MS fragmentation patterns, Apuntes de Química

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A-42 Appendix 13 APPENDIX 13 A Handy-Dandy Guide to Mass Spectral Fragmentation Patterns Alkanes Alkenes Good M* 14-amu fragments Distinct M* Loss of 15, 29, 43, and so on Cycloalkanes Aromatics Halídes Alcohols Strong M* Loss of CH2>=CH> M-28 Loss of alkyl Strong M* CH? mle=91, weak mie =65 (CsHs*) CH, Cía mie = 92 Transfer of gamma hydrogens H Cl and Br doublets (M'* and M +2) mle=490r51 CH¿=CP mle=930r95 CH,=Br* M-36 Loss of HCl mie =91 or 93 Ci mle=1350r 137 _Bri O M-79(M-81) Loss of Br- M- 127 Loss of I M? weak or absent Loss of alkyl CH,>0H* mle=31 RCH-=0H* m/e=45,59,73,... RICOH” mie=59,73,87,... M-183 Loss of H20 M-46 Loss of H20 + CH,=CHz