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Probing the Carbonyl Functionality of a Petroleum Resin and Asphaltene through Oximation and Schiff Base Formation in Conjunction with N-15 NMR

Fig 5

Liquid-state DEPTGL C-13 NMR methyl subspectra of resin before and after PTC-methylation with 13CH3I and 13C-diazomethylation.

LB = line broadening.

Fig 5

doi: https://doi.org/10.1371/journal.pone.0142452.g005