dibromoarenes) reacted with diphenols, catalyzed by CuI/Fe(acac)3 in the presence of K2CO3 in anhydrous DMSO at 110 °C for 7 days under nitrogen atmosphere, to afford macrocyclic aryl ethers effectively. To expand this methodology, a cyclic hepta(p-phenylene oxide) and cyclic deca(p-phenylene oxide) were synthesized in one pot. Some macrocyclic aryl ethers showed strong fluorescence in acetone at 25 °C.
在K 2 CO 3的存在下,在无水DMSO中,氮气氛下,CuI / Fe(acac)3催化二碘芳烃(或二溴芳烃)与二酚反应,在110°C的条件下,在氮气氛下,将其催化7天,从而有效地提供了大环芳基醚。为了扩展该方法,在一个罐中合成了环状七(对苯醚)和环状十(对苯醚)。一些大环芳基醚在25°C的丙酮中显示强荧光。
Polymorphic crystals of oxacalix[4]arene with 1,3-alternate conformations of <i>S</i>
<sub>4</sub> and <i>C</i>
<sub>2</sub> symmetry
Calix[4]arene and oxacalix[4]arene derivatives have eight possible conformations in the up and down directions of their four aromatic rings from the mean plane of a bridged central ring, the conformations of which determine the functionality of the host frameworks. Despite being a known compound for five decades, oxacalix[4]arene, C24H16O4, has not been characterized previously by crystallographic
杯[4]芳烃和氧杂aca [4]芳烃衍生物在四个芳环的上下方向上具有八个可能的构象,这些构象从桥连的中心环的平均平面开始,其构象决定了主体骨架的功能。草酸氧杂lix [4]芳烃,C 24 H 16 O 4,尽管已经有五十年的已知化合物,但以前尚未通过结晶学方法对其进行表征。它从己烷/ CH 2 Cl 2溶液中结晶出来,得到两个多晶型物,即具有S 4和C 2的扭曲的1,3-交替结构的棱柱形和块状晶体。对称。先前通过密度泛函理论(DFT)计算将其作为首选的稳定构象。