Some peak at 4.8 ppm is not very descriptive. Depends on the solvent. I am guessing it's not CDCl3 and you may have used DCM? What is the splitting, singlet? Is it a broad peak i.e. HDO? What does the concentrated TLC look like? There could be several reasons why. What is your yield? You could deduce what it is if you know the % weight, and things of this nature.