Pyrolysis of lignin models compared to ion fragments formation

The fragments seen in these spectra correspond well with compounds detected in the pyrolysis products of the two compounds, as well as with compounds seen in the pyrolysis products of several lignins (see Section 9.1). The compounds found in the pyrolysis products (generated at 600° C) of the two lignin models that are similar to the fragments seen in the mass spectra are shown in Table 3.6,1. 

Compound MW Rel, intensity for trimer A Rel. intensity for trimer B Fragment in MS 

The presence of free radicals in pyrolytic reactions seems to be a common event, as seen by the increase in certain more stable species as the pyrolysis temperature increases. At elevated temperatures, higher levels of aromatic compounds, polynuclear aromatic compounds, or small molecules tend to be formed. These compounds were not seen in the mass spectra fragments, where only intramolecular rearrangements are more common. 

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Pyrolysis of lignin models compared to ion fragments formation. 

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