One of my compounds, after synthesis, was washed with methanol. When I tried to spot it on a TLC plate, the methanol part (which had some residues in it) solidified/formed a precipitate in the capillary tube.
After this when I rotary evaporated the methanol it didn't form any solid/precipitate.
Why did either of these things happen?
Chen Jingwen
The reason why the methanol part solidified/formed in the capillary tube may be the solvent volatilizes or the high concentration of the product.
After evaporation, the residue may be a mixture, or the melting point of the product may be lower than the evaporation temperature.
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