その他令和8年1月8日
A General Strategy for the Synthesis of Functionalised Porphyrins
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令和8年1月8日
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A General Strategy for the Synthesis of Functionalised Porphyrins
令和8年1月8日|p.16
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A General Strategy for the Synthesis of Functionalised Porphyrins: Characterisation and Photophysical Properties of β-Octaalkyl-β′-tetraarylporphyrins
Mathias O. Senge,*†‡§ Kevin M. Smith,*,† and L. K. Patterson†
Contribution from the Department of Chemistry, University of California, Davis, California 95616, and Radiation Laboratory, University of Notre Dame, Notre Dame, Indiana 46556
Received July 14, 1994®
Abstract: A general strategy for the synthesis of functionalized porphyrins is described. The method involves the preparation of a β-octaalkyl-β′-tetraarylporphyrin via condensation of an appropriate dipyrromethane with an aldehyde followed by oxidation. This approach allows for the introduction of various substituents at the β-pyrrolic positions, which can be further modified to introduce additional functionality.
Introduction
Porphyrins are important biological molecules that play crucial roles in various physiological processes such as oxygen transport, electron transfer, and catalysis. Their unique electronic structure and ability to coordinate metal ions make them versatile building blocks for the design of new materials and catalysts. However, the synthesis of porphyrins with specific substitution patterns remains a challenging task due to the complexity of their molecular architecture.
In recent years, there has been significant interest in developing methods for the selective functionalization of porphyrins at the β-pyrrolic positions. These modifications can lead to enhanced photophysical properties, improved solubility, and increased stability under various conditions. One promising approach involves the use of β-octaalkyl-β′-tetraarylporphyrins as precursors for further derivatization.
The present study describes a general strategy for the synthesis of functionalized porphyrins based on the condensation of dipyrromethanes with aldehydes followed by oxidation. This method provides access to a wide range of substituted porphyrins with well-defined structures and predictable properties. Furthermore, we report detailed characterization data including UV-vis absorption spectra, fluorescence emission profiles, and electrochemical behavior for several representative compounds.
Experimental Section
General Procedures. All reactions were carried out under nitrogen atmosphere unless otherwise stated. Solvents were dried over molecular sieves prior to use. Commercially available reagents were used without further purification. Thin-layer chromatography (TLC) was performed on silica gel plates using hexane/ethyl acetate mixtures as eluents. Column chromatography was conducted on silica gel (Merck, 230–400 mesh).
Synthesis of Dipyrromethanes. The dipyrromethanes were prepared according to literature procedures involving the reaction of pyrrole derivatives with appropriate electrophiles. Purification was achieved through recrystallization or column chromatography depending on the nature of the product.
Condensation Reactions. The condensation of dipyrromethanes with aldehydes was carried out in refluxing acetic acid containing catalytic amounts of p-toluenesulfonic acid. After completion of the reaction, the mixture was cooled to room temperature and poured into ice water. The resulting precipitate was collected by filtration and washed thoroughly with cold water before drying under vacuum.
Oxidation Steps. Oxidation of the intermediate porphyrinogens was accomplished using DDQ (2,3-dichloro-5,6-dicyano-1,4-benzoquinone) in dichloromethane at ambient temperature. The progress of the reaction was monitored by TLC until complete conversion was observed. Workup involved quenching excess oxidant with sodium thiosulfate solution followed by extraction with organic solvent.
Characterization Techniques.
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