Pyrolysis of Dimethoxy[<i>n</i>.2]Metacyclophanes: An Intramolecular Condensation Reaction to Give Oxa[<i>n</i>.2.1](1,3,2)Cyclophanes
作者:Jung-Hee Do、Yuta Yamada、Bigyan Sharma、Takehiko Yamato
DOI:10.3184/174751912x13296759770106
日期:2012.3
1](1,3,2)cyclophane in 35% yield arising from intramolecular condensation reaction of syn-8,16-dimethoxy[2.2]metacyclophane; similar results were also obtained in the pyrolysis of the higher anti- and syn-dimethoxy[3.2] metacyclophane to afford the corresponding 18-oxa[3.2.1](1,3,2)cyclophane. The mechanism of this novel intramolecular condensation reaction is discussed.
反 8,16-二甲氧基[2.2] 间环烷在 500°C 下热解得到 17-氧杂[2.2.1](1,3,2)环烷,产率 35%二甲氧基[2.2]间环芳烷;在较高的反和顺二甲氧基[3.2]元环烷的热解中也获得了类似的结果,以提供相应的18-氧杂[3.2.1](1,3,2)环烷。讨论了这种新型分子内缩合反应的机理。