NMR Problems Problem 5: Determine the correct structure from the provided structures and write this structure in the box provided on the NMR spectrum. Students are provided the 'H and C NMR data to use as additional information to solve this problem. CH . NH NG Structure A Structure B Structure C Structure D Draw the correct structure in the provided box for full credit. TT TI HA H HC Ho HE H NMR 6.8 ppm 6.1 ppm 5.9 ppm 3.5 ppm 2.0 ppm Splitting Doublet Doublet Singlet Singlet Singlet Integration 6 6 6 24 18 C13 CA Cc DEPT-135 No signal No signal Positive No signal Positive Positive Positive 146 ppm 145 ppm 131 ppm 113 ppm 106 ppm 102 ppm 102 ppm co HA HE HaHC Ho 3 7 4 3 2 1 9 6 5 11 8 10 7 DO ppm