▎ 摘　　要

Highly functionalized graphene were obtained through a zwitterion intermediate cycloaddition onto exfoliated graphene flakes under new reaction conditions. The functionalized graphene obtained formed stable dispersions in common solvents, including dimethylformamide (DMF), CHCl3 and water. Its dispersion in water is especially useful in a wide range of areas, such as composites, devices and biological applications.