Benzylic C–H arylation of azaarylmethanes with aryl sulfides has been developed by using a Pd-NHC catalyst and an amide base. Various azaarylmethanes and aryl sulfides were involved in the reaction to afford the corresponding diarylmethanes in good to excellent yields. Moreover, triarylmethane synthesis was accomplished through iterative arylations of 2- or 4-methylpyridine with two different aryl
Palladium-Catalyzed Zinc-Amide-Mediated CH Arylation of Fluoroarenes and Heteroarenes with Aryl Sulfides
作者:Shinya Otsuka、Hideki Yorimitsu、Atsuhiro Osuka
DOI:10.1002/chem.201502101
日期:2015.10.12
heteroarenes with aryl sulfides proceeds smoothly with the aid of a palladium–N‐heterocyclic carbene catalyst. A bulky zinc amide, TMPZnCl⋅LiCl, plays a key role as an effective base to generate the corresponding arylzinc species in situ. This arylation protocol is practically much easier to perform than our previous method, which necessitates preparation of the arylzincreagents in advance from the corresponding
Ç polyfluoroarenes和杂芳烃的与芳基硫化物ħ芳基化用钯- N-杂环卡宾催化剂的帮助下顺利进行。甲笨重锌酰胺,TMPZnCl ⋅的LiCl,起着以原位产生相应的芳基锌物种的有效碱关键作用。该芳基化方案实际上比我们以前的方法更容易执行,后者需要从相应的芳基卤化物预先制备芳基锌试剂。通过硫特异性反应(如S N Ar磺酰化反应和扩展的Pummerer反应)制备的芳基硫化物会经历这种直接芳基化,从而提供有趣的转化,而这些转化是传统的基于卤素的有机合成难以实现的。
Transmission of electronic effects via a SiMe2 spacer in 4-mono- and 4,4′-disubstituted diphenyldimethylsilanes: 29Si and 13C NMR spectroscopy and PM3 semi-empirical calculations
作者:Cornelis A. van Walree、Xavier Y. Lauteslager、Andreas M.A. van Wageningen、Jan W. Zwikker、Leonardus W. Jenneskens
DOI:10.1016/0022-328x(95)05473-3
日期:1995.6
13C NMR studies were performed on series of 4-substituted phenyltrimethylsilanes and 4-substituted and 4,4′-disubstituted diphenyldimethylsilanes. Within each series linear relationships are found between the chemicalshifts and (a) the Hammett substituentconstants σp and (b) the PM3-calculated total atomic charges. It is inferred that the SiMe2 σ-type spacer weakly mediates substituenteffects in
对一系列4-取代的苯基三甲基硅烷和4-取代的和4,4'-二取代的二苯基二甲基硅烷进行了约29 Si和13 C NMR研究。在每个系列的线性关系被化学位移和(a)的哈米特取代基常数之间发现σ p和(b)的PM3计算总原子电荷。据推断,所述森达2 σ型分隔弱介导通过键偏振机构处于基态的取代基的影响。与4-取代的和4,4'-二取代的二苯基甲烷的可用数据进行的比较表明,SiMe 2基团比CH 2基团更好地传递电子效应。
Arylcalcium Hydrides as Precursors to Alkoxides and Aryloxides of Calcium
作者:John P. Dunne、Matthias Tacke、Carola Selinka、Dietmar Stalke
DOI:10.1002/ejic.200390184
日期:2003.4
henol, and 2,4,6-tri-tert-butylphenol resulted in the formation of calcium aryloxides in yields > 95%. [Ca(2,4,6-tBu3C6H2O)2(THF)3] crystallises from a THF solution as a distorted trigonal bipyramid, with two THFligands in the trans-axial positions and the third THFligand and both aryloxide groups in equatorial positions. The Ca−OAryl bond length was found to average at 2.181(3) A. The Ca−O−CAryl
ipso-Fluorination of aryltrimethylsilanes using xenon difluoride
作者:Aileen P. Lothian、Christopher A. Ramsden、Maxine M. Shaw、Rachel G. Smith
DOI:10.1016/j.tet.2011.02.016
日期:2011.4
Reaction of aryltrimethylsilanes with xenondifluoride in C6F6/Pyrex® at room temperature gives aryl fluorides in good yield. The reaction is inhibited when acetonitrile is used as solvent but proceeds well in CFCl3/Pyrex® or CH2Cl2/Pyrex®. Pyrex® appears to be a very effective heterogeneous catalyst for this ipso-fluorination. The reaction does not proceed in PTFE, quartz, soda glass or glassy-carbon