本文介绍了可能用于高能量密度锂离子电池的各种固体聚合物电解质的制备和锂离子电导率。在四丁基溴化铵(TBAB)存在下,由Zn(II),Cu(II)和Cd(II)配合物催化的环氧化物(M1 - M6)的开环聚合反应,生成聚醚(P1 - P6),其中磷酸盐作为侧基连接。Zn(II)催化剂的使用量略高于TBAB的反应条件显着提高了聚合速率,并在短时间内得到了较高摩尔质量的聚醚。这些聚合按照“单体活化的阴离子开环聚合”机理进行。这些类似聚合的反应也根据“每个引发剂的聚合物链的形成”模型而发展。使用双(三氟甲磺酰基)酰亚胺锂(LiTFSI)检查了这些聚合物的固态锂离子电导率。具有40 wt%的LiTFSI的一种固体聚合物电解质的电导率在室温下为5.2×10 -5 S cm -1,在室温下为2.9×10 -4 S cm -1 在80°C下。
probe this and to enlarge the very narrow catalytic scope of these Lewis bases, easily accessible mono- and bidentate phosphotriesters were tested as donors in two important transition metal-based catalytic transformations: the zinc-catalyzed hydrosilylation of ketones and the titanium-promoted diethylzinc addition to aldehydes. In both cases, the reactions were successful and the corresponding alcohols
Harvesting New Chiral Phosphotriesters by Phosphorylation of BINOL and Parent Bis-phenols
作者:G. Argouarch、C. Lalli、A. Ndimba、T. Roisnel
DOI:10.1055/s-0037-1611295
日期:2019.2
were synthesized selectively and in good yields. A systematic study on the phosphorylation of BINOL and other bis-phenols with chlorophosphates is described. An intriguing reactivity has been observed that is attributable to the hydroxyl group acidity and to the leaving group nucleofuge character within the phosphorylatingagentused. By playing on these two parameters, new chiral monophosphotriesters
New Bidentate Phosphorus Ligands Based on a Norbornane Backbone for Rhodium-Catalyzed Asymmetric Hydrogenation
作者:Wei Sun、Chungu Xia、Chonglin Cai、Fanguo Deng
DOI:10.1055/s-2007-992363
日期:2007.12
A new class of bidentate diphosphite and diphosphiniteligands has been developed from inexpensive norbornadiene. These ligands exhibited excellent enantioselectivities in the Rh(I)-catalyzed asymmetric hydrogenation of olefin derivatives (up to 99.9% ee).
New class of P-stereogenic chiral Brønsted acid catalysts derived from chiral phosphinamides
作者:Zhengxu S. Han、Hao Wu、Bo Qu、Yuwen Wang、Ling Wu、Li Zhang、Yibo Xu、Linglin Wu、Yongda Zhang、Heewon Lee、Frank Roschangar、Jeff J. Song、Chris H. Senanayake
DOI:10.1016/j.tetlet.2019.06.013
日期:2019.7
A new class of NH Brønsted acid organocatalysts that feature P-stereogenic chirality was developed. These catalysts were prepared from P-stereogenic chiral phosphinamides and show similar reactivity to BINOL derived phosphoric acid toward the reduction of quinolines via transfer hydrogenation. It shows that stereoselectivity is induced by the P-chiral environment that is created by the substituents