由预胺化的单体(2,5-,3,5-或2,4-二氯-N,N-二甲基苄胺)合成了一系列新型的阴离子导电芳族共聚物,并研究了其在碱性燃料电池应用中的性能。目标共聚物(QPE- bl-11a,-11b和-11c)是通过镍介导的Ullmann偶联聚合,然后进行季铵化和离子交换反应合成的。与涉及氯甲基化或溴化的常规方法不同,该方法提供具有明确化学结构的共聚物。共聚物的亲水组分由经高密度铵基改性的化学稳定的亚苯基主链组成。寡聚(亚芳基醚砜酮)用作疏水性嵌段。QPE- bl -11a通过溶液浇铸获得了坚韧且可弯曲的膜。所获得的具有最高离子交换容量值(IEC = 2.47 mequiv g –1)的膜在80°C的水中显示出高的氢氧离子导电性(130 mS cm –1)。QPE- bl-11a膜在1 M KOH水溶液中在60°C下显示1000 h时具有合理的碱稳定性。使用肼作为燃料,QPE- bl -11a作
由预胺化的单体(2,5-,3,5-或2,4-二氯-N,N-二甲基苄胺)合成了一系列新型的阴离子导电芳族共聚物,并研究了其在碱性燃料电池应用中的性能。目标共聚物(QPE- bl-11a,-11b和-11c)是通过镍介导的Ullmann偶联聚合,然后进行季铵化和离子交换反应合成的。与涉及氯甲基化或溴化的常规方法不同,该方法提供具有明确化学结构的共聚物。共聚物的亲水组分由经高密度铵基改性的化学稳定的亚苯基主链组成。寡聚(亚芳基醚砜酮)用作疏水性嵌段。QPE- bl -11a通过溶液浇铸获得了坚韧且可弯曲的膜。所获得的具有最高离子交换容量值(IEC = 2.47 mequiv g –1)的膜在80°C的水中显示出高的氢氧离子导电性(130 mS cm –1)。QPE- bl-11a膜在1 M KOH水溶液中在60°C下显示1000 h时具有合理的碱稳定性。使用肼作为燃料,QPE- bl -11a作
Photochemical Regioselective C(sp<sup>3</sup>)–H Amination of Amides Using <i>N</i>-Haloimides
作者:Lei Pan、Joseph Elmasry、Tomas Osccorima、Maria Victoria Cooke、Sébastien Laulhé
DOI:10.1021/acs.orglett.1c00831
日期:2021.5.7
A metal-free regioselective C(sp3)–H amination of amides using N-haloimides in the presence of lithium tert-butoxide and visible light is presented herein. This photoexcited approach is straightforward, and it aminates a wide variety of amides under mild conditions without the use of photocatalysts, external radical initiators, or oxidants. A halogen-bonded intermediate between the tert-butoxide base
Ionic Liquids for Separation of Olefin-Paraffin Mixtures
申请人:Dai Sheng
公开号:US20110015461A1
公开(公告)日:2011-01-20
The invention is directed to an ionic liquid comprising (i) a cationic portion containing a complex of a silver (I) ion and one or more neutral ligands selected from organoamides, organoamines, olefins, and organonitriles, and (ii) an anionic portion having the chemical formula
wherein m and n are independently 0 or an integer of 1 or above, and p is 0 or 1, provided that when p is 0, the group —N—SO
2
—(CF
2
)
n
CF
3
subtended by p is replaced with an oxide atom connected to the shown sulfur atom. The invention is also directed to a method for separating an olefin from an olefin-paraffin mixture by passing the mixture through a layer of the ionic liquid described above.
Ni/C-catalyzed aminocarbonylation of aryl halides using DMF as an amine source and o-chlorophenyl formate as a CO surrogate and promoter
作者:Vijay P. Mahajan、Yuvraj A. Kolekar、Bhalchandra M. Bhanage
DOI:10.1016/j.mcat.2024.114167
日期:2024.5
shows remarkable activity towards a wide range of arylhalides containing electron-donating and electron-withdrawing functional groups. This methodology represents the moisture-sensitive ligand-free, co-catalyst-free, and heterogeneous recyclable catalyst. The Ni/C catalyst was utilized for up to five consecutive runs. The fresh and recycled Ni/C catalysts were characterized using several techniques, including
IONIC LIQUIDS FOR SEPARATION OF OLEFIN-PARAFFIN MIXTURES
申请人:UT-Battelle, LLC
公开号:US20130338389A1
公开(公告)日:2013-12-19
The invention is directed to an ionic liquid comprising (i) a cationic portion containing a complex of a silver (I) ion and one or more neutral ligands selected from organoamides, organoamines, olefins, and organonitriles, and (ii) an anionic portion having the chemical formula
wherein m and n are independently 0 or an integer of 1 or above, and p is 0 or 1, provided that when p is 0, the group —N—SO
2
—(CF
2
)
n
CF
3
subtended by p is replaced with an oxide atom connected to the shown sulfur atom. The invention is also directed to a method for separating an olefin from an olefin-paraffin mixture by passing the mixture through a layer of the ionic liquid described above.