通过使用Pd催化的交叉偶联方案,可以实现具有三个1,8-蒽单元的大环的迭代合成(参见图片,R = C 6 H 13),其中无铜的Sonogashira反应是反应的关键。最终环化。光化学模型反应表明,大环化合物有可能发生光诱导的[4 + 4]环加成而没有不希望的副反应,这与创建2D聚合物的最终目标有关。
Chemistry of Anthracene–Acetylene Oligomers. II. Synthesis, Structure, and Properties of 1,8-Anthrylene–Ethynylene Cyclic Tetramers and Related Acyclic Oligomers
The title π-conjugated oligomers consisting of anthracene and acetylene units were synthesized to construct a new type of three-dimensional organic architecture. An acyclic chain was extended by th...
Chemistry of Anthracene–Acetylene Oligomers: Synthesis and Enantiomeric Resolution of a Chiral 1,8-Anthrylene–Ethynylene Cyclic Tetramer
作者:Shinji Toyota、Shinya Suzuki、Michio Goichi
DOI:10.1002/chem.200501111
日期:2006.3.8
new type of chiral pi-conjugated system, the title anthracene-acetyleneoligomer containing two octyl groups at position 10 of 1,2-alternating anthracene groups was synthesized. Each anthracene unit was connected by Sonogashira coupling, and the tetrameric precursor was cyclized by a cross-coupling reaction to form the desired C2-symmetric compound. Its enantiomers were resolved by chiral HPLC with a
The title cyclic compound with an intraannular ethyl group was synthesized by macrocyclization with the Eglinton coupling and its enantiomers were resolved by chiral HPLC. The high barrier to racemization is discussed in terms of the steric hindrance of the ethyl group with a rigid ring moiety based on the molecular structure optimized by DFT method.
Two types of 1,8-anthrylene cyclic trimers with acetylene and diacetylene linkers were synthesized by macrocyclization of the acyclic precursors with Eglinton coupling as examples of the smallest a...
Glaser‐like coupling of terminal alkynes by thermal activation is extensively used in on‐surface chemistry. Here we demonstrate an intramolecular version of this reaction performed by atom manipulation. We used voltage pulses from the tip to trigger a Glaser‐like coupling between terminal alkyne carbons within a custom‐synthesized precursor molecule adsorbed on bilayer NaCl on Cu(111). Different conformations