Structurally Diverse Dendritic Libraries: A Highly Efficient Functionalization Approach Using Click Chemistry
作者:Michael Malkoch、Kristin Schleicher、Eric Drockenmuller、Craig J. Hawker、Thomas P. Russell、Peng Wu、Valery V. Fokin
DOI:10.1021/ma047657f
日期:2005.5.1
resulting dendriticlibraries are structurally diverse, encompassing a variety of backbones/surface functional groups, and are prepared in almost quantitative yields under very mild conditions. The robust and simple nature of this procedure, combined with its applicability to many aspects of polymer synthesis and materials chemistry, demonstrates an evolving synergy between advanced organic chemistry and
Well‐defined starpolymers consisting of tri‐, tetra‐, or octa‐arms have been prepared via coupling‐onto strategy using photoinduced copper(I)‐catalyzed 1,3‐dipolar cycloadditionclick reaction. An azide end‐functionalized polystyrene and poly(methyl methacrylate), and an alkyne end‐functionalized poly(ε‐caprolactone) as the integrating arms of the starpolymers are prepared by the combination of controlled
A supramolecular brush polymer via the self-assembly of bridged tris(β-cyclodextrin) with a porphyrin derivative and its magnetic resonance imaging
作者:Mo Sun、Heng-Yi Zhang、Qian Zhao、Xin-Yue Hu、Li-Hua Wang、Bo-Wen Liu、Yu Liu
DOI:10.1039/c5tb01537e
日期:——
their disadvantages, and promote the imaging ability. However, once an imaging agent has been prepared, it is usually hard to adjust it according to the actual needs. Herein, we developed a supramolecular brush polymer (SBP) as a versatile imaging agent platform. The SBP platform (SBPP) is constructed by the intermolecular inclusion complexation of bridged tris(β-cyclodextrin) (1) with Mn(iii)-porphyrin-bearing
occurred in the synthesis of 12-arm star PB. The 4-miktoarm star copolymer of butadiene and styrene was also synthesized with high yield (95.1%), high arm Mn and narrow PDI (1.04) by one pot synthesis using click reaction between two different linear polymers (PS-N3 and PB-N3) and a 4-arm core. All the starpolymers were characterized by GPC-MALLS-Viscosity-DRI. These multiarm starpolymers exhibit morphologies
通过叠氮化物之间的点击化学反应,合成了两个系列的丁二烯和苯乙烯的3–12多臂星形聚合物(S-PB和S-PS),具有高的M n(≥20 kg mol -1)和狭窄的PDI(≤1.04)。末端的聚合物和多炔基有机分子。与先前的报告相比,偶联反应的收率更高(≥85%),并且单臂聚合物的臂数和分子量增加(是之前的4到5倍)。特别是,效率最高的96.1%发生在12臂星形PB的合成中。还以高收率(95.1%),高臂M n合成了丁二烯和苯乙烯的4-miktoarm星型共聚物。通过使用两种不同的线性聚合物(PS-N 3和PB-N 3)和4臂核之间的点击反应,通过一锅合成法将PDI(1.04)缩小。所有星形聚合物均通过GPC-MALLS-粘度-DRI表征。这些多臂星形聚合物表现出从无规卷曲到硬球的形态,具体取决于星形聚合物的臂数。星形PB和PS中,固有粘度随臂数的增加而出现最大值,其中PB-4arm和PS-6arm的值分别最高。
Olefin hydroformylation and kinetic studies using mono- and trinuclear N,O-chelate rhodium(I)-aryl ether precatalysts
作者:Shepherd Siangwata、Nicholas C.C. Breckwoldt、Neill J. Goosen、Gregory S. Smith
DOI:10.1016/j.apcata.2019.117179
日期:2019.9
in the rhodium-catalysed hydroformylation of the terminal olefin, 1-octene, and internal olefins, 7-tetradecene and 4-octene. The complexes generally show good catalytic activity in the hydroformylation of 1-octene at temperatures ranging from 75 °C to 95 °C and syngas pressures of 20 to 40 bar. The precatalysts have excellent stability and could be reused several times using organic solvent nanofiltration