This paper focuses on the synthesis of a wide variety of di benzo spiro bis-crown compounds,
in good yields using di-phenols, mono tosylates of oligoethylene glycols and caesium carbonate
in acetonitrile.
Photocontrolled morphological conversion and chiral transfer of a snowflake-like supramolecular assembly based on azobenzene-bridged bis(dibenzo-24-crown-8) and a cholesterol derivative
作者:Hui-Juan Wang、Heng-Yi Zhang、Huang Wu、Xian-Yin Dai、Pei-Yu Li、Yu Liu
DOI:10.1039/c9cc01874c
日期:——
A snowflake-like supramolecular clockwise-helical assembly was fabricated via the host–guest interaction, while a snowflake-like supramolecular non-helical assembly can be obtained upon UV-irradiation.
The topological polyrotaxane was built from an ammonium salt as an axle component bearing one olefin and one bulky unit at the end of chain and the derivative of dibenzo-24-crown-8 (DB24C8) as a wheel component having one terminal olefin. In this system, two kinds of reactions work at the same time as a driving force of the polymer construction. One is the inclusion reaction between the ammonium salt part of axle and the wheel, another is metathesis reaction between olefins of the axle and olefins of the wheel.
Controlled Reversible Anchoring of η6-Arene/TsDPEN- Ruthenium(II) Complex onto Magnetic Nanoparticles: A New Strategy for Catalyst Separation and Recycling
作者:Lei Wu、Yan-Mei He、Qing-Hua Fan
DOI:10.1002/adsc.201100317
日期:2011.11
A newcatalystseparation and recycling protocol combining magneticnanoparticles and host-guest assembly was developed. The catalyst, (η6-arene)[N-(para-toluenesulfonyl)-1,2-diphenylethylenediamine]ruthenium trifluoromethanesulfonate [Ru(OTf)(TsDPEN)(η6-arene)] bearing a dialkylammonium salt tag, was easily separated from the reaction mixtures by magnet-assisted decantation, on basis of the formation
开发了一种新的催化剂分离和回收方案,该方案结合了磁性纳米颗粒和客体组装。的催化剂,(η 6 -arene)ñ - (对甲苯磺酰)-1,2-二苯基乙二胺]合钌三氟甲磺酸酯的[Ru(OTF)(TsDPEN)(η 6 -arene)]轴承二烷基铵盐标签,被容易地分离二苯并[24]冠-8修饰的Fe 3 O 4形成假轮烷配合物的基础上,通过磁辅助倾析法从反应混合物中分离得到纳米粒子。钌催化剂已经成功地重复使用了至少5次,同时保留了对映体选择性,但以2-甲基喹啉的不对称氢化中相对较低的催化活性为代价。