Process for producting bis(4-hydroxy-3-nitrophenyl) compound

Abstract

The present invention relates to a process for producing a bis(4-hydroxy-3-nitrophenyl) compounds, characterized by nitrating a bis(4-hydroxyphenyl) compound wherein two phenyl groups are bonded to each other directly or through an electron-donating bridging group, sulfoxide group, sulfone group or carbonyl group in an inert solvent using nitric acid under the condition of substantially free from any other acid. According to the process, the target compounds reduced in the content of trinitrates can be produced in high yield and further recrystallizing the compound easily gives in high yield a high-purity products suitable for use as a raw material of producing a heat-resistant polymer and so on because the content of a trinitro-substitued compound in that compound is low.

Dependencies are inferred from the claim text.