The selective cross McMurry couplings of diaryl or aryl ketones with various substituted ketones were achieved in 53−94% isolated yields. It is believed that the strong affinity of the substituents to the low-valent titanium surface plays an important role in regards to moderating selectivity. Through the introduction of such substituents followed by their removal post McMurry coupling, structurally
Aggregation-induced emission luminogens and tunable multicolor polymer networks modulated by dynamic covalent chemistry
作者:Shilong Qin、Hanxun Zou、Yu Hai、Lei You
DOI:10.1016/j.cclet.2021.11.001
日期:2022.6
Aggregation-inducedemission (AIE) based luminescent materials are generating intensive interest due to their unique fluorescence in the aggregation state. Herein we report a strategy of dynamic covalent chemistry (DCC) controlled AIE luminogens for the regulation of multicolor emission in reversible covalent polymer networks. Tetraphenylethene derived ring-chain tautomers were prepared, and the emission
In this paper chiralpolymer R-P could be synthesized by click polymerization reaction of (R)-3,3′-diethynyl-2,2′-bis(octyloxy)-1,1′-binaphthalene (R-M-1) and 1,2-bis(4-azidophenyl)-1,2-diphenylethene (M-2), and S-P was obtained by click polymerization reaction of (S)-3,3′-diethynyl-2,2′-bis(octyloxy)-1,1′-binaphthalene (S-M-1) and M-2, respectively. R-/S-P enantiomers can show strong aggregation-induced
本文通过(R)-3,3'-二乙炔基-2,2'-双(辛氧基)-1,1'-联萘(R -M-1)的点击聚合反应可以合成手性聚合物R -P。和1,2-双(4-叠氮基苯基)-1,2-二苯基乙烯(M-2),通过(S)-3,3'-二乙炔基-2,2'-的点击聚合反应获得S -P。双(辛氧基)-1,1'-联萘(S -M-1)和M-2。[R - / S - P对映异构体可在聚集体和流延自旋膜中显示出强聚集诱导的圆偏振发光(AICPL)发射信号,不对称因子(g lum)分别高达6.97×10 -3和1.45×10 -2。该SEM图像进一步证明的AICPL响应行为- [R - / S - P可以在水的分数的90%归因于在聚集状态下的超分子自组装纳米线螺旋的形成(˚F瓦特)。
Room Temperature One-Step Conversion from Elemental Sulfur to Functional Polythioureas through Catalyst-Free Multicomponent Polymerizations
作者:Tian Tian、Rongrong Hu、Ben Zhong Tang
DOI:10.1021/jacs.8b02886
日期:2018.5.16
utilization of sulfur is a global concern, considering the abundant and cheap source of sulfurfrom nature and petroleum industry, its limited consumption, and the safety/environmental problems caused during storage. The economic and efficient transformation of sulfur remains to be a great challenge for both academia and industry. Herein, a room temperature conversion fromsulfur to functional polythioureas