Water is a green reaction medium, while visible light represents a renewable, clean, and abundant energy source. The recent advances in visible-light-mediated organic transformations in water are summarized.

Alkyl diacyl peroxides were demonstrated to be efficient alkylating reagents for the visible-light-induced 4CzIPN-catalyzed direct C–H alkylation of N-heteroaromatics.

A tetrabutylammonium decatungstate (TBADT)-photocatalyzed direct coupling of inert alkanes and quinoxalin-2(1H)-ones with H₂ evolution was developed at room temperature.