Espectroscopia IR e Espectrometria

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Solutions for Infrared Spectroscopy and Mass Spectrometry
(f)
17 continued
CH3CH2
H2
C
H
N C
CH3
CH3
CH3
57
m/z 115
86
H2C
H
N C
CH3
CH3
CH3
H2C N
H
C
CH3
CH3
CH3
C
CH3
CH3
CH3
m/z 57
m/z 86
(g) C
O
CH3
m/z 120
77
43
105
C
O
C
O plus other resonance 
forms with (+) on ring
C
m/z 77
C
O
CH3 C
O
CH3
m/z 105
m/z 43
These are three alpha-cleavages.
(h)
H3C
C H
C
H2
C
CH3
Br
CH3
H
m/z 164, 166
8543
121,123
C
CH3
H3C m/z 43
H
HC
H2
C
CH3
Br
HC
H2
C
CH3
Br
H3C
C
C
H
H2
C
CH3
CH3
H
m/z 121, 123
m/z 85
Any fragment containing Br will 
reflect the two isotopes of Br with 
approximately 50:50 natural 
abundance.
CH2 H2C
CH3
CH2
H2C
CH2 H2C
m/z 57 mass 57
mass 43m/z 71
mass 29m/z 85
+
+
+
85
71
57
m/z 114
(a)
18
100
CH3CH2
H2
C
H
N C
CH3
CH3
CH3CH2
H2
C N
H
C
CH3
CH3m/z 100
281