On fusion with caustic potash it decomposes with formation of tetrahydroxy-benzophenone, which then breaks up into resorcin and hydroquinone.
Benzophenone oxime, CeHSC (:NOH)C 6 H 5, exists only in one modification which melts at 140° C.; whereas the unsymmetrical benzophenones each yield two oximes.
It is employed commercially in the production of colouring matters (see Benzophenone), and for various synthetic processes.
Distillation of its calcium salt gives benzophenone with small quantities of other substances, but if the calcium salt be mixed with calcium formate and the mixture distilled, benzaldehyde is produced.
BENZOPHENONE (DIPHENYL KETONE), C 6 H 5 CO.
Many derivatives are known, thus ortho-amino-benzophenone, melting at 106° C., can be obtained by reduction of the corresponding nitro compound; it condenses under the influence of heated lead monoxide to an acridine derivative and with acetone in presence of caustic soda it gives a quinoline.
Tetramethyl-diamido-benzophenone or Michler's ketone, CO[C6H4N (CH3)2]2, melting at 173°, is of technical importance, as by condensation with various substances it can be made to yield dye-stuffs.