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Radicals from the gas-phase pyrolysis of a lignin model compound: p-coumaryl alcohol.


ABSTRACT: The intermediate radicals produced in the gas-phase pyrolysis of one of the main building blocks of lignin - p-coumaryl alcohol (p-CMA) - were investigated using the low temperature matrix isolation technique interfaced with electron paramagnetic resonance spectroscopy (LTMI-EPR). An anisotropic EPR spectrum characterized by a high g-value (>2.0080) and a relatively low saturation coefficient (?1.40) throughout the high pyrolytic temperature region (700 to 1000 °C) was observed. Theoretical calculations revealed plausible decomposition pathways for p-CMA comprising highly delocalized aromatic radicals. The results provide evidence for a dominant role of oxygen-centered radicals during the pyrolysis of p-CMA.

SUBMITTER: Xu MX 

PROVIDER: S-EPMC5407301 | biostudies-literature | 2016

REPOSITORIES: biostudies-literature

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Radicals from the gas-phase pyrolysis of a lignin model compound: <i>p</i>-coumaryl alcohol.

Xu Meng-Xia MX   Khachatryan Lavrent L   Baev Alexander A   Asatryan Rubik R  

RSC advances 20160615 67


The intermediate radicals produced in the gas-phase pyrolysis of one of the main building blocks of lignin - <i>p</i>-coumaryl alcohol (<i>p</i>-CMA) - were investigated using the low temperature matrix isolation technique interfaced with electron paramagnetic resonance spectroscopy (LTMI-EPR). An anisotropic EPR spectrum characterized by a high <i>g</i>-value (>2.0080) and a relatively low saturation coefficient (∼1.40) throughout the high pyrolytic temperature region (700 to 1000 °C) was obser  ...[more]

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