From Mass Spectrometry: A Foundation Course

Compound class

Nominal mass loss


Aliphatic hydrocarbons

15, 29, 43, 57, etc.

-CH 3 ,-CH 3CH 2 , ?CH 3(CH 2) n , etc.


-CH 2=CH 2

Aliphatic alcohols

1, 2, 15, 29, 43 etc.

-Ho, ?H 2, ?CH 3 , ?CH 3CH 2 , etc.


-H 2O


-CH 2=CH 2


as above, and 28, 29



31, 45, 59, etc.

-CH 3O , ?CH 3CH 2O , ?CH 3(CH 2) nO , etc.

Aliphatic amines


-NH 3

15, 29, 43, 57, etc.

-CH 3 , ?CH 3CH 2 , ?CH 3(CH 2) n , etc.

Aldehydes and ketones

1, 15, 29, 43, 57, etc.

-H , ?CH 3 , ?CH 3(CH 2) n , etc. (adjacent to C=O group)

Carboxylic acids, esters and amides

28, 43, 57, etc.

-CH 2=CH 2, ?R-CH 2-CH 2, etc. via a McLafferty rearrangement

16 or 17 or 31, 45, 59, etc.

?OH (acid), ? OR (ester) or ?NH 2 (amide)

Alkyl halides

19, 35/37, 79/81, 129

-F , ?Cl , ?Br , ?I (favoured for Br...

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