Remote sp3 C–H Amination of Alkenes with Nitroarenes
作者:Jichao Xiao、Yuli He、Feng Ye、Shaolin Zhu
DOI:10.1016/j.chempr.2018.04.008
日期:2018.7
Direct installation of a functional group at remote, unfunctionalized sites in an alkyl chain is a synthetically valuable but rarely reported process. The remote relay hydroarylamination of distal and proximal olefins, and of olefin isomeric mixtures, has been achieved through NiH-catalyzed alkene isomerization and sequential reductive hydroarylamination with nitroarenes. This provides an attractive
α-Alkyldibenzylketones included in cation exchanged faujasite type zeolites show photobehavior different from that in isotropic organic solvents. Rearrangement and disproportionation which do not contribute in solution are the major processes within the cavities of faujasites. Cation size plays a major role in controlling the pathway pursued by the primary and the secondary radical pair.
ligand-controlled nickel migration/arylation. This general protocol allows the use of abundant and bench-stable alkyl bromides and aryl bromides for the synthesis of a wide range of structurally diverse 1,1-diarylalkanes in excellent yields and high regioselectivities under mild conditions. We also demonstrated that alkyl bromide could be replaced by the proposed olefin intermediate while using n-propyl bromide/Mn0
Photochemical oxidation and dimerization of alkylbenzenes. Selective reactions of the alkyl side groups
作者:Mordechai Pasternak、Abraham Morduchowitz
DOI:10.1016/s0040-4039(00)88319-7
日期:1983.1
Irradiations of alkylbenzene compounds in an oxygen atmosphere result exclusively in oxidation reactions, while in a less oxidative environment dimerization processes predominate. Under all conditions studied, the reactions took place only at one benzyl position.
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