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About the intermediacy of 1,2-dihydroquinazolinium salts in the Friedländer-Borsche synthesis of quinolinium salts in acidic medium |
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| Authors: | José Vicente María Teresa ChicoteAntonio Jesús Martínez-Martínez |
| Institution: | Grupo de Química Organometálica, Departamento de Química Inorgánica, Universidad de Murcia, Apartado 4021, 30071 Murcia, Spain |
| Abstract: | Spontaneously or under various heating conditions, 2-alkyl- or 2-aryl-(iminoalkyl)benzenamines react with ketones and triflic acid (1:1:1) to give quinolinium salts. When working under milder thermal conditions, intermediate 1,2-dihydroquinazolinium derivatives can be isolated or detected in solution but decompose upon standing or heating to give the corresponding quinolinium salts. |
| Keywords: | Quinolinium salts 1 2-Dihydroquinazolinium salts Friedlä nder-Borsche reaction Nitrogen heterocycles Ketones |
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