⇒Topics covered: Amine quality traps. Storage and stability issues for 2-Tert-Butylaniline. What a proper CoA looks like. How to source reliably from China. sdlookchem’s capabilities.
A process chemist in South Korea described a frustrating production issue to me. They’d been running a reductive amination using 2-Tert-Butylaniline (CAS 6310-21-0) from the same Chinese supplier for two years without problems. Then one batch gave them a yield drop of almost 15%. Nothing had changed in the process.
After extensive testing they found the amine had partially oxidized in transit — probably due to a seal failure on the drum. The purity on the CoA was correct when the material shipped. By the time it arrived, the effective concentration had dropped.
The supplier offered a replacement. But the lost production time was already gone.
Amines as a class are more sensitive to storage conditions than most buyers account for. 2-Tert-Butylaniline in particular has a shelf life that depends heavily on whether the container is truly sealed after each use.
Moisture can cause hydrolysis. Oxygen causes oxidation and discoloration. Both lead to yield loss and unexpected byproducts. If you’re buying in bulk and resealing containers between uses, you should be running an assay on the material periodically — not just trusting the original CoA.
Most buyers don’t do this. Most buyers are fine. Some aren’t, and when they’re not, it’s expensive.
For 2-Tert-Butylaniline, the relevant purity metrics are: GC purity (for volatile amines), HPLC purity (for heavier ones), water content by Karl Fischer, and color by APHA. Don’t accept a CoA that only gives you one of these.
Related amines — structural isomers — are the most common impurities. Ask specifically about them. A supplier who can give you an impurity profile by name is better than one who gives you a single purity number.