18167-90-3Relevant academic research and scientific papers
Efficient cobalt-catalyzed oxidative conversion of lignin models to benzoquinones
Biannic, Berenger,Bozell, Joseph J.
, p. 2730 - 2733 (2013/07/26)
Phenolic lignin model monomers and dimers representing the primary substructural units of lignin were successfully oxidized to benzoquinones in high yield with molecular oxygen using new Co-Schiff base catalysts bearing a bulky heterocyclic nitrogen base as a substituent. This is the first example of a catalytic system able to convert both S and G lignin model phenols in high yield, a process necessary for effective use of lignin as a chemical feedstock.
On the reactions of two fungal laceases differing in their redox potential with lignin model compounds: products and their rate of formation
Maarit, Lahtinen,Kristiina, Kruus,Petri, Heinonen,Jussi, Sipilae
experimental part, p. 8357 - 8365 (2010/08/19)
Laceases (EC 1.10.3.2) are multicopper oxidases able to oxidize phenolic compounds such as lignin-related polyphenols. Since the discovery that so-called mediators effectively extend the family of lacease substrates, direct interactions between lignin-like materials and lacease have gained much less attention. In this work, the aim was to characterize oxidation products formed in direct laccase-catalyzed oxidation of different guaiacylic and syringylic lignin model compounds with two different laceases: a low redox potential Melanocarpus alborneces lacease and a high redox potential Trametes hirsuta lacease. By following the formation of different, mainly biphenylic (5-5) and benzylic oxidation products, it was found that although both of these enzymes generated practically the same pattern of products with particular types of syringyl and guaiacyl compounds, in some cases a clear difference in the rates of their formation was observed. The results also confirm further to the suggestions that syringylic compounds are able to act as mediators in their own oxidation reactions and also that in some instances acetylation of phenolic material may produce altered, unexpected structures.
