Metal

Catalysis

Ecology

Biology

Ketone

Photochemistry

Materials science

Alder

Diels–Alder reaction

Visible spectrum

Thermodynamics

Physics

Homogeneous

Organic chemistry

Chemistry

Optoelectronics

Green Chemistry

An efficient metal-free homogeneous system has been developed for the Diels–Alder reaction between electron-rich dienophiles and dienes under visible-light conditions. The mechanism of this reaction has been proposed based on the experimental evidence.

A simple ketone as an efficient metal-free catalyst for visible-light-mediated Diels–Alder and aza-Diels–Alder reactions