N
X
C
O
N
S
Hal
Solvents
Natural
Products
P Si
C
C
C C
C
C
312
7 IR
At lower frequency if conjugated with:
C=C
≈1650
≈1600
≈1630
C– – – C
≈1600
≈1640
C– – – N
≈1620
O
≈1640
C=O
≈1630
Examples (v ~ in cm -1 )
1645
994
912
1647
889
669
1682
972
963
1670
968
1650
709
1667
825
Cl
Cl
1575
826
761
Cl
Cl
1595
848
714
Cl
Cl
Cl
1587
929
835
780
O
neat:
1610
987
810
CCl 4 :
1634
1608
964
943
O
1655
1592
958
793
O
1670
1652
937
925
O
1663
O
1660
O
1673
O
1663
N
1628
N
1650
N
1640
N
1662
X
C
O
N
S
Hal
Solvents
Natural
Products
P Si
C
C
C C
C
C
312
7 IR
At lower frequency if conjugated with:
C=C
≈1650
≈1600
≈1630
C– – – C
≈1600
≈1640
C– – – N
≈1620
O
≈1640
C=O
≈1630
Examples (v ~ in cm -1 )
1645
994
912
1647
889
669
1682
972
963
1670
968
1650
709
1667
825
Cl
Cl
1575
826
761
Cl
Cl
1595
848
714
Cl
Cl
Cl
1587
929
835
780
O
neat:
1610
987
810
CCl 4 :
1634
1608
964
943
O
1655
1592
958
793
O
1670
1652
937
925
O
1663
O
1660
O
1673
O
1663
N
1628
N
1650
N
1640
N
1662