LED‐NMR Monitoring of an Enantioselective Catalytic [2+2] Photocycloaddition,ChemPhotoChem

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LED‐NMR Monitoring of an Enantioselective Catalytic [2+2] Photocycloaddition
ChemPhotoChem ( IF 3.0 ) Pub Date : 2020-05-28 , DOI: 10.1002/cptc.202000094
Kazimer L Skubi _{1,

2} , Wesley B Swords ₁ , Heike Hofstetter ₁ , Tehshik P Yoon ₁

Affiliation

We report that an NMR spectrometer equipped with a high‐power LED light source can be used to study a fast enantioselective photocatalytic [2+2] cycloaddition. While traditional ex situ applications of NMR provide considerable information on reaction mechanisms, they are often ineffective for observing fast reactions. Recently, motivated by renewed interest in organic photochemistry, several approaches have been reported for in situ monitoring of photochemical reactions. These previously disclosed methods, however, have rarely been applied to rapid (<5 min) photochemical reactions. Furthermore, these approaches have not previously been used to interrogate the mechanisms of photocatalytic energy‐transfer reactions. In the present work, we describe our experimental setup and demonstrate its utility by determining a phenomenological rate law for a model photocatalytic energy‐transfer cycloaddition reaction.

中文翻译：

对映选择性催化 [2+2] 光环加成反应的 LED-NMR 监测

我们报告称，配备高功率 LED 光源的核磁共振波谱仪可用于研究快速对映选择性光催化 [2+2] 环加成反应。虽然核磁共振的传统异位应用提供了大量有关反应机制的信息，但它们通常无法有效观察快速反应。最近，由于人们对有机光化学重新产生兴趣，已经报道了几种原位监测光化学反应的方法。然而，这些先前公开的方法很少应用于快速（<5分钟）的光化学反应。此外，这些方法以前没有被用来探究光催化能量转移反应的机制。在目前的工作中，我们描述了我们的实验设置，并通过确定模型光催化能量转移环加成反应的唯象速率定律来证明其实用性。

更新日期：2020-05-28

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