IR Values

Ketone

Ketone

1715

Carboxylic Acid C=O stretch

1730

Carboxylic Acid OH Stretch

2500-3500

Acid Anhydride Symmetric

1820

Acid Anhydride Antisymmetric

1750

Acid Chloride

1750-1820

Amide

1640-1690

Nitro Group Symmetric

1350

Nitro Group Antisymmetric

1530

Alkene

1635-1690

Benzene Ring

1450-1625

Alkyne

2100-2250

Nitrile

2250

C-H of Alkyne

3300

NH2 Symmetric

3300

NH2 Antisymmetric

3400

Secondary Amine

3300

Alcohol (H bonding)

3200-3600, broad

Alcohol (no H bonding)

3600, sharp

Conjugated Ketone

1685 (Ketone - 30)

Give each of the shifts of the carbonyl in a 6, 5, 4 and 3 membered ring

1715, 1745, 1780, 1815 (+ 30, +35, +35)

Aldehyde

1730

Ester

1745