Para Chloro Ortho Amino Phenol

This compound carries three different functional handles on one small aromatic ring -- an amino group, a phenolic hydroxyl, and a chlorine substituent -- positioned so the amino and hydroxyl groups sit adjacent (ortho) to each other while the chlorine sits para to the hydroxyl. That adjacency between the amino and hydroxyl groups is what gives this compound its documented coupling behaviour in oxidative dye chemistry, parallel in principle to how the phenylenediamines elsewhere in our range behave in the same chemistry, but with a distinctly different colour-development profile contributed by the phenolic group and the chlorine substituent.

It is documented as a coupling component in oxidative hair-dye formulations (used alongside a primary intermediate such as a phenylenediamine to build the final colour), and more generally as an intermediate in azo-dye and photographic-chemical synthesis, where its combination of amino, hydroxyl, and halogen substituents is a useful building block for further functionalisation.

Where it fits in the synthesis chain

We supply Para Chloro Ortho Amino Phenol itself as a dye and photographic-chemical intermediate. We do not manufacture or supply finished hair-dye formulations, dyes, or photographic products made using it.

Grades we supply

98% and 99% grades are both seen across the trade.

Para Chloro Ortho Amino Phenol is made industrially by reduction of the corresponding nitro-chlorophenol precursor (2-nitro-4-chlorophenol), converting the nitro group to an amino group while leaving the hydroxyl and chlorine substituents untouched.

The reduction step uses catalytic hydrogenation or a chemical reducing agent under controlled conditions to achieve clean, selective conversion of the nitro group.

The crude product is purified by crystallisation and packed promptly under conditions that limit air and light exposure, since aminophenols of this type are prone to oxidative darkening on standing.

A three-substituent structure worth describing precisely

We want to be precise about this compound's substitution pattern rather than describe it loosely: the amino and hydroxyl groups are adjacent (ortho) to one another, while the chlorine sits on the ring position para to the hydroxyl group -- hence the name "para-chloro-ortho-amino-phenol," read relative to the phenol's hydroxyl group as the reference point. Getting this geometry right matters, because it's the ortho amino/hydroxyl adjacency, not the chlorine's position by itself, that drives this compound's documented oxidative-coupling dye chemistry.