A. Cheval.From the complex mixture of crude alkaloids from Ziziphus amphibia A. Cheval., in addition to the already described Amphibines-A, -B, -C, -D and -E, three further peptide alkaloids Amphibine-F, -G and -H have been isolated and their structures elucidated (1-3). Amphibine-F and -G (1, 2) belong to the class of cyclic peptide alkaloides having a fourteen-membered ring system made up from trans-3-hydroxyproline, p-hydroxystyrylamine and an α-aminoacid. Amphibine-H (3) has a thirteen-membered ring system formed from 5-hydroxy-2-methoxystyrylamine and the aminoacids trans-3-hydroxyproline and phenylalanine.
    Notes: Aus dem komplexen Rohbasengemisch von Ziziphus amphibia A. Cheval. wurden neben den bereits beschriebenen Amphibinen-A, -B, -C, -D und -E drei weitere Peptidalkaloide Amphibin-F, -G und -H isoliert und in der Struktur geklärt (1-3). Die Amphibine-F und -G (1, 2) zählen zu den Cyclopeptidalkaloiden mit 14 gliedrigem Ringsystem aus trans-3-Hydroxyprolin, p-Hydroxystyrylamin und einer α-Aminosäure. Das Amphibin-H (3) weist ein 13 gliedriges Ringsystem auf, das aus den Aminosäuren trans-3-Hydroxyprolin und Phenylatanin sowie aus 5-Hydroxy-2-methoxystyrylamin gebildet wird5).
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19741070241
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  • 7
    Electronic Resource
    Electronic Resource
    Alkaloide aus Rhamnaceen, XXVIII. Nummularin-G, -H und -K, weitere Peptidalkaloide aus Ziziphus nummularia (1977)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 110 (1977), S. 2649-2655 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Alkaloids from Rhamnaceae, XXVIII. Nummularin-G, -H and -K, New Alkaloids from Ziziphus nummulariaFrom Ziziphus nummularia in addition to the known alkaloids, nummularine-A, -B, -C, -D, -E, and -F, three further peptide alkaloids nummularine-G, -H, and -K have been isolated and their structures elucidated (1, 3, and 5). Nummularine-G and -K are fourteen-membered cyclopeptide ring systems. In 1 the nitrogen atom of the terminal amino acid is linked via a methylene group to the nitrogen atom of the hydroxyamino acid to form a five-membered ring. Nummularine-H (3) belongs to the thirteen-membered ring peptide alkaloids and has the structure of N-desmethyl-jubanine-A.
    Notes: Aus Ziziphus nummularia wurden neben den bereits beschriebenen Nummularinen-A, -B, -C, -D, -E und -F drei weitere Peptidalkaloide, Nummularin-G, -H und -K isoliert und deren Konstitution geklärt (1, 3 und 5). Die Nummularine-G und -K besitzen 14 gliedrige Cyclopeptidringe. Als Besonderheit weist 1 einen zusätzlichen Ring in der Seitenkette auf. Nummularin-H (3) gehört zu den 13 gliedrigen Cyclopeptidalkaloiden und besitzt die Konstitution eines N-Desmethyl-jubanins-A.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19771100722
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  • 8
    Electronic Resource
    Electronic Resource
    Alkaloide aus Rhamnaceen, XXV. Nummularin-A, -B und -C, drei neue 13gliedrige Peptidalkaloide aus Zizyphus nummulaira (1974)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 107 (1974), S. 3180-3185 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Alkaloids from Rhamnaceae, XXV Nummularine-A, -B and -C, Three New 13-Membered Ring Containing Peptide Alkaloids from Zizyphus NummulariaFrom the benzene extract of the root bark of Zizyphus nummularia, in addition to the known alkaloids Mucronin-D (1) and Amphibin-H (2), three further peptide alkaloids Nummularine-A, -B and -C have been isolated and their structures elucidated (3-5). All these alkaloids contain a thirteen-membered ring system formed by 5-hydroxy-2- methoxystyrylamine, trans-3-hydroxyproline and one other amine acid.
    Notes: Aus dem Benzolextrakt der Wurzelrinde von Zizyphus nummularia wurden neben den bekannten Alkaloiden Mucronin-D (1) und Amphibin-H (2) drei weitere Peptidalkaloide Nummularin-A, -B und -C isoliert und ihre Strukturen geklärt (3-5). Alle. genannten Alkaloide besitzen ein 13gliedriges Ringsystem, das aus 5-Hydroxy-2-methoxystyrylamin, trans-3-Hydroxyprolin und einer weiteren Aminosäure aufgebaut ist.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19741071004
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  • 9
    Electronic Resource
    Electronic Resource
    Untersuchungen zum Mechanismus der thermischen Umlagerung von Tetraarylhydrazinen. Die Thermolyse einiger deuterierter Tetraarylhydrazine (1975)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 108 (1975), S. 3550-3565 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: A Mechanistic Study of the Thermal Rearrangement of Tetraarylhydrazines. The Thermolysis of Some Deuterated TetraarylhydrazinesIn the thermolysis of the deuterated tetraphenylhydrazines 9 and 20-22 it was found that rearrangement to the semidines (e.g.4 and 5) proceeds intermolecularly. Tautomerization of the radical dimer intermediates (as 2 and 3) to semidines is faster than their dissociation into diarylaminyls.
    Notes: Die Thermolyse der deuterierten Tetraphenylhydrazine 9 und 20-22 zeigt, daß die Umlagerung zu den Semidinen wie 4 und 5 intermolekular verläuft, und daß die Radikaldimeren-Zwischenstufen vom Typ 2 und 3 rascher zu den Semidinen tautomerisieren als in Diarylaminyle zurückspalten.
    Additional Material: 3 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19751081117
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  • 10
    Electronic Resource
    Electronic Resource
    Oxidative Kupplung von N-Methyl-Säureamiden über Kupfer-Komplexe, I. Synthese eines Piperazins aus Dimethylformamid und Kupfer(I)-cyanid (1975)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 108 (1975), S. 991-996 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Oxidative Coupling of N-Methylcarboxamides via Copper Complex Forming, I. Synthesis of a Piperazine with Dimethylformamide and Cuprous CyanideDry dimethylformamide reacts with cuprous cyanide in the presence of acetyl chloride and aerial oxygen to give 1,4-dimethyl-2,2,3,3-piperazinetetracarbonitrile (1). In 1 the 4 nitrile groups in C-2 and C-3 react, each group with a vicinal one, with methanolic ammonia to yield 2′,5′-diiminopyrrolidine rings (2). The saponfication reaction of 1 with sodium ethoxide solution with formation of 3 is described.
    Notes: Wasserfreies Dimethylformamid reagiert mit Kupfer(I)-cyanid in Gegenwart von Acetylchlorid und Luftsauerstoff zum 1,4-Dimethyl-2,2,3,3-piperazintetracarbonitril (1). In 1 reagieren je 2 vicinale Nitrilgruppen an C-2 und C-3 mit methanolischem Ammoniak zu 2′,5′-Diiminopyrrolidiniringen (2). Die Verseifung von 1 mit Natriumäthylat zu 3 wird beschrieben.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19751080402
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