Synthesis from (b)(I; X= NO,), ie, from 2: 2'-di-(2'': 4”-dinil~ o~ henylamino) diphenyl, by the well-known Graebe-Ullmann method, failed, since reduction of 2: 2'-di-(5”-niiro-l”: 2”: 3”- benzkrinzoZyZ) di~ ke~ yZ (IT) gave unworkable products. In the course of the synthesis of 1:
