N
X
C
Hal
O
N
S
P Si
Natural
Products
Solvents
C
C
C
C C
C
361
7.11 Carbonyl Compounds
361
O
O
O
1859
1789
O
O
O
1845
1780
O
O
O
1850
1800
900
O
O
O
1840
1810
1760
912
O
O
O
1802
1761
O
O
O
1802
1761
7.11.7 Acid Halides
Typical Ranges (v ~ in cm -1 )
Assignment
Range
Comments
C=O st
1820–1750
Chlorides, strong; in Raman, weak to medium.
Of narrow or medium width, for bromides
and iodides at lower wavenumber. Additional
band at ≈1725 in aromatic acid chlorides and
bromides
1900–1870
Fluorides, strong, of narrow or medium width
C–CO st
1000–800
1000–900 aliphatic, assignment uncertain
900–800 aromatic, assignment uncertain
C–hal st
1200–500
1200–800 F
750–550 Cl
700–500 Br
600–500 I
C–C= st
%T
400
800
1200
1600
2000
2800
3600
C=O st
C–hal st