Does anyone know where the multiplet from 7.45-7.55 with an integration of 1.17
ID: 516134 • Letter: D
Question
Does anyone know where the multiplet from 7.45-7.55 with an integration of 1.17 is coming from?? All of the other peaks have been accounted for on the product (2.39H protons meta to F) (9H bottom two aromatic rings) (2H protons ortho to F). I'm assuming it's from an impurity but I don't know what.
Also, as a side note, does anyone know the integration is showing as 9H for the bottom two aromatic rings since there is only 8 protons? The proton from the OH is further downfield so it's not that.
AT OH MgBr 765 760 755 750 745 740 7.35 7.30 7.25 7.20 7.15 7.10 705 7.000 6.96 6.90 685 6.80 6.75Explanation / Answer
NMR analysis
In the given tertiary alcohol structure,
The protons (CH's) ortho to -F would be appearing at 7.45-7.55 ppm region in the 1H NMR spectrum
the integration of of 9H instead of 8H is due to 8H of ring and 1H of the solvent CHCl3 present in CDCl3.
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