Various bromonitro derivatives of acenaphthene,
fluorene, and diphenyl have been prepared and the reactivities of the bromine atoms towards piperidine measured.
With the exception of those diphenyl derivatives in
which the bromo and nitro groups occupied positions in
different rings, the results are in accordance with
Fuson's vinylogy theory.
In some instances the results have been used to
shed light on the arrangement of double bonds in aromatic compounds.
A comparison has also been made of the reactivities
of the bromine atoms in the bromonitrobenzenes with those
of the bromonitrotoluenes, the results indicating that
the presence of another substituent in the ring modifies
the halogen activity to a various extent depending on the
position of the substituent.
An unsuccessful attempt to study the problem of the
structure of naphthalene by another method has also been