Hetera-<i>p</i>-carbophanes. IX. Effect of the Chain-Length of Alkoxyl Groups on the Barrier to Internal Rotation of Dialkoxybenzene Rings in Dialkoxydioxodioxa[<i>n</i>]paracyclophanes
作者:Kazuhiko Sakamoto、Michinori Oki
DOI:10.1246/bcsj.50.3388
日期:1977.12
Dioxodioxa[n]paracyclophanes which carry two methoxyl, ethoxyl, or propoxyl groups at the aromatic rings were prepared by condensation of α,ω-diols with corresponding 2,5-dialkoxy-1,4-phenylenediacetyl dichlorides under high dilution conditions. Dynamic 1H NMR spectra of these compounds show that barriers to internal rotation of the dialkoxybenzene rings are affected by the chain-length of the alkoxyl
在高稀释条件下,通过 α,ω-二醇与相应的 2,5-二烷氧基-1,4-苯二乙酰二氯缩合制备在芳环上带有两个甲氧基、乙氧基或丙氧基的二氧二氧杂 [n] 对环芳烃。这些化合物的动态 1 H NMR 谱表明,二烷氧基苯环内旋的障碍受烷氧基链长的影响;链长越长,屏障越高。