![]() ![]() Reactions using lignin model compounds (LMCs, guaiacylglycerol-β-guaiacyl ether and various aromatic more » monomers) confirmed the formation of the uncondensed moieties and revealed the synergy between LiBr and acid in inducing the crucial intermediate benzyl carbocations, which then led to cleavage of the β- O-4-aryl ether bonds to produce Hibbert's ketones, demethylation to produce benzodioxanes, and condensation reactions. The benzodioxane structure was identified and confirmed for the first time in an acid-depolymerized lignin. The ALBTH lignins isolated from biomass sources representing the three plant classes (hardwoods, softwoods, and grasses) contained abundant uncondensed moieties (i.e., Hibbert's ketones and benzodioxanes). Here, this study demonstrated that lignin could be efficiently depolymerized in the solid state with minimal condensation and separated from biomass with high purity by dissolving and hydrolyzing cellulose and hemicelluloses, using an acidic lithium bromide trihydrate (ALBTH) system under mild conditions (with 40 mM HCl at 110 ☌). Publication Date: Research Org.: Great Lakes Bioenergy Research Center (GLBRC), Madison, WI (United States) Sponsoring Org.: USDOE Office of Science (SC), Biological and Environmental Research (BER) OSTI Identifier: 1543278 Grant/Contract Number: SC0018409 FC02-07ER64494 AC05-000R22725 Resource Type: Accepted Manuscript Journal Name: Science Advances Additional Journal Information: Journal Volume: 4 Journal Issue: 9 Journal ID: ISSN 2375-2548 Publisher: AAAS Country of Publication: United States Language: English Subject: 59 BASIC BIOLOGICAL SCIENCES 37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL = , École Polytechnique Fédérale de Lausanne (Switzerland).of North Texas, Denton, TX (United States) Oak Ridge National Lab. of New Jersey, New Brunswick, NJ (United States) Bakto Flavors LLC, North Brunswick, NJ (United States) ![]() ![]() of Wisconsin, Madison, WI (United States) Kyoto Univ. (Virginia Tech), Blacksburg, VA (United States) of Wisconsin, Madison, WI (United States) Virginia Polytechnic Inst. of Wisconsin, Madison, WI (United States) ![]()
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