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.
C. R. Harrison, J. F. W. McOmie, J. B. Searle, J. P. Smith, J. O. Jenkins and J. W. Smith, J. Chem. Soc. C, 1966, 1769 DOI: 10.1039/J39660001769
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