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2 -Acetoxy-a, 3-dibromochalcone

Other methods of preparing flavone include the action of ethanolic alkali on 2 -acetoxy-a,/3-dibromochalcone 7 Claisen condensation of ethyl o-ethoxybenzoate and acetophenone, and cyclization of the resulting 1,3-diketone with hydriodic acid 8 and treatment of 3-bromoflavanone with potassium hydroxide in ethanol.9 Flavone has also been prepared from ethyl phenyl-propiolate by condensation with sodium phenoxide and subsequent cyclization with phosphorus pentachloride in benzene 10 by fusing o-hydroxyacetophenone with benzoic anhydride and sodium benzoate 11 by the dehydrogenation of 2 -hydroxychal-cone with selenium dioxide 12 and by the action of alkali on flavylium chloride.13... [Pg.75]

Acetoxy-hydrogen sulfide, 31, 105 a-Acetyl-7-butyrolactone, 31, 74 Acetyl chloride, 30, 1 a-AcETYL-S-CHLORO-7-VALEROLACTONE,... [Pg.91]


See also in sourсe #XX -- [ Pg.32 , Pg.75 ]

See also in sourсe #XX -- [ Pg.32 , Pg.75 ]

See also in sourсe #XX -- [ Pg.32 , Pg.75 ]

See also in sourсe #XX -- [ Pg.32 , Pg.75 ]

See also in sourсe #XX -- [ Pg.32 , Pg.75 ]




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A-acetoxy

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