Direct synthesis of anthracenes from o-tolualdehydes and aryl iodides through Pd(II)-Catalyzed sp C H arylation and electrophilic aromatic cyclization
作者:Hyojin Park、Kwangho Yoo、Byunghyuck Jung、Min Kim
DOI:10.1016/j.tet.2018.03.006
日期:2018.4
The first direct synthesis of substituted anthracenes from o-tolualdehydes and aryl iodides via a Pd(II)-catalyzed CH arylation using an alcohol-bearing transient directing group and subsequent AgOTf-assisted electrophilic aromatic cyclization is described. New transient directing groups consisting of amino acids and amino alcohols enhanced the reactivity, and the CH arylation was complete in 12 h
Aluminium-mediated selective synthesis of benzo[f]tetraphenes or benzo[g]chrysenes was achieved via aromatic C–F bond cleavage and regioselective C–C bond formation.
A Pd(II)-catalyzed cascade synthesis of diverse polycyclicaromatichydrocarbons via transient directing group strategy has been developed, involving the consecutive arylation, cyclization and aromatization. The efficiency and practicality were demonstrated by wide substrate range, concise synthetic pathway and mild reaction conditions. The subsequent transformations of the benz[a]anthracene core accessed
已经开发了一种通过Pd(II)催化的通过瞬态导向基团策略级联的多种多环芳烃,涉及连续的芳基化,环化和芳构化。广泛的底物范围,简明的合成途径和温和的反应条件证明了其效率和实用性。苯并[ a ]蒽核心的后续转化获得了天然的生物活性PAH分子。
Improved Solid-State Photomechanical Materials by Fluorine Substitution of 9-Anthracene Carboxylic Acid
作者:Lingyan Zhu、Fei Tong、Christopher Salinas、Muhanna K. Al-Muhanna、Fook S. Tham、David Kisailus、Rabih O. Al-Kaysi、Christopher J. Bardeen
DOI:10.1021/cm502866e
日期:2014.10.28
mechanical response in crystalline microneedles and ribbons. Both the photodimer dissociation rate and the mechanical recovery varied by more than an order of magnitude, with 4F-9AC exhibiting the most rapid recovery time, on the order of 30 s. Nanoindentation measurements show that this crystal has a slightly reduced elastic modulus and a significantly reduced hardness, making it less brittle than the 9AC