Dye & benzimidazole intermediate
Ortho Nitro Aniline (2-Nitroaniline) Supplier & Distributor in India & Worldwide
Chelora Agrochem is a trusted Ortho Nitro Aniline (ONA) supplier and distributor in India, connecting buyers with high-purity material sourced from leading, quality-approved manufacturers. Our 2-Nitroaniline meets 99% min purity with consistent quality, full documentation and reliable bulk supply across India and to buyers worldwide.
As a specialised distributor of chemical products, we do not manufacture in-house — instead we source only from reliable, audited manufacturers, giving you dependable material, competitive pricing and a single point of contact for all your ONA requirements, backed by COA, MSDS and TDS on every order.
- CAS number
- 88-74-4
- Formula
- C6H6N2O2
- Molecular weight
- 138.12 g/mol
- Purity
- 99% min
Quick product specifications
Ortho Nitro Aniline at a glance
Identifiers, physical data and trade codes for ONA. Batch-specific figures are confirmed on the Certificate of Analysis supplied with each consignment, in India and on export shipments alike.
- Chemical name
- 2-Nitroaniline
- CAS number
- 88-74-4
- Molecular formula
- C6H6N2O2
- Molecular weight
- 138.12 g/mol
- IUPAC name
- 2-Nitroaniline
- Colour Index
- C.I. 37025
- HS code
- 2921 42 90
- UN number
- UN 1661Nitroanilines, solid — class 6.1
- Appearance
- Orange to yellow crystalline solidAlso supplied as powder or flakes
- Melting point
- 71–73 °C
- Boiling point
- 284 °C
- Density
- 1.44 g/cm3
- Flash point
- 168 °C
- Solubility
- Slightly soluble in water0.12 g/100 mL at 20 °C; soluble in alcohol and organic solvents
- Purity
- 99% min
- Moisture
- 0.5% max
- Synonyms
- ONAo-Nitroaniline · 1-Amino-2-nitrobenzene · 2-Nitrobenzenamine
- Product form
- Solid — bags, drums
- Documentation
- COA, MSDS & TDSSupplied with every order
Product overview
What is Ortho Nitro Aniline?
Ortho Nitro Aniline (2-nitroaniline, ONA) is an orange-yellow aromatic nitro amine used mainly as a dyestuff intermediate and as the principal precursor to o-phenylenediamine, which in turn becomes the benzimidazole ring found in fungicides, anthelmintics and rubber chemicals.
With the formula C6H6N2O2 (CAS 88-74-4), ONA is a crystalline solid made commercially by reacting 2-chloronitrobenzene with excess aqueous ammonia in an autoclave. The reaction is strongly exothermic, so it is run under close temperature control at around 180 °C and roughly 4 MPa.
Because the amino group sits next to an electron-withdrawing nitro group, ONA diazotises to a stable diazonium salt and reduces cleanly to the diamine — the two reactions that account for almost all of its industrial consumption.
How it is made
2-Chloronitrobenzene is heated with a large excess of strong aqueous ammonia in an autoclave, the temperature raised to about 180 °C, and the product filtered and washed after the ammonia is recovered.
What that means for your process
- Reactive amino group for diazotisation and coupling
- Nitro group available for clean catalytic reduction to the diamine
- Isomer and residual chloronitrobenzene controlled to grade, checked by GC
- Low moisture (0.5% max) for stable storage and handling
Applications
What is Ortho Nitro Aniline used for?
ONA is used almost entirely as a chemical intermediate. Its main applications, industry by industry, include:
Dyes & pigments
A classic dyestuff intermediate, listed in the Colour Index as C.I. 37025 and used as a diazo component.
- Diazo component for azoic and azo dyes
- Intermediate for pigment and dye bases
- Used in orange and red shade ranges
o-Phenylenediamine & benzimidazoles
The largest single outlet. Reduction gives o-phenylenediamine, the gateway to the benzimidazole ring.
- Precursor to o-phenylenediamine (OPDA)
- Route to benzimidazole fungicides and anthelmintics
- Used for rubber accelerators and antioxidants
Agrochemicals & fine chemicals
Feeds crop-protection and fine-chemical synthesis through the diamine and through direct derivatisation.
- Intermediate for selected fungicides
- Building block for fine chemicals and custom synthesis
Process route
How is Ortho Nitro Aniline used downstream?
The dominant route reduces the nitro group to give o-phenylenediamine, which is then cyclised into the benzimidazole ring used across fungicides, anthelmintics and rubber chemicals. In the colourant route, the same molecule is instead diazotised and coupled to build azo dyes.
Ortho Nitro Aniline
Charged as the nitroaniline. Assay and isomer profile decide downstream colour and yield.
C6H6N2O2Catalytic reduction
The nitro group is hydrogenated to an amine over a supported metal catalyst.
H2 / catalysto-Phenylenediamine
The 1,2-diamine — the ring-closure partner for the whole benzimidazole family.
OPDABenzimidazole actives
Cyclised and finished into fungicides, anthelmintics and rubber chemicals.
BenzimidazolesIn depth
Ortho Nitro Aniline applications by industry
Below is a detailed breakdown of where ONA is used and the role it plays in each downstream product.
| Industry | Typical downstream products | Role of ONA |
|---|---|---|
| Dyes & pigments | Azo and azoic dyes, dye bases | Diazo component |
| Pharmaceuticals | Benzimidazole actives via OPDA | Core intermediate |
| Agrochemicals | Benzimidazole fungicides | Intermediate via OPDA |
| Rubber chemicals | Accelerators and antioxidants | Precursor |
| Fine chemicals | Custom molecules | Building block |
Safety
Is Ortho Nitro Aniline hazardous?
Yes. 2-Nitroaniline is toxic if swallowed, in contact with skin or if inhaled, may cause organ damage through prolonged or repeated exposure, and is harmful to aquatic life with long-lasting effects. Like other nitroanilines it can cause methaemoglobinaemia, so skin and respiratory protection matter. With correct PPE, ventilation and containment it is safely handled in industry.
ONA should be stored in sealed containers in a cool, dry, ventilated place away from heat, strong acids and oxidisers — it reacts vigorously with concentrated sulfuric acid at high temperature and emits nitrogen oxides on decomposition. Prevent release to drains and waterways. A full MSDS is supplied with every order.
Signal word: Danger
Toxic by ingestion, skin contact and inhalation · organ damage on repeated exposure
Safe-handling essentials
- Gloves, goggles and respiratory protection at all times
- Work with local exhaust ventilation; avoid dust generation
- Skin absorption is a real route — change contaminated clothing at once
- Keep containers sealed, cool, dry and out of direct light
- Store away from heat, strong acids and oxidisers
- Never allow release to drains, soil or waterways
- Transport as UN 1661 — a regulated dangerous good
Grades
Ortho Nitro Aniline grades & technical specifications
We supply ONA in commercial grades to match dye, pharmaceutical and agrochemical requirements.
| Parameter | Specification |
|---|---|
| Assay (purity) | 99% min |
| Appearance | Orange to yellow crystalline solid / powder |
| Melting point | 71–73 °C |
| Moisture | 0.5% max |
| Isomer purity | As per grade |
| Residual chloronitrobenzene | As per grade |
| Product form | Solid — bags, drums |
Note: Values are representative. Batch-specific figures are provided on the Certificate of Analysis (COA) supplied with each consignment.
Supply
Packaging, MOQ & supply
From trial quantities for process validation to repeat container loads on contract — packed, documented and dispatched to your plant in India or overseas.
Packaging
25/50 kg bags, fibre or MS drums with liners, as per grade and quantity.
Minimum order quantity
Flexible — trial quantities through to full-container bulk loads.
Shelf life
Long shelf life when stored sealed, cool, dry and away from heat, light and oxidisers.
Dispatch
Pan-India dispatch and worldwide export with complete documentation and logistics support.
Why buy from us
Why choose Chelora as your ONA supplier?
As an established Ortho Nitro Aniline supplier and distributor based in India and shipping worldwide, we work with a wide network of trusted manufacturers to combine consistent quality with dependable service. More about Chelora Agrochem.
High purity, every batch
99% min assay, sourced only from quality-approved manufacturers we have worked with and audited.
Full documentation
COA, MSDS and TDS travel with every order, so your QA and EHS teams are never chasing paperwork.
Reliable bulk supply, flexible MOQ
Trial packs for process trials through to repeat container loads on schedule.
Worldwide supply
Export-grade packing, documentation and on-time dispatch to plants across Asia, the Middle East, Europe, Africa and the Americas.
Technical & safe-handling support
Guidance on storage, PPE and process fit from a team that knows nitroaromatics.
One point of contact
Source ONA alongside your other intermediates — one enquiry, one team, one invoice.
Ordering
How to order Ortho Nitro Aniline from Chelora
Ordering is simple and fast — most enquiries are answered with pricing and availability within 24 hours.
- 1
Send your enquiry
Tell us the grade, quantity and application you are buying for.
- 2
Receive a quotation
We send pricing along with the COA and MSDS for your review.
- 3
Request a sample
Test suitability for your process before you commit to a bulk order.
- 4
Confirm the order
Lock in quantity, packaging and delivery preference.
- 5
Dispatch & tracking
We dispatch with full documentation and keep you updated until delivery.
Documentation
Ortho Nitro Aniline MSDS & COA
A summary of key safety information and a representative Certificate of Analysis. The complete 16-section Safety Data Sheet and the actual batch COA are supplied with each shipment — and both are sent with your quotation when you ask for a quote.
Safety data summary (MSDS)
| Section | Details |
|---|---|
| Hazard classification | Toxic (oral / dermal / inhalation); organ damage on repeated exposure; harmful to aquatic life |
| Signal word | Danger |
| First aid — inhalation | Move to fresh air; seek medical help |
| First aid — skin | Remove clothing; wash with soap & water |
| First aid — eyes | Rinse with water; get medical advice |
| Handling | Use PPE; avoid dust; ventilate |
| Storage | Cool, dry, sealed; away from heat, acids & oxidisers |
| Decomposition | Emits nitrogen oxides on heating to decomposition |
| Environment | Prevent release to drains / waterways |
| Transport | UN 1661; class 6.1; regulated dangerous good |
Certificate of Analysis (representative)
| Test parameter | Specification | Method |
|---|---|---|
| Assay (purity) | 99% min | GC |
| Appearance | Orange to yellow crystalline solid | Visual |
| Melting point | 71–73 °C | Capillary |
| Moisture | 0.5% max | Karl Fischer |
| Isomer content | As per grade | GC |
The actual batch COA is supplied with each shipment.
FAQ
Frequently asked questions
Common questions from buyers specifying Ortho Nitro Aniline for dye, pharmaceutical and agrochemical production.
What is Ortho Nitro Aniline used for?
ONA is used mainly as a dyestuff intermediate and as the precursor to o-phenylenediamine, which is converted into benzimidazoles used in pharmaceuticals, fungicides and rubber chemicals.
What is the CAS number of Ortho Nitro Aniline?
The CAS number is 88-74-4 and the molecular formula is C6H6N2O2. It is also known as 2-nitroaniline, o-nitroaniline or 1-amino-2-nitrobenzene.
How is Ortho Nitro Aniline manufactured?
By amination of 2-chloronitrobenzene with excess aqueous ammonia in an autoclave at around 180 °C, after which the ammonia is recovered and the product is filtered and washed.
Is Ortho Nitro Aniline hazardous?
Yes, it is toxic by ingestion, skin contact and inhalation and may cause organ damage on repeated exposure. It must be handled with proper PPE, ventilation and containment; we supply a full MSDS with every order.
What is the difference between ortho and para nitroaniline?
Both have the formula C6H6N2O2 but differ in where the nitro group sits. The ortho isomer melts around 71–73 °C and leads to o-phenylenediamine and benzimidazoles; the para isomer melts far higher, near 147 °C, and goes mainly into p-phenylenediamine and azo dyes.
How should ONA be stored?
In sealed bags or drums in a cool, dry, well-ventilated store, away from heat, strong acids and oxidisers, and out of direct light.
Do you provide COA and MSDS for ONA?
Yes, we provide a batch-specific COA and MSDS with every order, plus technical support on request.
Do you supply and export Ortho Nitro Aniline?
Yes, we supply ONA across India and export internationally with complete documentation, sourced from reliable manufacturers.
Request a quote or sample
Need a reliable ONA supplier?
Looking for a dependable Ortho Nitro Aniline (2-nitroaniline) supplier and distributor — in India or anywhere we export to? Tell us the grade and quantity you need — our team responds with competitive bulk pricing, samples and complete documentation (COA, MSDS, TDS) within 24 hours.
Or email source@cheloraagrochem.com