Oxydation sélective de thio‐1 et séléno‐1 chromènes. obtention de thio‐1 et séléno‐1 coumarines, de formyl‐2 benzo(b) thiophènes, de formyl‐2 benzo(b) sélénophènes et d'autres isomères

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Abstract
The thio‐1 and seleno‐1 coumarins are now obtained by cyclization of the appropriated cinnamic acids [1]. We find a second general method by the selective oxidation of thio‐1 and seleno‐1 chromens [2]. This reaction leads to several products but we find how to favour the formation of the wished compounds by the choice of the oxidant, of the solvent and of the temperature. We describe the ways giving good yields of thio‐1 coumarins, seleno‐1 coumarins, formyl‐2 benzo(b) thiophenes, formyl‐2 benzo(b) selenophenes and other substances.

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