See also:

• FLUORENE (a-diphenylene methane), C13H16

FLUORENE (a-diphenylene methane), C13H16  or .(See also:

• C6H4
• C6H4(CH213r)2

C6H4)2CH2, a See also:

• HYDROCARBON

hydrocarbon found in See also:

• COAL

coal-See also:

• TAR

tar . It is obtained from the higher boiling fractions, after separation of See also:

• NAPHTHALENE, C

naphthalene and See also:

• ANTHRACENE (from the Greek avOpa, coal)

anthracene, by fractional See also:

• DISTILLATION (from the Lat. distillare, more correctly destillare, to drop or trickle down)

distillation, the portion boiling between 290—340° C. being taken . The See also:

• FLUORENE (a-diphenylene methane), C13H16

fluorene is separated from this by placing it in a freezing mixture, and is then redistilled or crystallized from glacial acetic See also:

• ACID (from the Lat. root ac-, sharp; acere, to be sour)

acid, or purified by means of its picrate . It may be prepared by distilling diphenylene ketone over See also:

• ZINC

zinc dust, or by See also:

• HEATING

heating it with hydriodic acid and See also:

• PHOSPHORUS (Gr. 4ws, light, sPEpety, to bear)

phosphorus to 1 50—16o° C.; and also by passing the vapour of See also:

• DIPHENYL (phenyl benzene), C6H5

diphenyl methane through a red hot See also:

• TUBE (Lat. tuba)

tube . It crystallizes in colourless plates, possessing a See also:

• VIOLET

violet See also:

• FLUORESCENCE

fluorescence, melting at 112—113° and boiling at 293—295° C . By oxidation with chromic acid in glacial acetic acid See also:

• SOLUTION (from Lat. solvere, to loosen, dissolve)

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 See also:

• COMPOSITION
• COMPOSITION (Lat. compositio, from componere, to put together)

composition C13H22 .