Online Encyclopedia

FLUORENE (a-diphenylene methane), C13H16

Online Encyclopedia
Originally appearing in Volume V10, Page 575 of the 1911 Encyclopedia Britannica.
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FLUORENE (a-diphenylene methane), C13H16  or .(C6H4)2CH2, a
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hydrocarbon found in
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coal-
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tar . It is obtained from the higher boiling fractions, after separation of naphthalene and anthracene, by fractional distillation, the portion boiling between 290—340° C. being taken . The fluorene is separated from this by placing it in a freezing mixture, and is then redistilled or crystallized from glacial acetic acid, or purified by means of its picrate . It may be prepared by distilling diphenylene ketone over
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zinc dust, or by
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heating it with hydriodic acid and phosphorus to 1 50—16o° C.; and also by passing the vapour of diphenyl methane through a red hot tube . It crystallizes in colourless plates, possessing a
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violet
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fluorescence, melting at 112—113° and boiling at 293—295° C . By oxidation with chromic acid in glacial acetic acid solution, it is converted into diphenylene ketone (CsH4)z•CO; whilst on heating with hydriodic acid and phosphorus to 250—260° C. it gives a hydro derivative of composition C13H22 .

End of Article: FLUORENE (a-diphenylene methane), C13H16
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