22105-12-0Relevant articles and documents
NOVEL USE OF SUBSTITUTED CHROMAN-6-OLS
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Paragraph 0174-0176, (2021/02/05)
The present invention is directed towards the use of substituted chroman-6-ols of formula (I) wherein R1 and R2 are independently from each other H or C1-11-alkyl or (CH2)n—OH with n being an integer
SYNTHESE DE DIHYDROXY PHENACYLIDENE TRIPHENYLPHOSPHORANES NOUVEAUX PRECURSEURS DE COMPOSES FLAVONOIDES : SYNTHESE D'HYDROXY-6 ET HYDROXY-7 CHROMONES.
Le Floc'H, Yves,Lefeuvre, Martine
, p. 2751 - 2752 (2007/10/02)
The synthesis of two new dihydroxy phenacylidene triphenylphosphoranes from 2,4-dibenzoyloxy and 2,5-dibenzoyloxy acetophenones is described.By acylation of the hydroxyl groups of these ylides, intramolecular olefination of the ester carbonyl group and hydrolysis of the second ester group, some 6-hydroxy and 7-hydroxy chromones are prepared with good yields.