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CH 14-3: Unknown Analysis of Benzene

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1 CH 14-3: Unknown Analysis of Benzene
Hydrogen Deficiency: Any HD >8 indicates a benzene ring IR: weak bands known as “overtones” are sometimes observed between 2000 – 1665 cm-1. Not reliable!!! C7H8 HD=8

2 1H NMR Analysis of Benzene
1H NMR: signals have a diagnostic chemical shift, 7-8 ppm. Ignore splitting pattern. 3H C8H7Br HD=11 4H

3 13C NMR Analysis of Benzene
13C NMR: Aromatic carbons appear between ppm. The number of signals helps describe the pattern of ring substitution (o, m, p).

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