An efficient in situ prepared superacid BF3–H2O promoted benzylation of arenes using benzyl alcohols and acetates achieves various diarylalkanes.
一种高效的原位制备的超强酸BF3-H2O促进的芳烃苄基化反应,使用苄醇和醋酸酯制备各种二芳基烷烃。
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
Catalyst-free photo-reductions of aromatic olefins and carbonyl compounds
作者:Jieliang Wu、Boyu Yan、Jiangtao Meng、Enqin Yang、Xiushen Ye、Qiuli Yao
DOI:10.1039/d2ob01353c
日期:——
We describe herein a catalyst-free, traditional reductant-free strategy for the direct photoinduced hydrogenation or deuteration of aromatic olefins, ketones, and aldehydes with simple bases as the only additives. A broad range of substrates were demonstrated with high yields and deuterium incorporations. Mechanistic experiments indicate a radical mechanism.
inconvenient reagents. Herein, we report a one-pot relay bicatalysis system for AAC involving (pincer)Ir-catalyzed alkane transfer dehydrogenation and Fe(OTf)3-catalyzed olefin hydroarylation. This system exhibits broad scope and is particularly effective for alkylation of arenes with arylalkanes to form 1,1-diarylalkanes with high chemo- and regioselectivity, making it potentially useful for late-stage