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Xanthones 4,5-dinitro

Xanthone, 2,7-dibromo-dipole moment, 3, 627 (72M122205, 373CS196) Xanthone, 2,4-dinitro-dipole moment, 3, 627 (37JCS196)... [Pg.79]

Xanthone is unreactive towards hydrazine and phenylhydrazine. The oxime is obtained by reaction of xanthione (xanthene-9-thione) with hydroxylamine, or from xanthone and hydroxylamine in pyridine. When the oxime is heated in water with phenylhydrazine, the phenylhydrazone is formed. In acid solution, xanthone reacts normally with 2,4-dinitro-phenylhydrazine but xanthone-1 -carboxylic acid (435) gives the pyridazinone (436), possibly via the hydrazone (57JCS1922). When the oxime is heated with phosphorus pentachloride it undergoes a Beckmann rearrangement to give the amide (437) (70MI22300). [Pg.702]

CxaHaBr.JffaO, x-Tefcrabrom-x-dinitro-xanthon 171191, II381. [Pg.718]

See other pages where Xanthones 4,5-dinitro is mentioned: [Pg.79]    [Pg.79]    [Pg.79]    [Pg.79]    [Pg.718]    [Pg.2865]   
See also in sourсe #XX -- [ Pg.575 ]



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