100621-95-2Relevant academic research and scientific papers
Highly effective C-C bond cleavage of lignin model compounds
Wang, Yinling,Wang, Qianyi,He, Jianghua,Zhang, Yuetao
, p. 3135 - 3141 (2017)
A highly effective method is developed for the C-C bond cleavage of lignin model compounds. The inert Cα-Cβ or Cα-Cphenyl bond of oxidized lignin model compounds was successfully converted to an active ester bond through the classic organic name reaction, Baeyer-Villiger (BV) oxidation, and thus acetal esters and aryl esters were produced in high yields (up to 99%) at room temperature. Next, K2CO3 catalyzed the alcoholysis of the resulting ester products at 45 °C, affording various useful chemical platforms in excellent yields (up to 99%), such as phenols and multifunctional esters. This method uses commercially available reagents, is transition-metal free and simple, but highly effective, and involves mild reaction conditions.
Metal Catalyst-Free Oxidative C?C Bond Cleavage of a Lignin Model Compound by H2O2 in Formic acid
Li, Xiukai,Zhang, Yugen
, p. 1740 - 1745 (2020)
Selective cleavage of the β-O-4 ether bond of lignin to produce aromatics is one of the most important topics for the sustainable production of chemicals from biomass. A simple system has been developed for Cα?Cβ bond cleavage of a β-O-4 ketone-structured lignin model compound (LMC) by H2O2 in formic acid under metal catalyst-free conditions. By using this simple system, with H2O2, formic acid, and mineral acid catalyst, over 90 % product yield is achieved in 6 h at room temperature. The reaction proceeds through the classic Baeyer–Villiger oxidation and in situ-generated performic acid serves as the key oxidant. The cleavage of alcoholic LMCs by using the presented method in a two-step process is also demonstrated.
A lignin oxidation into small molecules of aromatic compounds (by machine translation)
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Paragraph 0026; 0027; 0028, (2017/08/30)
A lignin oxidation into small molecules of aromatic compounds, which belongs to the technical field of biomass degradation, in particular to a through a non-transition metal catalyzed organic method fracture C - C key, will oxidize lignin into small molecules of aromatic compounds. First will oxidize lignin in the organic solvent is the oxidizing agent, and then the obtained intermediate product at the catalyst under the action of hydrolysis or alcoholysis, to obtain small molecular aromatic compound, such as methoxy substituted benzoic acid, methoxy substituted phenol, methoxy substituted benzoates, chain alcohol and the like. The invention has simple step, mild reaction conditions, high conversion rate (can be up to 100%), without the need of transition metal and the like, to oxidizing lignin a plurality of connection have all played a role, can reach the high selectivity, high-effectively degrade the purpose of lignin, and is favorable for the large-scale industrial application. (by machine translation)
