Organic chemistry of subvalent transition metal complexes. Part 7. Desulfurization of dibenzothiophene by nickel(0) complexes: evidence for electron transfer in oxidative additions
σ-Bond initiated generation of aryl radicals from aryl diazonium salts
作者:Elene Tatunashvili、Bun Chan、Philippe E. Nashar、Christopher S. P. McErlean
DOI:10.1039/d0ob00205d
日期:——
transform aryl diazoniumsalts into aryl radicals. Experimental and computational studies show that Hantzsch esters transfer hydride to aryl diazonium species, and that oxygen initiates radical fragmentation of the diazene intermediate to produce aryl radicals. The operational simplicity of this addition-fragmentation process for the generation of aryl radicals, by a polar-radical crossover mechanism, has been
Organic chemistry of subvalent transition metal complexes. 12. Hydrodesulfurization of organosulfur heterocycles by metal hydride-nickel(0) complexes: accelerated single-electron transfer in carbon-sulfur bond cleavage
作者:john J. Eisch、Lawrence E. Hallenbeck、Kyoung Im. Han
DOI:10.1021/ja00284a045
日期:1986.11
The novel nickel complex, LiAlH/sub2/(THF)/sub n/ x C/sub 10/H/sub 8/N/sub2/ x Ni (2), which results from the interaction in a THF solution of (2,2'-bipyridyl)(1,5-cyclooctadiene)nickel (1) with LiAlH/sub 4/ in a 1:1 molar ratio is a powerful desulfurizing agent in homogeneous solution for such aromatic sulfur hetercycles as dibenzothiophene (3), phenoxathiin (11), phenothiazine (12), and thianthrene
Experimental and theoretical studies on gold(<scp>iii</scp>) carbonyl complexes: reductive C,H- and C,C bond formation
作者:Alexander Ahrens、Danilo M. Lustosa、Leonhard F. P. Karger、Marvin Hoffmann、Matthias Rudolph、Andreas Dreuw、A. Stephen K. Hashmi
DOI:10.1039/d1dt01315g
日期:——
The reactivity of cationic (C^C)gold(III) carbonyl complexes was investigated. While the in situ-formed IPrAu(bph)CO+ complex (bph = biphenyl-2,2′-diyl) does not undergo a migratory insertion of CO into the neighboring gold–carbon bond, nucleophiles can attack the coordinated CO moiety intermolecularly. Water as a nucleophile initiates a CO2 extrusion combined with a reductive C,H bond formation. The
研究了阳离子(C^C)金(III)羰基配合物的反应性。虽然原位形成的 IPrAu(bph)CO +复合物(bph = biphenyl-2,2'-diyl)不会将 CO 迁移插入相邻的金 - 碳键,但亲核试剂可以分子间攻击协调的 CO 部分。作为亲核试剂的水会引发 CO 2挤出以及还原性 C,H 键的形成。以前从未观察到从中间金(III)羰基快速形成金(I)物种,并且显示(C^C)和(C^N^C)金(III)羰基之间的反应性存在显着差异。据报道后者形成稳定的金(III )通过WGS 反应氢化。在甲醇作为亲核试剂攻击金 ( III ) 羰基的情况下,没有观察到CO 2 的挤出。相反,中间的金 ( III ) 羧基络合物通过还原性 C-C 键消除形成芳基羧酸酯。关于该机制的实验和理论研究解释了观察到的选择性,并为难以捉摸的金 ( III ) 羰基化合物的反应性提供了新的见解。
Rhodium-Catalyzed Deuterated Tsuji–Wilkinson Decarbonylation of Aldehydes with Deuterium Oxide
The recent surge in the applications of deuterated drug candidates has rendered an urgent need for diverse deuterium labeling techniques. Herein, an efficient Rh-catalyzed deuterated Tsuji–Wilkinson decarbonylation of naturally available aldehydes with D2O is developed. In this reaction, D2O not only acts as a deuterated reagent and solvent but also promotes Rh-catalyzed decarbonylation. In addition
最近氘代候选药物的应用激增,迫切需要各种氘标记技术。在此,开发了一种高效的 Rh 催化的氘代 Tsuji-Wilkinson 用 D 2 O 对天然可用的醛进行脱羰反应。在该反应中,D 2 O 不仅充当氘代试剂和溶剂,而且还促进 Rh 催化的脱羰。此外,从 α,β-不饱和醛合成末端单氘代烯烃的脱羰策略也触手可及。
Coupling photocatalytic overall water splitting with hydrogenation of organic molecules: a strategy for using water as a hydrogen source and an electron donor to enable hydrogenation
fascinating to use water as a hydrogensource to enable the hydrogenation of organic molecules in green chemistry. Nevertheless, current light-driven strategies suffer from an expense of reductants for proton reduction due to a high difficulty in overall water splitting. Herein, we have overcome this challenge and report that light-induced overall water splitting is coupled with hydrogenation of aryl bromides
在绿色化学中使用水作为氢源来实现有机分子的氢化是很有趣的。然而,由于整体水分解的高度困难,当前的光驱动策略受到用于质子还原的还原剂的费用的影响。在此,我们克服了这一挑战并报告了光诱导的整体水分解与芳基溴化物的氢化通过可回收的 Pd/gC 3 N 4之间的协同催化作用相结合。和 Fe 物种,这开辟了一条光催化途径,可以将水用作电子供体和氢源,以实现芳基溴化物的氢化,避免使用额外的还原剂。此外,温和的条件、可回收的催化剂系统和使用可见光作为能源使这一过程更加环保。本方法还可以有效合成各种高附加值的氘代芳烃。这项工作将指导化学家使用水作为电子供体和氢源来开发各种有机化合物加氢的绿色程序。