An article Catalytic oxidation of biorefinery corncob lignin via zirconium(IV) chloride and sodium hydroxide in acetonitrile/water: A functionality study WOS:000467391900019 published article about MODEL COMPOUNDS; CHEMICAL-STRUCTURE; ALCOHOL OXIDATION; STRUCTURAL-CHARACTERIZATION; THERMAL-PROPERTIES; AEROBIC OXIDATION; BOND-CLEAVAGE; PYROLYSIS; COPPER; DEPOLYMERIZATION in [Lin, Fei; Liu, Chao; Hu, Changsong; Wu, Shiliang; Xiao, Rui] Southeast Univ, Sch Energy & Environm, Minist Educ, Key Lab Energy Thermal Convers & Control, Nanjing 210096, Jiangsu, Peoples R China; [Wang, Xing] Dalian Polytech Univ, Sch Light Ind & Chem Engn, Liaoning Key Lab Pulp & Paper Engn, Dalian 116034, Peoples R China in 2019.0, Cited 54.0. Category: indole-building-block. The Name is 4′-Hydroxyacetophenone. Through research, I have a further understanding and discovery of 99-93-4
In order to realize the efficient utilization of biorefinery corncob lignin, the promising catalytic oxidation strategy was carried out by using ZrCl4 and NaOH as the co-catalyst and dioxygen as the oxidant in MeCN/H2O. GC/MS, GC-FID, and MALDI-TOF/MS were employed to recognize the produced monomers and oligomers, and GPC was used to monitor the molecular weight changes of lignin fragments. In addition, specific structural evolution of corncob lignin during ZrCl4/NaOH-catalyzed oxidation were revealed by quantitative C-13 (Q(13)C) and 2D HSQC NMR techniques. Results showed that the total yields of produced oxidation monomers reached 6.8 wt%, and aromatic aldehydes were the major species, in which vanillin and 4-hydroxybenzaldehyde were the two dominant products. After ZrCl4/NaOH-catalyzed oxidation, the weight-average molecular weight of corncob lignin and its products decreased from 2000 Da to 300 Da after oxidation with 16 h. Moreover, Q(13)C NMR analysis showed the decrease percentage of C-O aliphatic carbons (including methoxyl carbons), the increase percentage of C-C aliphatic and carbonyl carbons, and the relative stable percentage of aromatic carbons with reaction prolonged. These results combined with the further confirmation from HSQC indicated the oxidative cleavage of C-O aliphatic linkages and removal of methoxy groups within corncob lignin, as well as the formation of C-C aliphatic bonds and carbonyl groups. The work presented a comprehensive insight into the catalytic oxidative depolymerization of biorefinery corncob lignin. (C) 2019 Elsevier B.V. All rights reserved.
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Reference:
Indole alkaloid derivatives as building blocks of natural products from Bacillus thuringiensis and Bacillus velezensis and their antibacterial and antifungal activity study,
,Preparation of Indole Containing Building Blocks for the Regiospecific Construction of Indole Appended Pyrazoles and Pyrroles