Oxidative Addition of Alkenyl and Alkynyl Iodides to a Au
<sup>I</sup>
Complex
作者:Jamie A. Cadge、Hazel A. Sparkes、John F. Bower、Christopher A. Russell
DOI:10.1002/anie.202000473
日期:2020.4.16
intermolecular oxidative addition of alkenyl and alkynyl iodides to AuI are reported. Using a 5,5'-difluoro-2,2'-bipyridyl ligated complex, oxidative addition of geometrically defined alkenyl iodides occurs readily, reversibly and stereospecifically to give alkenyl-AuIII complexes. Conversely, reversible alkynyl iodide oxidative addition generates bimetallic complexes containing both AuIII and AuI centers. Stoichiometric
Catalytic Dehydrogenative Stannylation of C(sp)–H Bonds Involving Cooperative Sn–H Bond Activation of Hydrostannanes
作者:Francis Forster、Victoria M. Rendón López、Martin Oestreich
DOI:10.1021/jacs.7b13088
日期:2018.1.31
a stannylium-ion-like tin electrophile by heterolytic cleavage of the Sn-H bond in hydrostannanes at the Ru-S bond of Ohki-Tatsumi complexes is reported. Reacting these activated hydrostannanes with terminal acetylenes does not lead to hydrostannylation of the C-C triple bond but to dehydrogenative stannylation of the alkyne terminus. The scope of this rare direct C(sp)-H bond stannylation with hydrostannanes
Synthesis and characterization of fluorinated azadipyrromethene complexes as acceptors for organic photovoltaics
作者:Forrest S Etheridge、Roshan J Fernando、Sandra Pejić、Matthias Zeller、Geneviève Sauvé
DOI:10.3762/bjoc.12.182
日期:——
raised the oxidation potentials by 0.04 V to 0.10 V, and the reduction potentials by 0.01 V to 0.10 V, depending on the position and type of substitution. The largest change was observed for fluorine substitution at the proximalphenylgroups and CF3 substitution at the pyrrolic phenylacetylene moieties. The later complexes are expected to be stronger electron acceptors than Zn(WS3)2, and may enable
二(苯乙炔)氮杂二吡咯亚甲基的均配锌(II)络合物(例如Zn(WS3)2)是有机光伏发电的潜在非富勒烯电子受体。为了调整它们的性能,研究了 Zn(WS3)2 在不同位置的氟化。合成了三种基于氟化氮杂二吡咯亚甲基的配体,其中氟位于近端和远端苯基的对位以及吡咯苯乙炔部分。此外,在吡咯苯基位置添加了 CF3 部分,以研究该位置更强的吸电子单元的影响。将这四种配体与锌(II)和BF2+螯合,并研究了其光学和电化学性质。氟化对锌 (II) 和 BF2+ 配合物的光学性质影响不大,溶液中的 lambdamax 约为 755 nm 和 785 nm,摩尔吸光系数高达 100 x 103 M-1cm-1 和 50 x 103 M-1cm分别为-1。Zn(WS3)2 的氟化使氧化电位提高了 0.04 V 至 0.10 V,还原电位提高了 0.01 V 至 0.10 V,具体取决于取代的位置和类型。观察到最大
Stille Coupling Involving Bulky Groups Feasible with Gold Cocatalyst
作者:Juan delPozo、Desirée Carrasco、Mónica H. Pérez-Temprano、Max García-Melchor、Rosana Álvarez、Juan A. Casares、Pablo Espinet
DOI:10.1002/anie.201209262
日期:2013.2.18
Gold shuttle: Bulkygroups, which will not (or only very sluggishly) undergo Stillecoupling with stannanes and inexpensive ligands, can be efficiently coupled using bimetallic catalysis. A goldcocatalyst serves as an efficient shuttle to convey the bulkygroup from tin to palladium by reducing the steric crowding in the transition‐states (see scheme).