Enantioselective Twofold C−H Annulation of Formamides and Alkynes without Built‐in Chelating Groups
作者:Hao Chen、Yin‐Xia Wang、Yu‐Xin Luan、Mengchun Ye
DOI:10.1002/anie.202001267
日期:2020.6.8
Twofold C−H annulation of readily available formamides and alkynes without built‐in chelatinggroups was achieved. Ni−Al bimetallic catalysis enabled by a bulky BINOL‐derived chiral secondary phosphine oxide (SPO) ligand proved to be critical for high reactivity and high selectivity. This reaction uses readily available formamides as starting materials and provides a concise synthetic pathway to a
Aqueous polymerization of styrene in biphasic media (styrene/water) has been achieved by water-soluble robust mononuclear hydride complexes [(η6-C6Me6)RuII(bpy)H]n(X) [1]n(X), where X = SO4 (n = 2) or CF3SO3 (n = 1), bpy = 2,2‘-bipyridine}. The hydride complex [1]2(SO4) was synthesized from the reaction of an aqua complex [(η6-C6Me6)RuII(bpy)(H2O)](SO4) 2(SO4)} with a water-soluble hydrogen donor
在两相介质(苯乙烯/水)苯乙烯的水性聚合已经由水溶性健壮单核氢化物络合物实现[(η 6 -C 6我6)的Ru II(BPY)H] Ñ(X)[ 1 ] Ñ( X),其中X = SO 4(n = 2)或CF 3 SO 3(n = 1),bpy = 2,2'-联吡啶}。氢化物配合物[ 1 ] 2(SO 4)是从一个水性络合物[(η的反应合成6 -C 6我6)的Ru II(BPY)(H2 O)](SO 4) 2(SO 4)}与H 2 O中的水溶性氢供体HCOONa在70-100°C的pH范围为4-12之间。通过X射线分析,1 H和2 H NMR,IR和电喷雾电离质谱(ESI-MS)确定[ 1 ] 2(SO 4)和1(CF 3 SO 3)的结构。X射线分析显示,复杂1(CF 3 SO 3)采用扭曲的八面体与钌原子几何由一个η协调6 -C 6我6个配体,1个双齿bpy配体和1个占据键位置的末端氢配体。络合物[
Photoinduced Hydrocarboxylation via Thiol-Catalyzed Delivery of Formate Across Activated Alkenes
作者:Sara N. Alektiar、Zachary K. Wickens
DOI:10.1021/jacs.1c07562
日期:2021.8.25
Herein we disclose a new photochemical process to prepare carboxylic acids from formate salts and alkenes. This redox-neutral hydrocarboxylation proceeds in highyields across diverse functionalized alkene substrates with excellent regioselectivity. This operationally simple procedure can be readily scaled in batch at low photocatalyst loading (0.01% photocatalyst). Furthermore, this new reaction can
Deprotonation of a formato ligand by a <i>cis</i>-coordinated carbyne ligand within a bis(phenolate) tungsten complex
作者:Tobias Schindler、Albert Paparo、Haruka Nishiyama、Thomas P. Spaniol、Hayato Tsurugi、Kazushi Mashima、Jun Okuda
DOI:10.1039/c8dt03056a
日期:——
Deprotonation of a formato ligand by a cis-coordinated propylidyne ligand in a tungsten(VI) complex [(OSSO)W(CEt)(OCHO)] (3) that contains a tetradentate bis(phenolato) ligand (OSSO = 1,4-dithiabutanediyl-2,2′-bis(4,6-di-tert-butyl-phenolato)}) gave the dioxo complex [(OSSO)WO2] (4) along with CO, ethylene and propylene as major products of decomposition.
and PtIIRhIII ([6c]NO3) complexes, the hydrides were extremely unstable and were likely to undergo an unusual metal-to-Cp* ring hydrogen transfer, resulting in η4-C5Me5H MIIRhI complexes, [M(μ-meppp)Rh(η4-C5Me5H)]NO3 (M = Pd ([7b]NO3), Pt ([7c]NO3)). The property of the hydride was drastically switched by varying the anchoring metal ions of the M′ site (Rh, Ir); that of [6a]NO3 (M′ = Rh) is not protic
具有P 2 S 2配体[M(meppp)](M = Ni(1a),Pd(1b),Pt(1c); H 2 meppp =中观-1,3-双[(巯基乙基)苯基膦基]丙烷),用[* M'Cp氯处理2 ] 2或[M'Cp *(NO 3)2 ](CP * =η 5 -五甲基),得到一系列bisthiolate桥连中号II M' III异核复合物,[M(μ-meppp)M'Cp * X] X'(M = Ni,Pd,Pt; M'= Rh,Ir; X = Cl,NO 3 ; X'= Cl,PF 6,NO 3)。硝酸盐络合物[M(μ-meppp)-M'Cp *(NO 3)] NO 3(M'= Rh([ 4a – c ] NO 3),Ir([ 5a – c ] NO 3); M = Ni(a),Pd(b),Pt(c))进一步与甲酸钠在水或甲醇中反应,转化为双硫醇盐和氢化物桥接的配合物[M(μ-meppp)(μ-H)M'