Quantum mechanics

Catalysis

Polymerization

Engineering

Chemical physics

Mechanochemistry

Photochemistry

Metallurgy

Materials science

Ceramic

Embedded system

Solvent

Computer science

Electron transfer

Chemical engineering

Barium titanate

Reducing agent

Ball mill

Physical chemistry

Polarization (electrochemistry)

Polymer

Physics

Nanotechnology

Organic chemistry

Dielectric

Atom (system on chip)

Composite material

Chemistry

Piezoelectricity

Electron

Atom-transfer radical-polymerization

Optoelectronics

Copper

Angewandte Chemie International Edition

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 (BaTiO 3 ) 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.

Electro‐Mechanochemical Atom Transfer Radical Cyclizations using Piezoelectric BaTiO<sub>3</sub>

Electro‐Mechanochemical Atom Transfer Radical Cyclizations using Piezoelectric BaTiO3

Electro‐Mechanochemical Atom Transfer Radical Cyclizations using Piezoelectric BaTiO₃