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Papers by Ahmad Hasan
Journal f�r Praktische Chemie/Chemiker-Zeitung, 1995
The thiazines lb-e, g, h react with isoamyl ni-triteMClg by nitrosation of the 3-methyl group to ... more The thiazines lb-e, g, h react with isoamyl ni-triteMClg by nitrosation of the 3-methyl group to the 3cyano-thiazines 3b+, g, h. As by-products the mesoionic pyridazinium salts 4b, e are formed. The compounds 4b-i and 4-le-i became main products by the nitrosation of lb-i with sodium nitrite/HCl. In this case as by-products the oximes 2b-d were isolated, which can be transferred with sodium nitrite into 4b-d. The regioselectivity of the nitrosation reaction of 1 is influenced by the substituents of the aryl group.
Journal f�r Praktische Chemie/Chemiker-Zeitung, 1995
The thiazines lb-e, g, h react with isoamyl ni-triteMClg by nitrosation of the 3-methyl group to ... more The thiazines lb-e, g, h react with isoamyl ni-triteMClg by nitrosation of the 3-methyl group to the 3cyano-thiazines 3b+, g, h. As by-products the mesoionic pyridazinium salts 4b, e are formed. The compounds 4b-i and 4-le-i became main products by the nitrosation of lb-i with sodium nitrite/HCl. In this case as by-products the oximes 2b-d were isolated, which can be transferred with sodium nitrite into 4b-d. The regioselectivity of the nitrosation reaction of 1 is influenced by the substituents of the aryl group.