Biphenylenes. Part XV. 3,7-Dimethyl- and 3,7-dimethoxy-1,5-dinitrobiphenylene
The compound produced by reaction of 3,4-dibromo-5-nitrotoluene with copper bronze has been shown to be 3,7-dimethyl-1,5-dinitrobiphenylene. The analogous 3,7-dimethoxybiphenylene has been prepared similarly from 3,4-dibromo-5-nitroanisole.
The dipole moment of the dimethyldinitrobiphenylene has been found to be about 2·4 D. This unexpected result is discussed.