I tried synthesizing 3-acetyl-8-methoxycoumarin and obtained a compound with melting point range of 206-210 degrees. In the literature, melting point ranges from 171-172 degrees.
I further characterized my compound using FTIR. The peak that I got is not exactly the same with the literature but it's within the range.
So I wonder, since the melting point that I have obtained is higher than the literature's, is my compound can be considered pure?
If it is, what may have caused the melting point to increase other than impurities?
Have you run an NMR?
You may have a different crystal form but this seems unlikely given literature melting point values are consistently between 165-176 °C.
It may also be worth recrystallising the compound (again) and seeing if this affects the melting point.
They may be same compound but different polymorph which have different physical characterization.
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