[2+2] Photocycloaddition, cationic cyclocodimerization, and reductive ring enlargement were developed for the syntheses of [2.n]-, [3.n]-, and [4.n]naphthalenophanes, respectively, from α,ω-bis(vinylnaphthyl)alkanes as a single starting material. Using the exclusive syn selectivity of the former two methods, the room required for the intraannular naphthalene-ring rotation in the ring system is determined.
以α,ω-双(
乙烯基萘基)
烷烃为单一起始原料,开发了[2+2]光环加成法、阳离子环化法和还原扩环法,分别用于合成[2.n]-、[3.n]-和[4.n]-
萘烷。利用前两种方法独有的合成选择性,确定了环系统中环内
萘环旋转所需的空间。