N
X
C
O
N
S
Hal
Solvents
Natural
Products
P Si
C
C
C C
C
C
310
7 IR
7.2 Alkenes
7.2.1 Monoenes
Typical Ranges (v ~ in cm -1 )
Assignment
Range
Comments
=CH 2 st
3095–3075
Medium, often multiple bands
=CH st
3040–3010
Medium, often multiple bands
CH st in aromatic hydrocarbons and three-membered rings fall into the same range
In cyclic compounds:
≈3075
≈3060
≈3045
≈3020
=CH δ ip
1420–1290
Of no practical significance
=CH δ oop
1005–675
A number of bands
In the same range: ar CH δ oop, C–O–C γ, and C–N–C γ in
saturated heterocyclics, OH δ oop in carboxylic
acids, NH γ, NO st, SO st, CH 2 γ, CF st, CCl st
C=C–H δ oop
C–H st
C=C st
%T
400
800
1200
1600
2000
2800
3600
overtone
=CH 2
X
C
O
N
S
Hal
Solvents
Natural
Products
P Si
C
C
C C
C
C
310
7 IR
7.2 Alkenes
7.2.1 Monoenes
Typical Ranges (v ~ in cm -1 )
Assignment
Range
Comments
=CH 2 st
3095–3075
Medium, often multiple bands
=CH st
3040–3010
Medium, often multiple bands
CH st in aromatic hydrocarbons and three-membered rings fall into the same range
In cyclic compounds:
≈3075
≈3060
≈3045
≈3020
=CH δ ip
1420–1290
Of no practical significance
=CH δ oop
1005–675
A number of bands
In the same range: ar CH δ oop, C–O–C γ, and C–N–C γ in
saturated heterocyclics, OH δ oop in carboxylic
acids, NH γ, NO st, SO st, CH 2 γ, CF st, CCl st
C=C–H δ oop
C–H st
C=C st
%T
400
800
1200
1600
2000
2800
3600
overtone
=CH 2