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  1. Coupling and reactions of lignols and new lignin monomers: A density functional theory study

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    Author(s): Thomas Elder; José C. del Río; John Ralph; Jorge Rencoret; Hoon Kim; Gregg T. Beckham; Michael F. Crowley
    Date: 2020
    Source: ACS Sustainable Chemistry & Engineering
    Publication Series: Scientific Journal (JRNL)
    Station: Southern Research Station
    DOI: https://doi.org/10.1021/acssuschemeng.0c02880
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    Description

    This perspective summarizes and compares computational results for the thermodynamics of bond dissociation, coupling, and rearomatization for a number of noncanonical lignin monomer−lignol combinations that have been found to occur experimentally. The noncanonical lignin monomers discussed are tricin, caffeyl alcohol, 5-hydroxyconiferyl alcohol, and piceatannol. Among dimeric combinations, the results for bond dissociation are generally similar, but in cases for which trimers have been reported (tricin-lignol adducts), this value can be quite variable, with stereochemical and structural preferences. Among the adducts examined thus far, the energies associated with quinone methide formation and rearomatization are not dissimilar and would not impede subsequent polymerization. These fundamental studies may help to elucidate how lignin monomers are incorporated into the lignin polymer, provide leads for targeted genetic modification, and be of use in deconstruction for the production of commodity chemicals.

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    Citation

    Elder, Thomas; del Río, José C.; Ralph, John; Rencoret, Jorge; Kim, Hoon; Beckham, Gregg T.; Crowley, Michael F. 2020. Coupling and reactions of lignols and new lignin monomers: A density functional theory study. ACS Sustainable Chemistry & Engineering. 8(30): 11033-11045. https://doi.org/10.1021/acssuschemeng.0c02880.

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    Keywords

    Tricin, Piceatannol, Caffeyl alcohol, 5-Hydroxyconiferyl alcohol, Lignin

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