CH 14-3: Unknown Analysis of Benzene

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Presentation transcript:

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

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

13C NMR Analysis of Benzene 13C NMR: Aromatic carbons appear between 100-170 ppm. The number of signals helps describe the pattern of ring substitution (o, m, p).