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  • 1
    Electronic Resource
    Electronic Resource
    Asterane, XXII. Synthese eines doppelten Tetraasterans: Nonacyclo[10.8.0.02,11.04,9.04,19.06,17.07,16.09,14.014,19]eicosan (1991)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 124 (1991), S. 103-109 
    Details
    ISSN: 0009-2940
    Keywords: Asteranes ; Cage compounds ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Asteranes, XXII1).  -  Synthesis of a Double Tetraasterane: Nonacyclo[10.8.0.02,11.04,9.04,19.06,17.07,16.09,14.014,19]eicosane1,4,5,8-Tetrahydronaphthalene-2,3-dicarboxylic anhydride (9) is dimerized by UV light in dioxane yielding four isomeric [2 + 2] adducts whose methyl ester derivatives are elucidated spectroscopically. The structures of the major products 14 and 16 have been confirmed by X-ray structure analysis. Degradation of the carboxylic groups of 14 afforded the title compound 5.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19911240118
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  • 2
    Electronic Resource
    Electronic Resource
    Optische Aktivität und absolute Konfiguration von 1,4-Dihydroxytricyclo[6.4.0.04,9]dodecan-7,10-dion und -7-on (1991)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 124 (1991), S. 1581-1584 
    Details
    ISSN: 0009-2940
    Keywords: Circular dichroism ; Tricyclo[6.4.0.04,9]dodecane-7,10-dione and -7-one,1,4-dihydroxy- ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Optical Activity and Absolute Configuration of 1,4-Dihydroxytricyclo[6.4.0.04,9]dodecane-7,10-dione and -7-one(±)-1,4-Dihydroxytricyclo[6.4.0.04,9]dodecane-7,10-dione (1) has been resolved into the pure enantiomers through chromatographic separation of the diastereomeric dithioacetals 3A and 3B prepared with (-)-(2R,3R)-2,3-butanedithiol (2). The dithioacetals were converted into the acetals 4, from which the monoketones 6 were obtained by Raney nickel desulfurization/deprotection. The absolute configuration of (1R,4S,8S,9S)-(-)-6 is correlated with that of (1R,4S,8S,9S)-(-)- 1 by means of Cotton effects and its chromatographic behavior on potato starch. Some interaction between the carbonyl groups in the diketone 1 is demonstrated by comparison of UV, CD, and PE spectra with those of the monoketone 6.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19911240718
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  • 3
    Electronic Resource
    Electronic Resource
    Über die optische Drehung von Quaterphenyl-Derivaten (1991)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 124 (1991), S. 783-789 
    Details
    ISSN: 0009-2940
    Keywords: Polyphenyl derivatives, chiral ; Quaterphenyl derivatives ; Bimesityl derivatives ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Optical Rotation of Quaterphenyl DerivativesQuatermesityl (2) has been resolved by chromatography into pure enantiomers; (S)-(+)-2 shows [α]D=+ 108 as expected. (S)-(+)-3,3′-Diphenylbimesityl (9) has been prepared enantiospecifically and shows [α]D=+ 106. Chromatographic resolution of 9 as well as of quinquemesityl (15) succeeded, too. The optical activity of chiral polyphenyl derivatives is discussed. The interplanar angles of the quaterphenyl derivatives 2, 9, and 14 are presented.
    Additional Material: 5 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19911240419
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  • 4
    Electronic Resource
    Electronic Resource
    Synthese von Metallkomplexen mit Bis(phenalenyl)imin-Liganden (1990)
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1990 (1990), S. 1119-1124 
    Details
    ISSN: 0170-2041
    Keywords: Phenalenones, hydroxy- ; Bis(phenalenyl)imine ligands ; Acenaphthenequinones ; Roesleria hypogea, pigments of ; Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Synthesis of Metal Complexes with Bis(phenalenyl)imine LigandsSynthesis of model pigments and their metal chelates with Zn, Co, Ni, and Mn (26a-d) are described. The former are obtained from 2,4-dihydro-4,9-dihydroxy-1,2,4-phenalenethione (14b) by connecting two molecules in a ninhydrin-like reaction with nitrogen to the ligand 8. These models confirm the structure of the zinc complex 2 isolated from the ascomyces Roesleria hypogea. Isolation of the rearranged ester 18 proves this compound to be an intermediate in the mechanism of the degradation process of phenalenetriones 14 to acenaphthoquinones 16.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jlac.1990199001203
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