Reactions – hemicelluloses The main pyrolysis product of pentoses (i.e., mostly D-xylose and L-arabinose from xylan) is furfural and of hexoses (i.e., mostly D-glucose, D-mannose and D-galactose from (galacto)glucomannan) 5-(hydroxymethyl)furfural as well as anhydrosugars (principally including levoglucosan from D-glucose), ketones (e.g., hydroxyacetone, furanones, pyranones, cyclopentanones and cyclopentenones), some phenols and gaseous products (e.g., carbon dioxide,
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