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  • 1
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1980 (1980), S. 1082-1107 
    ISSN: 0170-2041
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Chemistry of meso-Tetramethylporphine, II1)  -  Condensation Products of Carbonyl Compounds and Alcohols with Nickel(II)-meso-tetramethylporphineThe condensation products of nickel(II)-meso-tetramethylporphine (Ni-TMP, 1 a) with aldehydes or their acetals are described. In this simple way the diporphinylmethanes 2 a  -  d covalently linked at their β,β'-position have been obtained together with trimers and polymers (3 and 4). Reaction of 1 a with benzyl alcohol or diphenylmethanol produces the porphine derivatives 5 a and 5 b, which are analogs of diphenyl- and triphenylmethane, and the disubstituted derivatives 6 a and 6 b as by-products. Reaction of 1 a with lauraldehyde affords the polymer 7. In this way it is possible to synthesize porphine derivatives which are suitable for the construction of systems with monomolecular layers. The porphine derivatives, which are analogous to diphenyl- and triphenyl-methane are characterized by spectroscopy and their conformation in solution, which resembles the spatial structure of the porphyrine units in a bacteriochlorophyll a-protein complex is discussed.
    Notes: Es werden die Kondensationsprodukte von Nickel(II)-meso-tetramethylporphin (Ni-TMP, 1 a) mit Aldehyden oder deren Acetalen beschrieben. Auf einfache Weise werden so die β,β'-verknüpften Diporphinylmethanderivate 2a  -  d neben Tri- und Polymeren (3 und 4) erhalten. Die Umsetzung von 1 a mit Benzylalkohol und Diphenylmethanol führt zu den Diphenyl- und Triphenylmethan-analogen Porphinderivaten 5 a und 5 b. Als Nebenprodukte erhält man die disubstituierten Derivate 6 a und 6 b. Setzt man 1 a mit Laurinaldehyd um, so ergibt sich das Polymere 7. Diese Reaktion eröffnet den Weg zur Synthese von Porphinderivaten, die für den Aufbau von Systemen aus monomolekularen Schichten geeignet sein sollten. An Hand der Spektren wird die Konstitution der Diphenyl- und Triphenylmethan-analogen Porphine abgeleitet und deren Konformation in Lösung diskutiert, die der Anordnung der Porphyrineinheiten in einem Bacteriochlorophyll-a-Protein-Komplex ähnelt.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 0075-4617
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Chemistry of meso-Tetramethylporphine, I.  -  The Unusual Reactivity of Nickel(II)-meso-tetramethylporphine Derivatives and Their Conversion into Porphine PolymersThe radical side chain bromination of nickel(II)-meso-tetramethylporhine (Ni-TMP, 1a) with N-bromosuccinimide is reported and the porphine compounds obtained from 1a are described. The nickel(II)-meso-methoxymethyl derivative 3 forms the polymer 6 under acidic conditions. Reaction of 3 with 1a affords 4a in 70% yield; 4a is a model compound for the polymer 6. Reaction of 3 with 2,6-dimethylphenol produces the (phenyl)(porphinyl)- methane 7. These porphine derivatives 4a and 7, which are analogs of diphenylmethane, have been characterized by spectroscopy; their spatial structure is dicussed. Although the distance between the covalently linked porphine units in 4a is very small any interaction appears to be very slight.
    Notes: Es werden die radikalische Seitenkettenbromierung von Nickel(II)-meso-tetramethylporphin (Ni-TMP, 1a) mit N-Bromsuccinimid und die aus 1a erhaltenen Porphinderivate beschrieben. Das Nickel(II)-meso-methoxymethylderivat 3 bildet unter Einwirkung von Säuren das Polymer 6a. Die Umsetzung von 3 mit 1a führt in 70 proz. Ausbeute zur Modellsubstanz 4a für das Polymer 6. Die Umsetzung von 3 mit 2,6-Dimethylphenol ergibt das (Phenyl)(porphinyl)methan 7. An Hand der Spektren wird die Konstitution dieser dem Diphenylmethan analogen Porphinderivate 4a und 7 abgeleitet und deren sterischer Bau diskutiert. Trotz der sterischen Nähe beider kovalent gebundenen Porphinringe in 4a ist die gegenseitige Beeinflussung sehr gering.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
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