Action de O- et N-nucléophiles sur les sels de phényl-3 benzopyrylium-1 |
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Authors: | Colette Deschamps-Vallet,Jean-Baptiste Ilots ,Mich le Meyer-Dayan,Darius Molho |
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Affiliation: | Colette Deschamps-Vallet,Jean-Baptiste Ilotsé,Michèle Meyer-Dayan,Darius Molho |
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Abstract: | 3-Phenyl-1-benzopyrylium percholorates 1a, 1i react exculusively at C-2 with ethanol and isopropyl alcohol, affording mixed acetals 2a, 3a, 3i . Aqueous ammonia gives symmetrical secondary amines 4a, 4b or bis(3-phenyl-2H-1-benzopyran-2-yl)amines, while with aqueous aliphatic amines (40%) bis-acetals 5a, 5b or 2,2′-oxy-bis(3-phenyl-2H-1-benzopyrans) are characterized. In some other acidic conditions, 5a and 5b are also obtained. |
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