One-electron oxidation of 9-methylanthracene and 9-[(trimethylsilyl)methyl]anthracene: reversal of radical-cation selectivity by the trimethylsilyl group
作者:Sarath R. Sirimanne、Zhaozhao Li、Donald R. VanderVeer、Laren M. Tolbert
DOI:10.1021/ja00005a047
日期:1991.2
Oxidation of 9-methylanthracene by pyridine/iodine proceeds mainly through nucleophilic attack on the intermediate anthracene radical cation rather than deprotonation. Replacement of a methyl proton by trimethylsilyl completely reverses the regiochemistry.
Expected and unexpected photoreactions of 9-(10-)substituted anthracene derivatives in cucurbit[<i>n</i>]uril hosts
作者:Xianchen Hu、Fengbo Liu、Xiongzhi Zhang、Zhiyong Zhao、Simin Liu
DOI:10.1039/d0sc00409j
日期:——
By arranging substrates in a “reaction ready” state through noncovalent interactions, supramolecular nanoreactors/catalysts show high selectivity and/or rate acceleration features. Herein, we report the host–guest complexation of 9-(10-)substituted anthracene derivatives (G1–G3) with cucurbit[n]uril (CB[n], n = 8, 10), and the photoreactions of these derivatives in the presence of CB[n] hosts. Both
通过非共价相互作用将底物排列为“反应就绪”状态,超分子纳米反应器/催化剂显示出高选择性和/或速率加速特性。在这里,我们报道9-(10-)取代的蒽衍生物(G1-G3)与葫芦[ n ] uril(CB [ n ],n = 8、10)的主体-客体络合,以及这些衍生物在光催化下的光反应。 CB [ n ]主机的存在。CB [10]和CB [8]对9,10-二取代衍生物G1的光反应均无明显影响。对于G2和G3,CB [10]可作为纳米反应器或催化剂(10%)用于两种化合物的光二聚化,具有高选择性和高收率。然而,尽管CB [8]与G2形成了1:2的络合物,但也与CB [10]观察到的一样,在光辐照CB [8]·2 G2的络合物后,定量获得了光解产物(9-蒽甲醇)。这种意外的光解作用通过合理的催化循环得以合理化,在该催化循环中,蒽充当光可去除的保护基团(PPG),而碳鎓离子中间体则被CB稳定化[8]。
Multilayer Films with Nanocontainers: Redox-Controlled Reversible Encapsulation of Guest Molecules
Stable multilayerfilms with cucurbit[8]uril have been fabricated on the basis of the alternating layer‐by‐layer assembly of a novel side‐chain pseudopolyrotaxane and a photoreactive polyanion. The as‐prepared multilayerfilms exhibit good properties as surface‐imprinted multilayers, because cucurbit[8]uril molecules that are locked inside the multilayers can act as nanocontainers with specific binding