The photocyclization-oxidation reaction of 1,6-di-p-substituted-phenyl-1,3,5-hexatrienes gave 3,9-disubstituted-chrysenes. Similarly, irradiation of 1-p-substituted-phenyl-6-phenyl-1,3,5-hexatrienes yielded 3-substituted-chrysenes. The 3-substituted-chrysenes were independently prepared in a high yield by the photocyclization-oxidation of 1-α-naphthyl-2-p-substituted-phenylethylenes.
1,6-二对位取代苯基-1,3,5-己三烯的光环化-氧化反应产生了3,9-二取代蒽。类似地,对1-对位取代苯基-6-苯基-1,3,5-己三烯的辐射处理产生了3-取代蒽。通过1-α-萘基-2-对位取代苯乙烯的光环化-氧化,高产率地独立制备了3-取代蒽。