N
X
C
Hal
O
N
S
P Si
Natural
Products
Solvents
C
C
C
C C
C
357
7.11 Carbonyl Compounds
357
7.11.5 Amides and Lactams
Primary Amides
Secondary Amides
Tertiary Amides
Typical Ranges (v ~ in cm -1 )
Assignment
Range
Comments
N–H st
3500–3100
Medium, in primary amides two bands, in proteins multiplet
Subranges:
3500–3400
Free
3350–3100
H-bonded
≈3350, ≈3180 In primary amides generally two bands
≈3200, ≈3100 In lactams generally two bands
≈3200
Monohydrazides
NH 2 st
%T
400
800
1200
1600
2000
2800
3600
C–N st
C=O st
NH 2 δ
NH st
%T
400
800
1200
1600
2000
2800
3600
C=O st
NH δ
%T
400
800
1200
1600
2000
2800
3600
C=O st