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(organic chemistry) An aromatic ketone, 9-oxo-xanthene, that is used as an insecticide.
Baeyer has suggested that the nine carbon atom system of xanthone may act as a chromophore.
An alternative view, due to Green, is that the oxygen atom of the xanthone ring is tetravalent, a supposition which permits the formulation of these substances as ortho-quinonoids.
When heated in air for many hours it decomposes, yielding carbon dioxide, phenol and xanthone.
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