Von Richter rearrangement

What is von Richter rearrangement?

The von Richter rearrangement, also known as the von Richter reaction, involves the carboxylation of para– or meta-substituted aromatic nitro compounds with cyanate at temperatures ranging from 120-270 °C.

von Richter rearrangement - von Richter reaction - general reaction scheme
von Richter rearrangement

In the von Richter rearrangement, the carboxyl group enters with cine substitution in a position ortho to the eliminated nitro group, resulting in the formation of a new substituted aromatic compound.