Xanthenyl and thioxanthenyl chlorides (1) were added to 1,1-bis-(p-alkoxyphenyl)-2-substituted-ethylenes (2) to give 1,1-bis-(p-alkoxyphenyl)-2-substituted-2-[xanthen(or thioxanthen)-9-yl]ethylenes (3). The 2-nitroderivatives (3) were converted in boiling methanolic potassium hydroxide into the allenes, 1,1-bis-(p-alkoxyphenyl)-2-[xanthen(or thioxanthen)-9-ylidene]ethylenes (4). The 2-methyl(or chloro)-derivatives (3) reacted with bromine in the presence of hydrogen bromide, to yield xanthylium or thioxanthylium tribromide (5) and the corresponding 2,2-disubstituted-ethylene (6). The tribromides (5) reacted with the ethylene (2, Z=H to give, after spontaneous dehydrobromination, the corresponding 2-bromo-derivatives (3, Z=Br).
向 1,1-双-(对烷氧基苯基)-2-取代-
乙烯(2)中加入呫吨苯基和
硫氧呫吨苯基
氯化物(1),得到 1,1-双-(对烷氧基苯基)-2-取代-2-[呫吨(或
硫氧呫吨)-9-基]
乙烯(3)。2-硝基衍
生物 (3) 在沸腾的
甲醇氢氧化钾中转化为 1,1-双-(对烷氧基苯基)-2-[
氧杂蒽(或
硫杂
蒽)-9-亚基]
乙烯 (4)。2-甲基(或
氯)-衍
生物 (3) 在
溴化氢存在下与
溴反应,生成黄原酸或
硫黄原酸三
溴化 物 (5) 和相应的 2,2-二取代-
乙烯 (6)。三
溴化物(5)与
乙烯(2,Z=H)反应,自发脱氢
溴化后,得到相应的 2-
溴衍
生物(3,Z=Br)。