Infrared Spectroscopy, Example #3

IR Spectrum

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C₇H₈O

From the molecular formula, the compound has "4 degrees of unsaturation" (four double bonds, carbonyls or rings). The large number suggests the possible presence of an aromatic ring (4 degrees of unsaturation).

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3400-3200 cm^-1:	strong peak indicating OH is present
3100 cm^-1:	weak peak suggesting possible unsaturated CH
2900 cm^-1:	weak peak indicating possible saturated CH
2200 cm^-1:	no unsymmetrical triple bonds
1720 cm^-1:	no carbonyl absorbance
1450-1500 cm^-1:	moderate absorbance bands consistent with aromatic carbon-carbon double bonds

The spectrum seems to be consistent with an alcohol containing both single and double bonds. The large number of degrees of unsaturation suggest the presence of an aromatic ring.

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Structure:

IUPAC Name: benzyl alcohol

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Correlation Table	Common Absorbances	Interpret IR
Give Structure	Next Example	Return to IR Home