Six triple-layered [2.2]metaparacyclophanes have been prepared using general synthetic methods such as the Stevens rearrangement-Raney nickel desulfurization method, pyrolysis of bissulfone, and photo-induced desulfurization. The pyrolysis of bissulfone has turned out to be the most useful and convenient method for preparation of the intermediate double-layered [2.2]metaparacyclophanes because of simple experimental process and excellent yields. The unexpected formation of compound 9 during the photo-induced desulfurization of 7 was explained by a unique skeletal rearrangement of the intermediate 8 on irradiation.
已经使用一般合成方法制备了六种三层[2.2]元对苯环,方法包括斯蒂文重排-拉尼
镍脱
硫法、双亚磺酰的热解以及光诱导脱
硫。双亚磺酰的热解被证明是制备中间体双层[2.2]元对苯环最有用和方便的方法,因为其实验过程简单且产率优秀。在对化合物7进行光诱导脱
硫时,意外生成化合物9 的现象可以通过中间体8 在照射下的独特骨架重排来解释。