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NUCLEAR MAGNETIC RESONANCE AND MASS SPECTROMETRY 171
The peak at m/z 29 arises from a fragmentation producing an acylium ion.
+H O+
m/z 29
O
+
H
9.32
m/z: 144 (100.0%), 145 (10.0%) m/z: 126 (100.0%), 127 (9.9%)
H2O+
m/z: 111 (100.0%), 112 (8.8%)
m/z: 87 (100.0%), 88 (5.6%)
OH
OH
+ +
+
+
9.33
m/z: 100 (100.0%), 101 (6.7%) m/z: 58 (100.0%), 59 (3.4%)
McLafferty rearrangement
+
+
O OH
m/z: 85 (100.0%), 86 (5.5%)
O
m/z: 43 (100.0%), 44 (2.2%)
O
+ +