313484-93-4Relevant academic research and scientific papers
A succinct strategy for construction of nanoporous ionic organic networks from a pyrylium intermediate
Che, Siying,Yang, Zhenzhen,Popovs, Ilja,Luo, Huimin,Luo, Yali,Guo, Wei,Chen, Hao,Wang, Tao,Jie, Kecheng,Wang, Congmin,Dai, Sheng
, p. 13450 - 13453 (2019)
Hydroxyl group and pyridinium salt-bifunctionalized nanoporous ionic organic networks prepared via a simple two-step strategy under metal-and template-free conditions are presented. The structural features of the resultant polymer (e.g. high surface area,
Rigid Multidimensional Alkoxyamines: A Versatile Building Block Library
Matt, Yannick,Wessely, Isabelle,Gramespacher, Lisa,Tsotsalas, Manuel,Br?se, Stefan
supporting information, p. 239 - 245 (2020/12/17)
Since the discovery of the “living” free-radical polymerization, alkoxyamines were widely used in nitroxide-mediated polymerization (NMP). Most of the known alkoxyamines bear just one functionality with only a few exceptions bearing two or more alkoxyamine units. Herein, we present a library of novel multidimensional alkoxyamines based on commercially available, rigid, aromatic core structures. A versatile approach allows the introduction of different sidechains which have an impact on the steric hindrance and dissociation behavior of the alkoxyamines. The reaction to the alkoxyamines was optimized by implementing a mild and reliable procedure to give all target compounds in high yields. Utilization of biphenyl, p-terphenyl, 1,3,5-triphenylbenzene, tetraphenylethylene, and tetraphenyl-methane results in linear, trigonal, square planar, and tetrahedral shaped alkoxyamines. These building blocks are useful initiators for multifold NMP leading to star-shaped polymers or as a linker for the nitroxide exchange reaction (NER), to obtain dynamic frameworks with a tunable crosslinking degree and self-healing abilities.
Topotactic Synthesis of Phosphabenzene-Functionalized Porous Organic Polymers: Efficient Ligands in CO2 Conversion
Yang, Zhenzhen,Chen, Hao,Li, Bo,Guo, Wei,Jie, Kecheng,Sun, Yifan,Jiang, De-en,Popovs, Ilja,Dai, Sheng
supporting information, p. 13763 - 13767 (2019/08/21)
Progress toward the preparation of porous organic polymers (POPs) with task-specific functionalities has been exceedingly slow—especially where polymers containing low-oxidation phosphorus in the structure are concerned. A two-step topotactic pathway for the preparation of phosphabenzene-based POPs (Phos-POPs) under metal-free conditions is reported, without the use of unstable phosphorus-based monomers. The synthetic route allows additional functionalities to be introduced into the porous polymer framework with ease. As an example, partially fluorinated Phos-POPs (F-Phos-POPs) were obtained with a surface area of up to 591 m2 g?1. After coordination with Ru species, a Ru/F-Phos-POPs catalyst exhibited high catalytic efficiency in the formylation of amines (turnover frequency up to 204 h?1) using a CO2/H2 mixture, in comparison with the non-fluorinated analogue (43 h?1) and a Au/TiO2 heterogeneous catalysts reported previously (?1). This work describes a practical method for synthesis of porous organic phosphorus-based polymers with applications in transition-metal-based heterogeneous catalysis.
Convenient syntheses of tetraarylmethane starting materials
Zimmermann, Thomas J.,Mueller, Thomas J. J.
, p. 1157 - 1162 (2007/10/03)
Tetraphenylmethane (1) and several functionalized tetraphenylmethanes 4-7, all of them useful building blocks for the construction of tetraarylmethane frameworks, are readily synthesized by improved standard procedures in multigram quantities. The structure of compound 5 has been additionally corroborated by an X-ray structure analysis. The novel class of tetrakis(thiazolylphenyl)methanes 8 showing a significant blue emission upon UV-excitation can be prepared in good yield by Hantzsch synthesis starting from the tetra(α-bromoketone) derivative 4b.
Synthesis and electronic properties of tetrakis[4-(pyrimidyl)phenyl]methanes - A novel class of electronically active nanometer-sized scaffolds
Zimmermann, Thomas J.,Freundel, Oliver,Gompper, Rudolf,Mueller, Thomas J. J.
, p. 3305 - 3312 (2007/10/03)
Tetrakis[4-(arylpyrimidyl)phenyl]methanes 4 can be readily synthesized by using a highly convergent vinamidinium salt cyclocondensation strategy. The conjugated side-chains of these novel nanostructures display interesting cooperative electronic features such as intramolecular exciplex coupling and ECEC redox processes in the cathodic region.
