Green photocatalytic syntheses using water as solvent/hydrogen source/oxygen source

Water as an abundant natural source is also an easily available and non-toxic chemical reagent. From the viewpoint of green chemistry, the application of water in organic synthesis is highly attractive. In this minireview, the recent advances in the application of water as a green solvent, as a hydrogen source, and as an oxygen source are summarized based on the selected examples between 2021 to 2022.