Benzylation of Acetylene. I. Formation of 3,4-Diphenyl-1-butyne and 3,4-Diphenyl-1,2-butadiene
作者:Teisuke Ando、Niichiro Tokura
DOI:10.1246/bcsj.30.259
日期:1957.3
between benzyl chlorides and metal acetylides, prepared from metallic lithium and sodium in liquid ammonia resulted in the formation of new compounds, i. e. 3,4-diphenyl-1-butyne and 3,4-diphenyl-1,2-butadiene. The benzylation of acetylene did not stop at benzylacetylene but another benzyl group was introduced to form 3,4-diphenyl-1-butyne. 3,4-Di-phenyl-1,2-butadiene was formed by the isomerisation of
Cross-Coupling of Nonactivated Primary and Secondary Alkyl Halides with Aryl Grignard Reagents Catalyzed by Chiral Iron Pincer Complexes
作者:Xile Hu、Gerald Bauer、Chi Cheung
DOI:10.1055/s-0034-1380136
日期:——
Abstract Iron(III) bisoxazolinylphenylamido (bopa) pincer complexes are efficient precatalysts for the cross-coupling of nonactivated primary and secondary alkyl halides with phenyl Grignardreagents. The reactions proceed at room temperature in moderate to excellent yields. A variety of functional groups can be tolerated. The enantioselectivity of the coupling of secondary alkyl halides is low. Iron(III)
Dual Rh−Ru Catalysts for Reductive Hydroformylation of Olefins to Alcohols
作者:Fábio M. S. Rodrigues、Peter K. Kucmierczyk、Marta Pineiro、Ralf Jackstell、Robert Franke、Mariette M. Pereira、Matthias Beller
DOI:10.1002/cssc.201800488
日期:2018.7.20
described. Apart from terminal, di‐ and trisubstituted olefins, for the first time the less active internal C−C double bond of tetrasubstituted alkenes can also be utilized. As an example, 2,3‐dimethylbut‐2‐ene is converted into the corresponding n‐alcohol with high yield (90 %) as well as regio‐ and chemoselectivity (>97 %). Key for this development is the use of a combination of Rh complexes with bulky
Templation of the Excited-State Chemistry of α-(<i>n</i>-Alkyl) Dibenzyl Ketones: How Guest Packing within a Nanoscale Supramolecular Capsule Influences Photochemistry
作者:Corinne L. D. Gibb、Arun Kumar Sundaresan、V. Ramamurthy、Bruce C. Gibb
DOI:10.1021/ja7107917
日期:2008.3.1
resulted from the well-known Norrish type I reaction. However, within the capsule the excited-state chemistry of the eight ketones was dependent on the alkylchainlength. The first group consisted of alpha-hexyl, alpha-heptyl, and alpha-octyl dibenzyl ketones that yielded large amounts of Norrish type II products within the host, while in solution the major products were from Norrish type I reaction
已经在各向同性溶液和水溶性胶囊中探索了能够进行 II 型和/或 I 型光反应的八种 α-烷基二苄基酮(烷基 = CH3 到 n-C8H17)的激发态行为。该研究由两部分组成:探索激发态化学的光化学和揭示胶囊内每个客体包装的核磁共振分析。核磁共振数据(COSY、NOESY 和 TOCSY 实验)表明,α-烷基二苄基酮与由两个空腔形成的胶囊之间的三元配合物在动力学上是稳定的,客体分为三个由 α-烷基长度调节的填充基序链。本质上,宿主充当外部模板,以促进形成不同的客体构象异构体。所有八位客体在己烷或缓冲溶液中辐照后的主要产物来自众所周知的 Norrish I 型反应。然而,在胶囊内,八种酮的激发态化学取决于烷基链长度。第一组由α-己基、α-庚基和α-辛基二苄基酮组成,在宿主内产生大量Norrish II 型产物,而在溶液中,主要产物来自Norrish I 型反应。第二组由α-丁基和α-戊基二苄基
The reaction of benzotrihalides and benzal halides with magnesium. Synthetic and mechanistic studies
作者:E.C. Ashby、Dheya M. Al-Fekri
DOI:10.1016/0022-328x(90)85094-f
日期:1990.7
= Cl, Br, and F were allowed to react with magnesium in THF at room temperature. When the halide was chloride or bromide, the trihalide gave diphenylacetylene in high yield in addition to several minor products which were identified. No reaction was observed when the halide was fluoride. When the corresponding dichloride was allowed to react with magnesium in THF, stilbene was formed as the major product
X = Cl,Br和F的苯并三卤化物(PhCX 3)在室温下与镁在THF中反应。当卤化物是氯化物或溴化物时,三卤化物除了鉴定出几种次要产物外,还以高收率得到了二苯乙炔。当卤化物是氟化物时,没有观察到反应。当使相应的二氯化物与镁在THF中反应时,形成为主要产物。讨论了这些反应的可能机理。