hello scientist, i'd like to ask you how to storage pyrazoline compound that were synthesized from chalcone and hydrazine hydrate ? to make it not browning, because at the first day i put it in the freezer, it only has one spot in the KLT (heading), but at the second day, the spot became 2 (the first spot has tail and the second spot has head). thank you.
Rafik Karaman
Dear Rizky,
Pyrazoline derivatives might undergo oxidation to furnish brownish products. To avoid such reaction, you should store the pyrazoline derivative under argon or nitrogen and to cover the container with aluminium foil and to avoid any exposure to light or heat. Temperatures of 0-8 C will be adequate as a storage conditions.
Hoping this will be helpful,
Rafik
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