5-Chloro-2-methylaniline Fast Red KD Base · CAS 95-79-4
Chelora Chemicals is a supplier of 5-Chloro-2-methylaniline, the chlorotoluidine long used as a diazo component in azo pigment and azoic dyeing chemistry under the name Fast Red KD Base. The 5-chloro, 2-methyl arrangement is what sets the shade. Every consignment leaves with a batch-specific COA and the current SDS.
Also known as: Fast Red KD Base, 5-Chloro-o-toluidine, 4-Chloro-2-aminotoluene, 2-Amino-4-chlorotoluene, 5-Chloro-2-methylbenzenamine
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Price, lead time and a sample COA for 5-Chloro-2-methylaniline, usually within one working day. We ship worldwide.
Request a Quote Email the DeskDocumentation
- Batch-specific COA (assay, colour, isomer purity)
- Safety Data Sheet (SDS)
- UN 2239/3429 dangerous-goods transport documents
- Third-party inspection on request
- Certificate of origin
What is 5-Chloro-2-methylaniline?
5-Chloro-2-methylaniline is an aniline with a methyl group at the 2-position and a chlorine at the 5-position, formula C₇H₈ClN. It melts just above room temperature, so depending on the season and the warehouse it arrives as a soft solid or as a brown liquid.
In the colour industry it has been known for decades as Fast Red KD Base. That name tells you exactly what it does: it is diazotised and coupled onto a naphthol to produce a red azo colourant, and the 5-chloro, 2-methyl substitution is what fixes the shade and the fastness properties of the result.
The ortho methyl also matters mechanically. It crowds the amine, which affects how the diazonium salt forms and how stable it is — a detail dyehouse chemists know well and new buyers sometimes discover the hard way.
Handling follows standard precautions for a chlorinated aniline. Chemical-resistant gloves, eye protection, good ventilation and storage away from strong oxidisers.
Why 5-Chloro-2-methylaniline specifically
- An established diazo component. Decades of use as Fast Red KD Base means the shade and behaviour are well characterised.
- Shade-defining substitution. Chlorine at the 5-position and methyl at the 2-position set the colour of the coupled product.
- Pigment and dye versatility. Used in both azoic dyeing and insoluble azo pigment manufacture.
- Distinct from the other chlorotoluidines. The 3-chloro isomer gives different chemistry and a different shade.
How 5-Chloro-2-methylaniline is Manufactured
The commercial route reduces the corresponding chloronitrotoluene, which is where the substitution pattern is actually decided.
- Nitro reduction. The corresponding chloronitrotoluene is reduced, typically by catalytic hydrogenation under controlled conditions.
- Workup. The crude aniline is separated from catalyst and reaction by-products.
- Purification. The product is distilled to the target assay, with isomeric chlorotoluidines removed as far as the specification requires.
- Quality release and packing. Assay, colour and isomer purity are confirmed before the batch is packed and released, typically under nitrogen to limit oxidation.
Typical Commercial Specification
Figures below are representative of commercial-grade 5-chloro-2-methylaniline. Tell us your downstream route and the grade you need, and we will advise on the specification to order against.
| Parameter | Typical Value |
|---|---|
| Appearance | Off-white to brown low-melting solid or liquid |
| 5-Chloro-2-methylaniline content | 99% min by GC assay |
| Isomer purity | Other chlorotoluidines, trace levels to grade |
| Melting range | About 26 – 29 °C |
| Colour | To grade; freshness indicator ahead of use |
Physical & Chemical Properties
| Property | Value |
|---|---|
| Chemical formula | C₇H₈ClN |
| Molecular weight | 141.60 g/mol |
| Appearance | Low-melting solid or brown liquid |
| Melting point | About 26 – 29 °C |
| Boiling point | About 237 °C |
| Density | About 1.17 g/mL |
| Solubility | Poorly soluble in water; soluble in acids and common organic solvents |
| Incompatibilities | Strong oxidisers, strong acids |
Behaviour in the process
What colour producers are buying is predictable diazo behaviour:
- Diazotisation. Dissolves in mineral acid and diazotises to the diazonium salt used in azoic and pigment coupling.
- Steric effect of the ortho methyl. The crowded amine affects diazonium formation rate and stability — control temperature carefully.
- Oxidative sensitivity. Darkens on prolonged exposure to air and light; store sealed and preferably under nitrogen.
- Near-ambient melting point. Expect part-liquid drums in warm weather; this is normal rather than a defect.
5-Chloro-2-methylaniline and Related Diazo Components
Choosing between these comes down to the shade you are targeting and the substitution pattern your recipe was built on.
| Material | Substitution | When it is the right choice |
|---|---|---|
| 5-Chloro-2-methylaniline | 5-Cl, 2-CH₃, 1-NH₂ | Fast Red KD Base recipes and matching azo pigment routes |
| 3-Chloro-2-methylaniline | 3-Cl, 2-CH₃, 1-NH₂ | Routes needing the chlorine meta to the amine instead |
| Para Chloro Aniline | 4-Cl, 1-NH₂, no methyl | Recipes where no ring methyl is wanted |
| meta-Chloroaniline | 3-Cl, 1-NH₂, no methyl | Dye and pharma routes built on the plain chloroaniline |
Stated plainly: in colour chemistry the substitution pattern is the shade. Swapping isomers to save money on a lot will cost you far more in off-shade product.
Industries We Supply 5-Chloro-2-methylaniline To
The same diazo component feeds a pigment plant and a textile dyeing operation. What changes is the form, the impurity tolerance and the documentation each requires.
Where 5-Chloro-2-methylaniline is Used
In downstream functionalisation
In the dominant application, the amine is dissolved in mineral acid, diazotised with nitrite at low temperature, and coupled onto a naphthol or acetoacetanilide to give the azo colourant. Every part of the substitution pattern shows up in the finished shade, which is why colour houses specify both the assay and the isomer profile rather than assay alone.
Need a specific purity grade?
Tell us the purity grade you need, your downstream chemistry, the packing format you can receive and the annual quantity. We will come back with a price, a lead time and a sample COA.
Quality Control & Testing
Every lot is released against a batch-specific Certificate of Analysis, with isomer purity reported alongside the main assay because chlorotoluidine carryover shows up directly in the finished shade.
- 5-Chloro-2-methylaniline content — by GC assay, the primary grade measure.
- Isomer purity — other chlorotoluidines, reported because they shift the colour of the coupled product.
- Colour — reported because oxidation darkens anilines over time.
- Melting range — a practical purity check given the narrow near-ambient melting point.
Common Process Problems & Likely Causes
| Symptom | Likely cause | What to check |
|---|---|---|
| Off-shade or dull colour | Isomeric chlorotoluidine carryover | Isomer purity figure on the COA |
| Unstable diazonium salt | Temperature drift or excess nitrite | Diazotisation temperature control and acid strength |
| Darkened material on receipt | Oxidation during storage or transit | Colour and age of the lot; nitrogen blanket on the drum |
| Material liquid on arrival | Ambient temperature above the melting range | Normal for this product — confirm assay rather than rejecting on appearance |
Packaging, Storage & Shipping
- Standard packing. Drums or jerricans, typically 25 – 200 kg net, with larger bulk formats on contract supply.
- Oxidation protection. Store under nitrogen where possible and keep containers tightly sealed to limit darkening.
- Temperature control. Cool, dry and well ventilated, away from direct sun and heat — note the melting point sits near ambient.
- Material compatibility. Avoid contact with strong oxidisers and strong acids in storage.
- Transport classification. Commonly shipped under UN 2239 or UN 3429, Class 6.1 — confirm against your own current SDS before shipping.
Hazards & Safe Handling
5-Chloro-2-methylaniline is toxic if swallowed, in contact with skin or if inhaled, and is harmful to aquatic life. Standard precautions for a chlorinated aniline and good laboratory and plant practice apply throughout handling.
- Skin and eye contact. Chemical-resistant gloves and goggles are standard practice; anilines are absorbed through skin, so splash protection matters.
- Inhalation. Use adequate ventilation when handling and during melting or transfer operations.
- PPE. Chemical-resistant gloves, safety goggles and, where vapour exposure is a concern, a suitable respirator.
- Environment. Harmful to aquatic life; avoid uncontrolled release to water and follow local effluent rules, which matters especially in dyehouse settings.
Regulatory & Compliance Notes
5-Chloro-2-methylaniline is a registered specialty chlorotoluidine with a long history in the colour industry. Because obligations differ by territory and use, the notes below are orientation rather than legal advice.
- GHS classification. Classified as toxic if swallowed, in contact with skin or if inhaled, and harmful to aquatic life (Signal word: Danger); the SDS carries the full hazard statements for your grade.
- Textile and consumer-goods rules. Aromatic amines used in azo colourants are subject to restrictions in several territories. Confirm the position for your end use and market before specifying this material.
- Dangerous goods transport. Commonly shipped under UN 2239 or UN 3429, Class 6.1. Confirm the correct entry and packing group with your logistics/EHS team against your current SDS.
- HS code. Commonly declared under the aromatic amine derivatives headings; confirm the exact tariff line with your customs broker for your jurisdiction.
We Supply 5-Chloro-2-methylaniline Worldwide
Chelora Chemicals is a supplier and export partner, not a single-plant trader. We ship 5-Chloro-2-methylaniline from India and from partner sources to customers across Asia, Europe, the Middle East, Africa, and North and South America, handling the export documentation and freight so the material arrives ready to use.
- Incoterms. EXW, FOB, CIF, CFR and DAP quoted to suit your purchasing terms and freight arrangements.
- Ports. Regular shipments through Nhava Sheva (JNPT) and Mundra, with other ports arranged as routing allows.
- Documentation. Commercial invoice, packing list, certificate of origin, COA and SDS issued as a complete set.
- Flexible volumes. From trial quantities up to repeat bulk shipments on a supply contract.
Buying 5-Chloro-2-methylaniline from Chelora
We are an independent sourcing and supply partner. For this product that means settling three things at enquiry: the purity and isomer-purity grade your shade requires, the packing format given the near-ambient melting point, and the quantity you are buying.
- Documentation on every lot. Batch-specific COA with assay and isomer breakdown, plus the current SDS.
- Analysis before commitment. Representative analysis shared ahead of a commercial order so your lab can run a shade trial.
- Quantities. Trial quantities through to larger bulk shipments on contract supply.
- Inspection. Independent third-party inspection available at loading when the contract requires it.
- Related toluidines. 3-Chloro-2-methylaniline and other chlorinated anilines alongside this product from one supplier.
How ordering works
- Send the enquiry. Purity, isomer-purity grade, quantity, destination port and the Incoterm you buy on.
- We quote. Price, lead time, packing format and a sample COA, normally within one working day.
- Qualify the supply. For first orders or colour-critical applications, we share the analysis so your technical team can sign off before you commit.
- Confirm the order. Proforma invoice issued; payment terms agreed against the volume and the relationship.
- Ship and document. Packed, labelled and loaded with the full export document set, and tracked through to arrival.
5-Chloro-2-methylaniline — Common Questions
The questions our technical desk is asked most often about 5-Chloro-2-methylaniline. If yours isn't here, call or email and you will reach someone who knows the chemistry.
What is the CAS number of 5-Chloro-2-methylaniline?
The CAS number for 5-Chloro-2-methylaniline (Fast Red KD Base) is 95-79-4, and its EC number is 202-446-4. Its molecular formula is C₇H₈ClN with a molecular weight of 141.60 g/mol.
What is 5-Chloro-2-methylaniline used for?
Mainly as a diazo component in azo pigment manufacture and azoic dyeing, where it is known as Fast Red KD Base. It also serves as an intermediate in agrochemical and fine-chemical synthesis.
What does "Fast Red KD Base" mean?
It is the traditional colour-industry name for this amine when used as a fast base — diazotised and coupled onto a naphthol to produce wash-fast red shades.
How does it differ from 3-chloro-2-methylaniline?
The chlorine sits at the 5-position rather than the 3-position. That changes the reactivity and, in colour applications, the shade of the coupled product. They are not interchangeable.
How is 5-Chloro-2-methylaniline manufactured?
By reducing the corresponding chloronitrotoluene, typically by catalytic hydrogenation, then purifying the resulting aniline by distillation.
Is 5-Chloro-2-methylaniline hazardous?
It is toxic if swallowed, in contact with skin or if inhaled, and is harmful to aquatic life. Refer to the current SDS for your grade for the complete hazard classification.
What is the UN number and transport classification?
Chlorotoluidines are commonly shipped under UN 2239 (solid) or UN 3429 (liquid), both Class 6.1. Because this isomer melts near ambient temperature, confirm the applicable entry against your own current SDS before shipping.
What are the melting point, boiling point and density?
Typical figures are a melting point around 26 – 29 °C, a boiling point around 237 °C, and a density around 1.17 g/mL. Confirm against your own supplier's COA for batch-specific figures.
Why did my drum arrive as a liquid?
Because the melting point sits just above room temperature. Material that is liquid or part-liquid on arrival in warm weather is normal — judge the lot on its assay, not its physical state.
How should 5-Chloro-2-methylaniline be stored?
In sealed containers, ideally under nitrogen, cool, dry and away from direct sun, heat, ignition sources and strong oxidisers.
What purity grades do you offer?
Standard commercial grade is 99% minimum by GC assay, with isomer purity against other chlorotoluidines, colour and melting range reported on the COA.
What packing sizes and order quantities are available?
Drums or jerricans, typically 25–200 kg net, with larger bulk formats available on contract supply. Orders run from trial quantities up to repeat bulk loads.
Ready to source 5-Chloro-2-methylaniline?
Send us your purity requirement and annual volume. You will get a price, a realistic lead time and a sample COA from someone who understands what the material has to do in your process — delivered anywhere in the world.