Direct addition of alkylzirconocenes to activatedalkenes was found, for the first time. Octyl- and decylzirconocene chloride reacted with benzylidenemalononitrile to give the corresponding addition products after hydrolysis in 86% and 79% yield, respectively. Zirconacyclopentanes showed a similar reactivity toward activatedalkenes with a two-electron-withdrawing group. On the other hand, treatment
Alkyl‐GeMe
<sub>3</sub>
: Neutral Metalloid Radical Precursors upon Visible‐Light Photocatalysis
作者:Qing‐Hao Xu、Li‐Pu Wei、Bin Xiao
DOI:10.1002/anie.202115592
日期:2022.3.28
Alkyl-GeMe3 was proven to be an effective radicalprecursor under visible-light photocatalysis. The metalloid nature of Ge allows single-electron transfer (SET) at the neutral Ge center and leads to advantages in separation and derivatization.
在可见光光催化下,烷基-GeMe 3被证明是一种有效的自由基前体。Ge 的准金属性质允许在中性 Ge 中心进行单电子转移 (SET),并在分离和衍生化方面具有优势。
Iron-Catalyzed Photoredox Functionalization of Methane and Heavier Gaseous Alkanes: Scope, Kinetics, and Computational Studies
作者:Qingqing Zhang、Shuyang Liu、Jinglan Lei、Yongqiang Zhang、Changgong Meng、Chunying Duan、Yunhe Jin
DOI:10.1021/acs.orglett.2c00224
日期:2022.3.18
Herein, we report the development of the photocatalytic C–H functionalization of methane, ethane, and heavier gaseousalkanes with good yields and selectivity, broad scope (57 examples), mild conditions, and low cost. Kinetics and density functional theory calculations were investigated for the key photoinduced ligand-to-metal charge transfer and hydrogen atom transfer processes to reveal the detailed
Photoinduced Pyridine N‐oxides Catalyzed Carbon Radical Generation from Alkylboronic Acids
作者:Cristina Ascenzi‐Pettenuzzo、Juliet Nganda、Yongming Deng
DOI:10.1002/cctc.202300953
日期:2023.11.22
Photoexcited 4-nitropyridine N-oxide biradical was found to catalyze the carbon radical generation from alkylboronic acids with blue LED irradiation without exogenous photocatalysts. With a wide range of readily available aliphatic boronic acids, including methyl boronic acid, the developed catalytic system allowed simple and robust applicability for alkylation, amination, and cyanation reactions.
研究发现,光激发的 4-硝基吡啶 N-氧化物双自由基可以在没有外源光催化剂的情况下,用蓝色 LED 照射催化烷基硼酸产生碳自由基。凭借各种易于获得的脂肪族硼酸(包括甲基硼酸),所开发的催化系统可以简单而强大地应用于烷基化、胺化和氰化反应。
2,2’‐Biquinoline‐Based Recyclable Electroauxiliaries for the Generation of Alkyl Radicals via C−C Bond Cleavage
electroauxiliaries have successfully been developed as suitable reagents for the site-selective generation of alkylradicals. Primary, secondary and tertiaryalkylradicals could be generated and several free radical reactions could be studied. The platform has the advantage of recyclability, which makes these alkylradical precursors superior compared to previous N-heterocyclic electroauxiliaries.