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Interpreting Hydrogen NMR

Interpreting Hydrogen NMR. Interpreting NMR Spectra Calculate elements of unsaturation (1/2(2C+2-H), ignore O, halogens count as H’s Count number of signals (equals number of types of H) Check integration to determine ratio of types of H Check splitting to determine connectivity

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Interpreting Hydrogen NMR

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  1. Interpreting Hydrogen NMR

  2. Interpreting NMR Spectra • Calculate elements of unsaturation (1/2(2C+2-H), ignore O, • halogens count as H’s • Count number of signals (equals number of types of H) • Check integration to determine ratio of types of H • Check splitting to determine connectivity • Use chemical shift table to identify types of H • Work out fragments • Assemble fragments, remembering rules of bonding • Check result to make sure it matches formula and number • of types of H.

  3. C3H8 EoU=0 Signal b, 12 units Triplet, 0.91 ppm 2 signals, 2 types of H Ratio is 1:3 or 2:6 a is a septet, so 6 H’s adjacent b is a triplet, so 2 H’s adjacent a is at 1.3 ppm: CH2? b is at 0.9 ppm: CH3? Structure is CH3CH2CH3 Signal a, 4 Units Septet, 1.34 ppm

  4. C4H8O2, EoU=1 3 signals, 3 types of H Ratio is 4:6:6 (or 2:3:3) a is a quartet, adjacent to 3H b is a singlet, adjacent to 0H c is a triplet, adjacent to 2H a at 4.1 ppm, CH2O? b at 2.0 ppm, CH3C=O? c at 1.4 ppm, CH3? Structure is CH3C(O)OCH2CH3 a, quartet 4 units b, singlet 6 units c, triplet 6 units

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