Mass-Spectral Behavior of Some Common Functional Groups

Mass-Spectral Behavior of Some Common Functional Groups 

As each functional group is discussed in future chapters, any mass-spectral fragmentation characteristic of that group will be described. For the present, though, we ll point out some distinguishing features of several common functional groups. 

In the dehydration pathway, water is eliminated, yielding an alkene radi cal cation with a mass 18 units less than M  

Aliphatic amines undergo a characteristic a cleavage in the mass spe trometer, similar to that observed for alcohols. A C-C bond nearest the nitro gen atom is broken, yielding an alkyl radical and a nitrogen-containin cation  

In addition, ketones and aldehydes also undergo a cleavage of the boi between the carbonyl group and the neighboring carbon. Alpha cleavaj yields a neutral radical and an oxygen-containing cation. 

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Interpreting Mass Spectra 444 Interpreting Mass-Spectral Fragmentation Patterns Mass-Spectral Behavior of Some Common Functional Groups 449... 

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