How would using IR spectroscopy verify that a compound is oxidized. The compound is 2-heptonal . What IR bands would I l...

Question

Question

How would using IR spectroscopy verify that a compound is oxidized. The compound is 2-heptonal . What IR bands would I look for?

Answer 1

Answer #1

Alcohols and phenols will show a strong and broad hydrogen-bonded O-H stretching bands centered between 3400 and 3300 cm-1. If the O-H group is not hydrogen -bonded i. e. "free" then it will give a sharp peak at 3600 cm-1. This band appears in combination with the hydrogen-bonded O-H peak when the alcohol is dissolved in a solvent.
Ketones show a very strong band for the C=O group that appears in the range 1720-1708 cm-1 for the simple aliphatic ketones. A very weak overtone band from the C=O appears around 3400 cm-1. Small bands of this type should not be confused with O-H absorptions, which also appears near this values. The O-H stretching absorptions are much more intense.
To conclude, if the compound is oxidised then check for the C=O group. The C=O group gives rise to a strong absorption in the region 1700 cm-1. The peak is often the strongest in the spectrum and of medium width. You can't miss it..!!
If C=O is absent then check for O-H band which gives a broad absorption near 3400-3300 cm-1. Confirm this by finding C-O near 1300-1000 cm-1.

Answer 2

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