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  • 1
    Electronic Resource
    Electronic Resource
    Unusual reorganization reactions of 3-azabicyclo[3.3.1]nonanes (1991)
    s.l. : American Chemical Society
    Journal of the American Chemical Society 113 (1991), S. 9411-9412 
    Details
    ISSN: 1520-5126
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ja00024a081
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  • 2
    Electronic Resource
    Electronic Resource
    Bacteriochlorophyll c S, a new bacteriochlorophyll from Chloroflexus aurantiacus (1978)
    Springer
    Archives of microbiology 118 (1978), S. 153-156 
    Details
    ISSN: 1432-072X
    Keywords: Bacteriochlorophyll c S ; Absorption spectra ; Mass spectra ; Structure ; Homologues ; Chloroflexus aurantiacus ; Stearylalcohol
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract From four strains of the gliding phototrophic bacterium Chloroflexus aurantiacus, the as yet un-known bacteriochlorophyll c S was isolated in addition to small amounts of the know bacteriochlorophyll a P. The new bacteriochlorophyll c S is the main photosynthetic pigment of these organisms under the growth conditions used. It is different from the known bacteriochlorophylls c, as could be shown unequivocally by chromatographic examinations. Evidence for the structure of the new bacteriochlorophyll c S was obtained from mass spectra. The u.v./vis.-spectra and the chromatographic behavior are in accord with the suggested structure. The result includes two particularly interesting aspects: 1. Unlike the bacteriochlorophylls c, d, and e of the Chlorobiaceae, bacteriochlorophyll c S of Chloroflexus is not a mixture of isomeric and homologous molecules; 2. the esterifying alcohol of the propionic acid side chain is neither farnesol nor another isoprenoid alcohol, but is the straight chain aliphatic (C-18) stearylalcohol.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00415723
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  • 3
    Electronic Resource
    Electronic Resource
    Novel Iminium Compounds from N-Alkylanilinium Perchlorates and Aldehydes and Their Unexpected (Domino Type) Reactions (1995)
    s.l. : American Chemical Society
    The @journal of organic chemistry 60 (1995), S. 2263-2266 
    Details
    ISSN: 1520-6904
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/jo00112a058
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  • 4
    Electronic Resource
    Electronic Resource
    Resolution of racemic 1-azaadamantane derivatives by pig liver esterase catalysis (1995)
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1995 (1995), S. 1901-1902 
    Details
    ISSN: 0947-3440
    Keywords: 1-Azaadamantanes ; Mannich bases ; Grob fragmentation ; Pig liver esterase ; Decarboxylation ; Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The first kinetic resolution of racemic 1-azaadamantane derivatives with PLE led to the enantiomers (-)-1 and (-)-2. An unexpected formation of 3 from 1 in aqueous solution was observed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jlac.1995199510267
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  • 5
    Electronic Resource
    Electronic Resource
    Substituierte 1-Azaadamantane (1985)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 118 (1985), S. 4073-4085 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Substituted 1-AzaadamantanesSubstituted 1-azaadamantanes of type 14 are facilely prepared from the six-membered rings 2. Functionalized derivatives 2 of cyclohexane are easily synthesized from α,β-unsaturated ketones and dimethyl malonate or by similar procedures. With hexamethylenetetramine as partner the azatricyclic products 14 are formed in one step from 2. The Mannich-type mechanism of the key reaction is discussed, and the 1H NMR data are analyzed.
    Notes: Substituierte 1-Azaadamantane vom Typ 14 können auf einem einfachen Syntheseweg ausgehend vom Sechsringsystem 2 hergestellt werden. Funktionalisierte Cyclohexane vom Typ 2 sind wiederum ausgehend von α,β-ungesättigten Ketonen und Dimethylmalonat leicht zugänglich. Mit Hexamethylentetramin als Partner werden die Adamantanderivate 14 in einem Reaktionsschritt aus 2 aufgebaut. Der Mannich-artige Mechanismus der Schlüsselreaktion zum Tricyclus -wird diskutiert, und die 1H-NMR-Daten der erhaltenen 1-Azaadamantane werden analysiert.
    Additional Material: 2 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19851181019
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  • 6
    Electronic Resource
    Electronic Resource
    Notiz über eine einfache und leistungsfähige Methode zur Trennung von Chlorophyllderivaten der a- und b-Reihe (1981)
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1981 (1981), S. 1519-1522 
    Details
    ISSN: 0170-2041
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Note on a Simple Method for the Separation of Chlorophyll Derivatives of the a- and b-SeriesAn efficient, fast, and inexpensive method for the separation of metal-free derivatives of chlorophyll a (1) and chlorophyll b (2) in gram quantities, exemplified by the phaeophorbide a (or b) methyl esters (3) or (4), is described. This method is based on the partition between aqueous formic acid and tetrachloromethane. 3 and 4 are valuable key intermediates for preparative and spectroscopic studies.
    Notes: Am Beispiel der Phäophorbid a/b-Methylester (3) bzw. (4) wird eine leistungsfähige, schnelle und preiswerte Trennmethode für metallfreie Derivate der Chlorophylle a (1) und b (2) im Gramm-Maßstab vorgestellt, die auf der Verteilung zwischen wäßriger Ameisensäure und Tetrachlorkohlenstoff beruht. 3 und 4 sind wertvolle Schlüsselbausteine für präparative und spektroskopische Arbeiten.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jlac.198119810826
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  • 7
    Electronic Resource
    Electronic Resource
    Derivate natürlicher Tetrapyrrole für die Photodynamische Therapie, 2 Modellreaktionen zur direkten C—C-Verknüpfung von PorphyrinenHerrn Professor Dr. H. F. Grützmacher zum 60. Geburtstag gewidmet. (1992)
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1992 (1992), S. 569-573 
    Details
    ISSN: 0170-2041
    Keywords: Photodynamic therapy (PDT) ; Porphyrins ; Hematoporphyrin derivative (HPD) ; Mannich bases ; Benzyl cations ; Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Natural Tetrapyrrol Derivatives for the Photodynamic Therapy, 2.  -  Model Reactions for Direct C-C Linkages of PorphyrinsUntil now, there is a lack of information about the structure of the active components in the diagnosis and photodynamic therapy of cancer with hematoporphyrin derivatives (HPD). We describe the formation of HPD in terms of benzyl cation chemistry. Selective formation of the C - C-linked model compounds 4, 5 by reaction of protoporphyrin dimethyl ester (2) with electron-rich aromatic compounds as well as of 9 - 12, 15-17, obtained by reaction of the porphyrin dimethyl esters 2, 6, 7, and 8, with carbon electrophiles (preformed Mannich salts), results from this concept.
    Additional Material: 3 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jlac.199219920199
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  • 8
    Electronic Resource
    Electronic Resource
    Stereokontrollierte Synthesen von Mannich-Basen und γ-Aminoalkoholen (1992)
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1992 (1992), S. 233-237 
    Details
    ISSN: 0170-2041
    Keywords: Mannich bases ; Enamines ; Iminium salts ; γ-Amino alcohols ; Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Stereocontrolled Syntheses of Mannich Bases and γ-Amino AlcoholsThe reaction of enantiomerically pure SMP enamines 2 with iminium tetrachloroaluminates 3 yields optically active Mannich bases 4. Diastereoselective reduction of 4 gives γ-amino alcohols 5 with the desired configuration.
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jlac.199219920142
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  • 9
    Electronic Resource
    Electronic Resource
    Bacteriochlorophyll f. - Partialsynthese und Eigenschaften einiger Derivate (1988)
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1988 (1988), S. 343-347 
    Details
    ISSN: 0170-2041
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Bacteriochlorophyll f. - Partial Synthesis and the Behaviour of Some DerivativesStarting with chlorophyll a/b mixture 5/6 from green plants, we describe the partial synthesis of the bacteriophaeophorbide f methyl ester 7. This is a derivative of bacteriochlorophyll f (4). We postulate the existence of 4 as a natural product, though it has not yet been isolated. Methods for the separation of the epimeric compounds 7 are described.
    Notes: Wir beschreiben die Partialsynthese des Bacteriophäophorbid-f-methylesters 7 ausgehend vom Chlorophyll-a/b-Gemisch 5/6 aus grünen Pflanzen. 7 ist ein Derivat des von uns postulierten, in der Natur jedoch noch nicht entdeckten Bacteriochlorophylls f (4). Verfahren zur Epimerentrennung von 7 werden beschrieben.
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jlac.198819880407
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  • 10
    Electronic Resource
    Electronic Resource
    Chromatographische Trennung und Charakterisierung der Bacteriomethylphäophorbide e (1978)
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1978 (1978), S. 585-594 
    Details
    ISSN: 0075-4617
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Chromatographic Separation and Characterization of the Bacteriomethylphaeophorbides eThe solution of a difficult separation problem concerning various methylphaeophorbides 4 from bacteriochlorophyll e (mixture 1) of Chlorobium phaeovibrioides by using adsorbents of small particle size and improved chromatographic techniques is demonstrated. The components of 4, obtained for the first time in pure form, are unambiguously characterized and their mass- and 1H-NMR spectra are discussed.
    Notes: Die Lösung eines schwierigen Trennproblems durch den Einsatz von Adsorbentien geringer Korngröße und verbesserter chromatographischer Techniken wird am Beispiel der Methylphäophorbide e 4 des Bacteriochlorophylls e (Gemisch 1) aus Chlorobium phaeovibrioides beschrieben. Die erstmals in reiner Form erhaltenen Komponenten von 4 werden eindeutig charakterisiert und ihre Massen- und 1H-NMR-Spektren diskutiert.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jlac.197819780409
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