iii. Compare the student sample from this year with the 1H/13C NMR student product W11 which is pure (¹H NMR has only a small impurity at 2.3ppm and a bit of water at 1.5 ppm; ¹³C NMR shows no impurities as they are so small they are covered by the noise in the baseline); are there significant side product or impurities in the student sample? Note that the chemical shift of maleic anhydride (not given in the Aldrich spectrum) is 7.048 ppm (¹H-NMR) and 164.58 ppm, 136.76 ppm (¹³C-NMR).

13CNMR of student product W23 Expansion of 120145 ppm region Expansion or 12U143ppm region