Question

1)

Nuclear magnetic resonance (NMR) spectroscopy can be used to gather information about the structure of a compound. The chemical shift of peaks in a 1H NMR or a 13C NMR spectrum can be used to gather information about the types of neighboring functional groups. The spin-spin splitting pattern in a 1H NMR spectrum can be used to determine the number of hydrogen atoms on neighboring carbon atoms.

The chemical shift (?) of an atom is influenced by the electrons on adjacent atoms. Generally neighboring atoms that are more electronegative push a chemical shift downfield (higher ? value). Atoms that are equivalent due to symmetry will be magnetically equivalent. They will produce a peak at one shift. For 1H NMR spectrum this peak will integrate to the number of hydrogen atoms that are magnetically equivalent in that peak.

Part A

Identify the 13C NMR chemical shift for each carbon atom in a molecule of 1-penten-3-one.

1) Part B

The 1H and 13C NMR spectra of a compound with the molecular formula C4H8O2 are shown below.

19)

Answer 1

200.5 128.5 10.1 32.8 130.3 reset ? help

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