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  • Organic Chemistry  (3)
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  • 1
    Electronic Resource
    Electronic Resource
    X-Ray Molecular Structure of a Red Bilin Derivative from Chlorella protothecoides. 4th communication on chlorophyll catabolismPart 3: [1]. (1993)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 76 (1993), S. 2236-2238 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The molecular structure of a chlorophyll a catabolite isolated from the culture medium of bleached Chlorella protothecoides cells has been determined by X-ray diffraction; the crystal structure shows a distorted helical arrangement of the pyrrole rings and consists of symmetrical dimers located at a crystallographic diad, which are stabilized by six intermolecular H-bonds.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/hlca.19930760607
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Imidazole und 1-Imidazolamine aus α-Acylaminoketiminen und α-Acylaminohydrazonen (1978)
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1978 (1978), S. 1916-1927 
    Details
    ISSN: 0075-4617
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Imidazoles and 1-Imidazolamines from α-Acylamino Ketimines and α-Acylamino HydrazonesCyclization of α-acylamino ketimines or α-acylamino hydrazones 7 with PCI5, POCI3 or PPh3/C2CI6/NEt311) yields imidazoles 8, which carry an alkyl(aryl), dialkylamino, arylamino, phthalimido or phenylsulfonylamino substituent in position 1. The starting compounds 7 are easily derived from α-amino acids via α-acylamino ketones 6.
    Notes: Cyclisierung von α-Acylaminoketiminen oder α-Acylaminohydrazonen 7 mit PCI5, POCI3 oder PPh3/C2Cl6/NEt311) ergibt Imidazole 8, die in 1-Stellung einen Alkyl(Aryl)-, Dialkylamino-, Arylamino-, Phthalimido- oder Phenylsulfonylamino-Substituenten tragen. Die Ausgangsverbindungen 7 sind aus α-Aminosäuren über α-Acylaminoketone 6 leicht zugänglich.
    Additional Material: 3 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jlac.197819781206
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Synthesis of Chlorophyll a Labeled at C(32) from Pheophorbide a Methyl Ester (1994)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 77 (1994), S. 1046-1050 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: [32-14C]Chlorophyll a (10b) was synthesized from pheophorbide a methyl ester (5a) in a seven-step partial synthesis. The key intermediate pheophorbide d methyl ester (6) was obtained by ozonolysis of the vinyl group of 5a in 91% yield. Selective reduction of the CHO group of 6 gave the corresponding alcohol 7, and conversion of the latter to the phosphonium bromide 8 yielded after Wittig reaction with [14C]paraformaldehyde, [32-14C]pheophorbide a methyl ester (5b). The final transformation to the title compound was achieved by acid hydrolysis of 5b, esterification with natural phytol to [32-14C]pheophytin a (9b), and eventual insertion of a Mg2+ ion.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/hlca.19940770417
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    Paper (German National Licenses)
    Fulltext
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