Insight into the structural features of macromolecular aromatic species in Huolinguole lignite through ruthenium ion-catalyzed oxidation

HL is rich in bridged linkages and CH2CH2 and CH2CH2CH2 are the main bridged linkages connecting aromatic rings according to ruthenium ion-catalyzed oxidation and subsequent analyses of the resulting soluble products with GC/MS and ASAP/TOF-MS.