Diels-Alder reactions of pyrrolo[3,4-b]porphyrins |
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Authors: | Wei Liu |
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Affiliation: | Department of Chemistry, Louisiana State University, Baton Rouge, LA 70803, USA |
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Abstract: | In the presence of excess dimethylacetylene dicarboxylate (DMAD), nickel(II) pyrrolo[3,4-b]porphyrins undergo both Diels-Alder cycloaddition and Michael addition in toluene to give two bis-adducts, identified as compounds 4 and 5; the reaction can be accelerated by the addition of Lewis or Brønsted-Lowry acids. Refluxing the reaction mixture in 1,2,4-trichlorobenzene (220 °C) leads to a nickel(II) monobenzoporphyrin 2 as the main product. The structure of compound 4 was confirmed by X-ray crystallography. |
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Keywords: | Diels-Alder cycloadditions Pyrrolo[3,4-b]porphyrins Benzoporphyrins Mechanism Michael addition |
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