Pyrex-filtered sunlight irradiation of solutions of 2-amino-1,4-naphthoquinone unexpectedly failed to produce cyclobutane dimers. Irradiation in acetic anhydride led to the formation of the trimeric 6-[3'-amino-2'-(1,4-naphthoquinonyl)]-dibenzo[b,h]carbazole-5,13:7,12-diquinone as well as 3,3'-diaraino-2,2'-bi-1,4-naphthoquinonyl and diben=zo[b,h]carbazole-5,13;7,12-diquinone. Similar treatment of
经耐热
玻璃过滤的
2-氨基-1,4-萘醌溶液的日光照射出乎意料地未能产生
环丁烷二聚体。
乙酸酐中的辐射也导致三聚体6- [3'-
氨基-2'-(
1,4-萘醌基)]-二苯并[b,h]
咔唑-5,13:7,12-二醌的形成为3,3'-diaraino-2,2'-bi-
1,4-萘醌基,diben = zo [b,h]
咔唑-5,13; 7,12-二醌。用类似的方法处理2-甲基=
氨基-
1,4-萘醌,得到6- [3'-甲基
氨基-2'-(1,4-
萘甲酰基=壬基)]-二苯并[b,h]
咔唑-5,13:7 ,12-二醌和6-甲基-二苯并= [b,h]
咔唑-5,13:7,12-二醌。