Eine neue Reaktion von 4-Hydroxycumarinen und Synthese von 4-Fluorcumarinen
- 1 January 1991
- journal article
- research article
- Published by Georg Thieme Verlag KG in Synthesis
- Vol. 1991 (11) , 937-938
- https://doi.org/10.1055/s-1991-26611
Abstract
A Novel Reaction of 4-Hydroxycoumarins and Synthesis of 4-Fluorocoumarins 6-Chlorohydroxycoumarins dimerise on reaction with sulfur(IV) fluoride to 6,8′-dichloro-2,2,4,4-tetrafluoro-4′-oxospiro[2H-1-benzopyran-3(4H), 2′(4′H)-[1]benzopyrano[3,4-d][1,3]oxathiazole]. The novel 4-Fluorocoumarins are obtained from the corresponding 4-Chlorocoumarins by an halogen-exchange reaction.Keywords
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