Investigating Variation of the Pnicogen Nucleophilic Heteroatom on Ionic Liquid Solvent Effects in Bimolecular Nucleophilic Substitution Processes
作者:Karin S. Schaffarczyk McHale、Ronald S. Haines、Jason B. Harper
DOI:10.1002/cplu.201900188
日期:2019.5
expand and develop the current understanding of ionicliquid solvent effects on bimolecular nucleophilic substitution processes. It was found that when using arsenic-, antimony- and bismuth-based nucleophiles, rate constant enhancement was observed for all solvent compositions containing ionicliquids. This rate constant enhancement was driven by ionicliquid/transition state interactions, which contrasts
Highly Stereoselective Synthesis of Trisubstituted Vinylcyclopropane Derivatives via Arsonium Ylides
作者:Hong Jiang、Xianming Deng、Xiuli Sun、Yong Tang、Li-Xin Dai
DOI:10.1021/jo051782n
日期:2005.11.1
Alkylidene or arylidene malonates reacted with arsonium allylides to give trans-disubstituted cyclopropane-1,1-dicarboxylates with high stereoselectivity in high yields. The mechanism of the cyclopropanation reactions has also been investigated.
Terpolymers from Borane‐Initiated Copolymerization of Triphenyl Arsonium and Sulfoxonium Ylides: An Unexpected Light Emission
作者:De Wang、Nikos Hadjichristidis
DOI:10.1002/anie.201901094
日期:2019.5.6
copolymerization of ω‐methylallyl (C3 units, chain is growing by three carbon atoms at a time) and benzyltriphenylarsonium (C1 units, chain is growing by one carbon atom at a time) ylides, followed by polymerization of sulfoxonium methylide (C1 units). Other substituted arsonium ylides, such as prenyltriphenyl, propyltriphenyl and (4‐fluorobenzyl)triphenyl can also be used instead of benzyltriphenylarsonium
定义明确的聚[((苯基亚甲基-co-甲基丙烯)-b-亚甲基] [[(C1-co-C3)-b-C1]三元共聚物的首次合成是通过一锅硼烷引发的ω-的无规共聚实现的甲基烯丙基(C3单元,链一次增长三个碳原子)和苄基三苯基ar(C1单元,链一次增长一个碳原子)乙炔,然后聚合亚砜基次甲基(C1单元)。也可以使用其他取代的砷化铵,例如异戊烯基三苯基,丙基三苯基和(4-氟苄基)三苯基代替苄基三苯基ar。所获得的三元共聚物定义明确,具有可预测的分子量和低多分散性(M n,NMR = 1.83-9.68×10 3 g mol -1,Đ= 1.09–1.22)。在这些非共轭三元共聚物中发现了意外的发光现象,这已通过荧光和NMR光谱学证实。这种现象可以通过沿三元共聚物链的烯丙基单体单元双键的异构化(异构化诱导的发光)来解释。
Highly Stereoselective Synthesis of<i>trans</i>-1,2-Cyclopropane Derivatives from Semistabilized Arsonium Ylides by Phase-Transfer-Catalysis Reactions
Semistabilized arsonium ylides, generated in situ from the correspondingarsonium salts in the biphasic system of dichloromethane-50% aqueoussodium hydroxide, reacted smoothly with electron-deficient alkenesto afford TRANS-1,2-cyclopropane derivativeswith high stereoselectivity. The synthesis of TRANS-1,2-cyclopropanederivatives in the presence of sodium hexamethyl--disilazanide(1.0 M solution in THF)
在二氯甲烷-50% 氢氧化钠水溶液的双相体系中,由相应的砷盐原位生成的半稳定化的砷叶立德与缺电子烯烃顺利反应生成具有高立体选择性的 TRANS-1,2-环丙烷衍生物。还研究了在六甲基-二硅氮烷钠(1.0 M THF 溶液)存在下合成 TRANS-1,2-环丙烷衍生物。
Highly stereoselective synthesis of trans-4-trifluoromethylsulfonyl-2,3-dihydrofurans from arsonium ylides and (E)-α-trifluoromethylsulfonyl-α,β-unsaturated ketones
作者:Zhenqi Chen、Jiaping Zhang、Jie Chen、Hongmei Deng、Min Shao、Hui Zhang、Weiguo Cao
DOI:10.1016/j.tet.2010.05.097
日期:2010.8
The reactions of arsonium bromides with (E)-α-trifluoromethylsulfonyl-α,β-unsaturated ketones in the presence of Cs2CO3 or K2CO3 proceeded smoothly under refluxing condition in dichloromethane (DCM) to give the corresponding trifluoromethylated trans-2,3-dihydrofurans in good to excellent yields with high stereoselectivity.
在二氯甲烷(DCM)中,在回流条件下,在Cs 2 CO 3或K 2 CO 3存在下,溴化砷鎓与(E)-α-三氟甲基磺酰基-α,β-不饱和酮的反应平稳进行,得到相应的三氟甲基化反式- 2,3-二氢呋喃具有良好的收率和优异的立体选择性。