Fragments for the peaks in mass spectrometry of tributylamine.

Question

Fragments for the peaks in mass spectrometry of tributylalmine

The above mentioned compound with mw=185.

Write the reaction mechanisms and structures to account for the peaks at the following masses:185,142,100.

Answer 1

m/z = 185 corresponds to [N(CH2CH2CH2CH3)3]+

 

a butyl group has a mass of 57.

a propyl group has a mass of 43; therefore,

 

m/z = 142 corresponds to [N(C4H9)2(CH2)]+

 

and 

 

m/z = 100 corresponds to [N(C4H9)(CH3)(CH2)]+