effective direct hydrogen‐atom transfer catalyst for C−H activation. Using the alkylation of C−Hbonds with electron‐deficient alkenes as a model study revealed an extremely broad substrate scope, enabling easy access to a variety of important synthons. This eosin Y‐based photocatalytic hydrogen‐atom transfer strategy is promising for diverse functionalization of a wide range of native C−Hbonds in a green
Catalytic Acceptorless Dehydrogenation of Aliphatic Alcohols
作者:Hiromu Fuse、Harunobu Mitsunuma、Motomu Kanai
DOI:10.1021/jacs.0c00123
日期:2020.3.4
aliphatic secondary alcohols to ketones undervisiblelight irradiation at room temperature by devising a ternary hybrid catalyst system comprising a photoredox catalyst, a thiophosphate organocatalyst, and a nickel catalyst. The reaction proceeded through three main steps: hydrogen atom transfer from the α-C-H bond of an alcohol substrate to the thiyl radical of the photo-oxidized organocatalyst, interception
recent efforts, a catalytic and convenient strategy for the direct alkylation of unactivated allylic or benzylic sp3 C-H bonds remains a formidable challenge facing the synthesis community. We herein report an unprecedented allylic/benzylic alkylation using only an organo-photoredox catalyst, which enables coupling of a broad scope of alkenes/arenes and electron-deficient alkenes in an atom- and redox-economic
Novel radical transfer reagentsunder photoirradiation conditions were developed by the use of benzothiazoline derivatives. These reagents enabled both hydroalkylation and hydroacylation of alkenes underneutralconditions at ambient temperature without any toxic reagents or an excess amount of metals. A mechanistic study was carried out to elucidate the radical process.
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。