Dear Dr's
I prepare Schiff base; firstly lemons color appear, after 4 hrs "i forget it more than 1 hour" the color change to brown; are their a relationship between time and color?
What is the structure of the molecule? Does the Schiff base have free aniline moeity? Aniline may undergo aerial oxidation to brown colour.
Normally no, there is not a relation between time of reaction and colour. But write the formula of your Schiff base.
If the reaction proceeds entirely to the product (100%) I do not see why the colour will change. How reactive is benzocaine with respect to aniline? I feel that reaction is slow and the reactant benzocaine decomposes in solution to brown. In order to test this hypothesis you can do a control study. Add a small amount of benzocaine in the solvent and see whether the colour of the solution changes after few hours. If it turns brown then you know where the problem is. If it does not we have to think in different direction.
Thanks a lot for all of you
the Schiff base crystalline when reflux 2hr's and xray confirm it,
but no crystal when convert to brown but give gum. so may be it decompose or polymerize after convert to ester
thank another time
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