Cu-Mediated Direct Aryl CH Halogenation: a Strategy to Control Mono- and Di-Selectivity
作者:Zhi-Jun Du、Lian-Xun Gao、Ying-Jie Lin、Fu-She Han
DOI:10.1002/cctc.201300734
日期:2014.1
A protocol for the copper‐mediated directarylCHhalogenation is presented. Highly selective mono‐ and di‐halogenations are achieved by using acyl hypohalites, generated in situ from the readily available carboxylic acid and N‐halosuccinimides (NXS; X=Br and Cl) as powerful halogenating reagents. The correct choice of carboxylic acid additives and solvents is essential for both high yield and selectivity
提出了铜介导的直接芳基CH卤化的方案。通过使用酰基次卤酸盐来实现高度选择性的单卤化和二卤化,酰基次卤酸盐是由现成的羧酸和N-卤代琥珀酰亚胺(NXS; X = Br和Cl)原位生成的,作为强力卤化试剂。正确选择羧酸添加剂和溶剂对于高收率和选择性都至关重要。因此,使用廉价的铜催化剂和从容易负担得起且易于处理的羧酸和NXS(X = Br和Cl)原位生成酰基次卤酸盐卤化试剂的新策略为实际应用提供了优势。
Synthesis of New Donor‐Substituted Biphenyls: Pre‐ligands for Highly Luminescent (C^C^D) Gold(III) Pincer Complexes
latter can successfully be transmetalated to K[AuCl4] forming non‐palindromic [(C^C^D)AuIII] pincer complexes featuring a lateral pyridine (D=N) or N‐heterocycliccarbene (NHC, D=C’) donor. The latter is the first report on a pincer complex with two formally anionic sp2 and one carbenic carbon donor. The [(C^C^D)AuIII] complexes show intense phosphorescence in solution at room temperature. We discuss the
我们在此报告了制备吡啶和咪唑取代的2,2'-二卤代联苯的新合成策略。这些结构是适合配制成各自锡酚的预配体。后者可以成功地金属化为K [AuCl 4 ],形成具有侧吡啶(D = N)或N-杂环卡宾(NHC,D = C' )的非回文[[C ^ C ^ D)Au III ]钳形配合物) 捐赠者。后者是有关具有两个正式的阴离子sp 2和一个羧基碳供体的钳形配合物的首次报道。[(C ^ C ^ D)Au III配合物在室温下在溶液中显示强烈的磷光。我们讨论已制定的多步骤策略,并探讨综合挑战。制备的配合物已得到充分表征,包括X射线衍射分析。已通过吸收和发射光谱以及在准相对论两组分TD-DFT和GW / Bethe-Salpeter能级(包括自旋-轨道耦合)上研究了金(III)配合物的光物理性质。因此,我们阐明了非回文夹钳配体的电子影响,并揭示了所采用的不同配体的非辐射弛豫途径。