1-(2,6-Dichlorophenyl)indolin-2-one

In established production routes, this indolinone derivative serves as a precursor that enables efficient incorporation of the 2,6-dichlorophenyl moiety, followed by ring opening and subsequent transformations to form the diclofenac backbone. Its controlled formation and conversion are important for process efficiency, impurity control, and overall yield in commercial diclofenac synthesis. 1-(2,6-Dichlorophenyl)indolin-2-one serves as a key synthetic intermediate in the manufacture of diclofenac and diclofenac sodium.