i am try to synthesize the schiff base compound from aniline derivatives and vanillin use ethanol as a solvent and i am try first without catalyst no precipitate form then i use glacial acetic acid also no precipitate form but when i use sodium hydroxide as catalyst the yellow -white precipitate form with deffer melting point than reactant but when i mentoring by TLC the spot appear in vanillin and the elemental analysis of C,H,N give result deffer from my product can you help me ?
Salma Babikir! Use methanol as a solvent. With NaOH, you can get the yellow crystals that is your product. Recrystalize your product, then check TLC/FTIR/NMR; you will find the product only.
Qasim Qayyum Kashif thank you i am using it but give me yellow white precipitate but when i check with TLC now spot appear for the product and also when i use the elemental analyzer the percentage for C,N.H its far away from the theoretical
Salma Babikir There are a couple of think you should be careful about; first try to minimize human error, you weight of the sample, and theoretical calculations should be very accurate. Then make sure the complete combustion of the sample, if you still see the error in elemental analysis then the sample is impure. Impurities result in incorrect percentages of C, N, and H.
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