Structure Elucidation by Modern NMR: A Workbook by Prof. Dr. H. Duddeck, Dr. W. Dietrich (auth.)

By Prof. Dr. H. Duddeck, Dr. W. Dietrich (auth.)

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If such signals are out of range of the H,C COSY spectrum, they, of course, do not appear in the 13C NMR spectrum at the top of H,C COSY either. In such case their chemical shifts are noted in the captions with an additional note "C". 30 3. Exercises In the figures a 1H NMR spectrum may be divided into several fractions for the sake of better recognition. The fractions always have the same chemical shift (in hertz/centimeters) and intensity scale. Thus, coupling constants can easily be determined (1 ppm corresponds to 400 Hz), and their splittings and intensities compared within different fractions.

1 Fig. 1. 0 IH NMR spectrum of 13. 7 55 3. I 1 I 30 25 I 20 I 15 I 10 I 5 I 3000 I 2500 I 2000 I 1500 I 1000 I 500 HERTZ Fig. 2. 10 is irradiated. ,,= 56 3. Exercises . 8 " _ 1. 4 _ 1. ~. 2 Fig. 3. 0 H,H COSY spectrum of 13. 8 I • 13 57 3. Exercise 7 I 25 Fig. 4. H,C COSY and DEPT spectra of 13. I 20 I 15 I 10 5 58 3. , a plant growing in Spain. The compound (14) has the molecular formula C 1o H I4 0. What is its structure? Assign all IH and 13C signals. 1. IH NMR spectrum of 14; the signal at 0 corresponds to three hydrogens.

4. H,C COSY and DEPT spectra of 13. I 20 I 15 I 10 5 58 3. , a plant growing in Spain. The compound (14) has the molecular formula C 1o H I4 0. What is its structure? Assign all IH and 13C signals. 1. IH NMR spectrum of 14; the signal at 0 corresponds to three hydrogens.

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