Electro-Mechanochemical Atom Transfer Radical Cyclizations using Piezoelectric BaTiO3.,Angewandte Chemie International Edition

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Electro-Mechanochemical Atom Transfer Radical Cyclizations using Piezoelectric BaTiO3.
Angewandte Chemie International Edition ( IF 16.1 ) Pub Date : 2020-06-09 , DOI: 10.1002/anie.202003565
Christian Schumacher ₁ , José G Hernández ₁ , Carsten Bolm ₁

Affiliation

The formation and regeneration of active Cu^I species is a fundamental mechanistic step in copper‐catalyzed atom transfer radical cyclizations (ATRC). Typically, the presence of the catalytically active Cu^I species in the reaction mixture is secured by using high Cu^I catalyst loadings or the addition of complementary reducing agents. In this study it is demonstrated how the piezoelectric properties of barium titanate (BaTiO₃) can be harnessed by mechanical ball milling to induce electrical polarization in the strained piezomaterial. This strategy enables the conversion of mechanical energy into electrical energy, leading to the reduction of a Cu^II precatalyst into the active Cu^I species in copper‐catalyzed mechanochemical solvent‐free ATRC reactions.

中文翻译：

使用压电 BaTiO3 进行机电化学原子转移自由基环化。

活性 Cu ^I物质的形成和再生是铜催化原子转移自由基环化（ATRC）的基本机制步骤。通常，通过使用高 Cu ^I催化剂负载量或添加补充还原剂来确保反应混合物中催化活性 Cu ^I物质的存在。在这项研究中，演示了如何通过机械球磨来利用钛酸钡（BaTiO ₃ ）的压电特性来在应变压电材料中诱导电极化。该策略能够将机械能转化为电能，从而在铜催化的机械化学无溶剂 ATRC 反应中将 Cu ^II预催化剂还原为活性 Cu ^I物质。

更新日期：2020-06-09

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