Bismuth-Substituted “Sandwich” Type Polyoxometalate Catalyst for Activation of Peroxide: Umpolung of the Peroxo Intermediate and Change of Chemoselectivity
作者:Srinivasa Rao Amanchi、Alexander M. Khenkin、Yael Diskin-Posner、Ronny Neumann
DOI:10.1021/acscatal.5b00066
日期:2015.6.5
formation of a nucleophilic peroxo intermediate. There are two lines of evidence that support the formation of a reactive nucleophilic peroxo intermediate: (1) More electrophilic sulfoxides are more reactive than more nucleophilic sulfides, and (2) nonfunctionalized aliphatic alkenes and dienes showed ene type reactivity rather than epoxidation pointing toward “dark” formation of singletoxygen from the
W VI,Mo VI,V V和Ti IV化合物用过氧化物对烯烃进行环氧化是公认的方法,并且公认的是,活性中间过氧化物对亲核底物是亲电子的。Polyoxotungstates,例如,那些在“三明治”结构,[WZn(TM-L)的2(ZnW 9 ö 34)2 ] q - ,其中TM =过渡金属和L = H 2 O,在过去已经发现是出色的环氧化催化剂。现已发现,用刘易斯基本的Bi III代替进入“三明治”多金属氧酸盐结构的末端位置,生成[Zn 2 Bi III 2(ZnW 9 O 34)2 ] 14–导致明显的过氧化物种类的形成和亲核过氧化物中间体的形成。有两条证据支持反应性亲核过氧中间体的形成:(1)更多的亲电子亚砜比更多的亲核硫化物更具反应性;(2)未官能化的脂肪族烯烃和二烯显示出烯型反应性,而不是环氧化,指向“亲核中间体过氧物种形成单线态氧的“暗”形。烯丙醇的反应比烯烃快得多,但对醇的C–H
Anthracene Derivatives and Light-Emitting Devices Using the Anthracene Derivatives
申请人:Nomura Hiroko
公开号:US20090004506A1
公开(公告)日:2009-01-01
The present invention provides novel anthracene derivatives. In particular, the present invention provides light-emitting elements with high luminous efficiency, and light-emitting elements with long lifetime. Further, the present invention provides light-emitting devices and electronic devices having long lifetime by using these light-emitting elements. An anthracene derivative represented by the general formula (1) is provided. In addition, since the anthracene derivative represented by the general formula (1) has high luminous efficiency, a light-emitting element using the anthracene derivative represented by the general formula (1) can also have high luminous efficiency. By using the anthracene derivative represented by the general formula (1), light-emitting elements with long lifetime can be provided.
[EN] ? (PI)-CONJUGATED FLUOROIONOPHORES AND METHOD FOR DETERMINING AN ALKALI ION<br/>[FR] FLUOROIONOPHORES p-CONJUGUÉS ET MÉTHODE DE DOSAGE D'UN ION ALCALIN
申请人:UNIV POTSDAM
公开号:WO2012120141A1
公开(公告)日:2012-09-13
The present invention relates to π-conjugated fluoroionophores, methods for their preparation, and their use and a method for determining an alkali ion. Fluoroionophoric compounds of the general formula I are described Ionophore – π-Linker - Fluorophore (I) wherein the Ionophore is an anilino containing crown ether or cryptand with one or more anilino donor moieties as electron donors, forming a stable complex with an alkali metal ion the π-Linker is an aromatic or heteroaromatic conjugative linking moiety, and the Fluorophore is an electron acceptor moiety. Variation of the ionophoric unit offers a broad spectrum of detectable K+ and Na+ -concentrations, ranging from high concentration around 800 mM down to very low concentrations around 3 mM. The fluoroionophores have great potential for application in fluorescent optode system based blood analyzing equipment for methods and kits for the determination of K+ and Na+ concentrations in biological systems, either in vitro or in vivo, using embodiments of the disclosed fluoroionophores.
O-Neophyl-type 1,2-phenyl rearrangement initiated by electron transfer: development of kinetic probes of dissociative electron transfer
作者:Robert L. Donkers、Joseph Tse、Mark S. Workentin
DOI:10.1039/a807795i
日期:——
The first example of an O-neophyl-type rearrangement in a distonic radical anion was found in the electron transfer induced dissociative reduction of 9,10-diphenyl-9,10-epidioxyanthracene.