2,6-Diethylaniline

2,6-Diethylaniline carries an ethyl group on each position flanking the amino group. The symmetry matters: with both ortho sites blocked identically, the molecule has no awkward regiochemistry to manage in downstream synthesis, and the steric bulk around the nitrogen is exactly what the chloroacetanilide herbicide class is built around — it shields the eventual amide bond and shapes how the finished molecule binds its biological target.

It is a liquid at ambient temperature, clear when fresh and turning yellow to reddish-brown with exposure to air and light — commercial material is commonly supplied stabilised against this drift. The melting point of 3–4 °C sits close enough to a cool night that drums can partially solidify in transit; this is a handling characteristic rather than a defect. It is only sparingly soluble in water, around 0.67 g/L, and dissolves readily in common organic solvents.

Where it fits in the synthesis chain

This is the highest-volume product in the dialkylaniline family we supply, because it is the shared amine precursor for several large-tonnage chloroacetanilide herbicides at once. The nitrogen is first alkylated or alkoxyalkylated — the specific substituent differs by target herbicide — and the resulting secondary amine is then acylated with chloroacetyl chloride to install the chloroacetamide group that defines the whole herbicide class. Alachlor, acetochlor and butachlor are all reached this way; acetochlor and butachlor currently account for the larger share of demand we see through the export desk.

Grades we supply

Chelora Chemicals offers 2,6-Diethylaniline in technical grade (98%) for standard herbicide-intermediate synthesis and high-purity grade (99%+) where colour or trace isomer content matters to a continuous acylation process. Both ship with a batch-wise certificate of analysis. Confirm your flash point and density requirements at enquiry, since documented supplier SDSs for this material show some spread on both figures — we quote against the specification you need rather than a single house default.

2,6-Diethylaniline is made industrially by the catalytic ortho-dialkylation of aniline itself with ethylene, run under pressure over a solid acid catalyst — typically an alumina or silica-alumina surface. The reaction installs both ethyl groups directly onto the ring in the positions flanking the existing amino group, without needing a separate nitration-and-reduction sequence.

An older and less common route nitrates the corresponding 1,3-diethylbenzene and reduces the nitro group to the amine, following the pattern used for the monochloroanilines elsewhere in our range. Direct catalytic ortho-ethylation of aniline is the dominant modern commercial process, and it is the route that gives consistent isomer purity without a difficult separation step.

After alkylation the crude amine is washed and distilled to remove unreacted aniline, mono-ethylated by-product and catalyst residues. The distillation cut is where technical and high-purity grades diverge, and it is also where colour stability is set — material cut too close to its decomposition point darkens faster in storage.

Why ortho-dialkylation beats nitration here

Nitrating 1,3-diethylbenzene would give a mixture of nitro isomers that is genuinely difficult to separate cleanly, since the two ethyl groups direct the incoming nitro group to more than one position. Building the molecule the other way around — alkylating aniline directly, where the amino group itself directs the ethyl groups to the two ortho positions — sidesteps that separation problem entirely. This is why ortho-dialkylation of aniline, not nitro-reduction, is the commercial route for every compound in this family.