Biphenylenes: the synthesis of 1-nitro- and 1-amino-biphenylene
Abstract
Unambiguous syntheses of 1-nitrobiphenylene from biphenyl derivatives are described; in one of these a dinitrotetraphenylene was also obtained.
Reduction of the nitro-compound gave 1-aminobiphenylene, which was also obtained by direct synthesis with intermediates containing a protected amino-group.