Para Chloro Ortho Nitro Aniline
A chloro-nitroaniline diazo-component intermediate, known industrially as PCONA / Fast Red 3GL Base, supplied by Chelora Chemicals for azo pigment and dye synthesis — exported from Indonesia in technical and high-purity grades, with full batch documentation on every shipment.
What Para Chloro Ortho Nitro Aniline is, and why buyers source it
A working overview of the compound's chemistry, its well-known identity as a named diazo base in the colourant industry, and the grades Chelora Chemicals keeps in regular supply.
Para Chloro Ortho Nitro Aniline — 4-chloro-2-nitroaniline — carries a chlorine para to the amino group and a nitro group ortho to it. This is one of the better-known chloronitroaniline diazo components in the colourant trade: it is widely sold and specified under its trade designation PCONA, and carries the formal Colour Index identity C.I. Azoic Diazo Component 9, with Fast Red 3GL Base as a common commercial synonym. The ortho-nitro group both deactivates the amine toward basic reactivity and, once diazotized, stabilizes the resulting diazonium salt, which is part of why this particular isomer became a standard in azoic pigment manufacture.
At room temperature it is a bright orange crystalline solid, only sparingly soluble in water but soluble in common organic solvents such as acetone and ethanol.
Where it fits in the synthesis chain
As C.I. Azoic Diazo Component 9, this compound is diazotized and coupled with a naphthol AS-type coupler to build "Fast Red" and related azoic colourants used in textile printing and pigment manufacture. The same scaffold is also used as a pharmaceutical intermediate in routes that call for this specific chloro-nitro substitution pattern.
Grades we supply
Chelora Chemicals offers Para Chloro Ortho Nitro Aniline in technical grade (≈97% assay) for standard industrial dye and pigment manufacture, and high-purity grade (99%+) for applications sensitive to isomer carryover or colour body. Both grades are supplied with a batch-wise certificate of analysis so your incoming QC team can verify the parameters you ordered against.
How Para Chloro Ortho Nitro Aniline is made
An overview of the production route for orientation purposes. Our manufacturing partners' own process parameters and in-process controls are proprietary and are not disclosed beyond what is needed to interpret the certificate of analysis.
Para Chloro Ortho Nitro Aniline is manufactured from para-chloroaniline (or an equivalent chloronitrobenzene precursor) by controlled ring nitration that installs a nitro group ortho to the existing amino or amino-precursor substituent, or alternatively from a dichloronitrobenzene by selective ammonolysis of the chlorine para to the nitro group, which is strongly activated toward nucleophilic displacement by that nitro substituent.
Where nitration of para-chloroaniline is used, the amine is first protected (commonly by acetylation) to moderate the ring's reactivity and direct nitration cleanly to the position ortho to nitrogen, after which the amide is hydrolyzed back to the free amine. Where the ammonolysis route is used instead, a dichloronitrobenzene precursor reacts with aqueous or gaseous ammonia under pressure, displacing only the activated chlorine and leaving the nitro group and the second (less activated) chlorine or hydrogen untouched as designed.
After the key step, the crude product is washed, recrystallized and dried to remove unreacted starting material, regiochemical by-products and process salts before packing. This recrystallization is where technical grade and high-purity grade material part ways, and is also what sets the product's characteristic bright orange colour.
Why this isomer became an industry standard
The combination of an ortho-nitro group (which stabilizes the diazonium salt once formed) and a para-chlorine (which has limited further reactivity under coupling conditions) gives this particular substitution pattern good manufacturing robustness and a consistent, well-characterized shade when coupled — which is why it was adopted early as a named Colour Index diazo component and remains a standard reference material in the azoic dye trade.
Industries and processes that use it
Para Chloro Ortho Nitro Aniline is consumed almost entirely in azoic colourant manufacture, with secondary volumes going into pharmaceutical synthesis. The fields below account for most of the global demand we see through our export desk.
Azoic Dyes & Pigments (Fast Red Base)
As C.I. Azoic Diazo Component 9, it is diazotized and coupled with naphthol AS-type couplers to build Fast Red-type azoic colourants used in textile printing and pigment manufacture.
Pharmaceutical Intermediates
Used as a chloro-nitroaniline building block in pharmaceutical synthesis routes that call for this specific substitution pattern.
Fine Chemical Synthesis
A starting material for further nitro- and amino-substituted aromatic intermediates used across process and research chemistry.
Specialty Colourant Intermediates
Carried forward into other azoic and pigment chemistries where the para-chloro, ortho-nitro substitution pattern is part of the target structure.
How the molecule is typically carried forward
The ortho-nitro group strongly deactivates the amino group toward basic reactivity but stabilizes the diazonium salt once formed, which is exactly the balance that makes this compound a standard azoic diazo component.
Diazotization (Diazo Component Use)
Under the stronger acid conditions used industrially for weakly basic nitroanilines, the amino group is converted to a diazonium salt, stabilized by the adjacent ortho-nitro group — the entry point for Fast Red-type azoic colourant manufacture.
Azo Coupling
The diazonium salt is coupled with a naphthol AS-type coupler to form the azo (–N=N–) chromophore that gives the finished colourant its characteristic red shade.
Acylation
Reaction with an acid chloride or anhydride gives an amide, used in pharmaceutical and fine-chemical synthesis routes built on this scaffold.
Nitro Group Reduction
Catalytic or chemical reduction of the nitro group gives the corresponding diamine, a route used to access further dye, rubber-chemical and pharmaceutical intermediates.
Para Chloro Ortho Nitro Aniline against other chloronitroanilines we supply
Buyers sourcing this Fast Red diazo base often need a related chloro- or dichloro-nitroaniline for a neighbouring shade or a different coupling partner. A quick reference to what else is on our regular supply list.
| Product | CAS Number | Category | Notes |
|---|---|---|---|
| Para Chloro Ortho Nitro Aniline | 89-63-4 | Mono-chloro mono-nitro primary arylamine | The product on this page — our most regularly stocked grade; known industrially as PCONA / Fast Red 3GL Base. |
| Ortho Chloro Para Nitro Aniline | 121-87-9 | Mono-chloro mono-nitro primary arylamine | A positional isomer, also a classic azoic diazo component — see its product page. |
| 2,5-Dichloro-4-Nitroaniline | 6627-34-5 | Dichloro mono-nitro primary arylamine | A dichlorinated diazo component — see its product page. |
| 6-Chloro-2,4-Dinitroaniline | 3531-19-9 | Mono-chloro di-nitro primary arylamine | A more heavily deactivated diazo-component building block — see its product page. |
Exact physical constants and purity specifications are confirmed per batch on the certificate of analysis — treat the notes above as a sourcing guide, not a specification sheet, for products other than Para Chloro Ortho Nitro Aniline.
Safety classification at a glance
Based on GHS classification as commonly listed for this substance. This is a summary for orientation only — always work from the current safety data sheet supplied with your specific batch.
Fatal if swallowed, in contact with skin or if inhaled.
Causes skin irritation.
Causes serious eye irritation.
Suspected of causing genetic defects.
May cause damage to organs through prolonged or repeated exposure.
Toxic to aquatic life, with long-lasting effects.
Significantly more acutely toxic than many chloronitroanilines — treat as a high-hazard material by default.
Danger — GHS06 toxic, GHS08 health hazard and GHS09 environmental pictograms commonly apply.
This grade carries a notably severe acute-toxicity classification. Use impervious gloves, full eye/face protection, and respiratory protection sized to the task; avoid any skin contact and work under local exhaust ventilation. Full first-aid, storage, spill and PPE guidance is in the MSDS issued with every shipment, and should be read in full before this material is handled.
Keeping it on spec between delivery and use
General storage guidance for this grade. Site-specific storage rules, segregation requirements and re-test intervals should follow your own EHS procedures and the MSDS issued with your batch.
Store in a dry, well-ventilated area out of direct sunlight, in tightly closed original packaging, segregated from strong oxidizing and reducing materials and away from general traffic given its acute-toxicity classification. Once opened, reseal promptly to limit moisture pickup and dust generation. If a batch is held past its retest date, re-check assay and colour before it goes into a process.
How it ships from Indonesia
Standard packing and export terms for this product. Confirm exact figures against your order — they vary slightly by destination and quantity.
What travels with every batch
Specification is agreed before the purchase order, not discovered on arrival. Every shipment of Para Chloro Ortho Nitro Aniline leaves with a documented, checkable paper trail.
Certificate of Analysis
Batch-wise assay (by HPLC/GC), melting point range, colour and moisture, issued against the agreed specification so your QC team can check it, not just file it.
Safety Data Sheet
GHS-format SDS in English covering hazard classification, handling, storage, first-aid and spill response for the exact grade shipped.
Technical Data Sheet
Reference physical and chemical properties, recommended storage and typical applications, for internal circulation to your process or R&D teams.
Certificate of Origin
Confirms Indonesian origin for customs clearance and any preferential-duty claim at your destination port.
Dangerous Goods Declaration
UN packing group, classification and shipper's declaration prepared ahead of loading so documentation never holds up customs.
Third-Party Inspection
Independent pre-shipment inspection and re-sampling can be arranged on request, at your cost, for buyers who require it as a matter of policy.
Frequently asked questions
What buyers most often ask our sales desk about this grade.
01What is Para Chloro Ortho Nitro Aniline used for?+
02What is the CAS number of Para Chloro Ortho Nitro Aniline?+
03What purity grades does Chelora Chemicals supply?+
04Is Para Chloro Ortho Nitro Aniline hazardous?+
05Why is this compound called PCONA or Fast Red 3GL Base?+
06What packing options are available?+
07How long does delivery take?+
08Can I get a sample before placing a bulk order?+
09Do you supply other chloronitroanilines?+
10How is Para Chloro Ortho Nitro Aniline manufactured?+
Need Para Chloro Ortho Nitro Aniline on spec, on time?
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