Skeletal Editing of Chromone-Fused Dienes to Cyclopropane by Photochemical Carbon Deletion

A visible-light-driven, photocatalyst-free, air-assisted carbon cleavage of dienes was achieved. Photochemical editing of dienes via an electron donor–acceptor (EDA) complex facilitates direct access to cyclopropane derivatives. This innovative methodology creates an opportunity for the efficient access to valuable cyclopropane derivatives under mild and ambient conditions.