Alkaline aerobic oxidation of native softwood lignin in the presence of Na+-cyclic polyether complexes was written by Hosoya, Takashi;Kawase, Kei;Hirano, Yuki;Ikeuchi, Mizuki;Miyafuji, Hisashi. And the article was included in Journal of Wood Chemistry and Technology in 2022.Related Products of 112-49-2 This article mentions the following:
Alk. aerobic oxidation is a promising way to convert lignin to low mol. weight phenols, especially 4-hydroxybenzaldehydes. Our previous studies reported that oxidation of softwood lignin samples with a bulky cation, Bu4N+, facilitates selective production of vanillin (4-hydroxy-3-methoxybenzaldehyde). This study presents vanillin production from native softwood lignin in Japanese cedar (Cryptomeria japonica) in NaOH aqueous in the presence of cyclic polyethers, with our expectation that Na+-polyether complexes exhibit effects similar to those of Bu4N+. Oxidation of wood flour (10 mg) in 4.0 M NaOH aqueous (2.0 mL) at 120°C under air gave vanillin with 6.2 weight% lignin-based yield, which was raised to 15.2 weight% by the addition of 15-crown-5 (1,4,7,10,13-pentaoxacyclopentadecane). On the other hand, such effect was not observed with the addition of tetraethylene glycol di-Me ether, a non-cyclic analog of 15-crown-5. Mechanistic study with a lignin model compound revealed that stabilization of a vanillin precursor by the complex cation was a reason for the increased vanillin yield exhibited by the crown ether. This is similar to the influence of Bu4N+ reported previously, suggesting effective control of aerobic oxidation by large size cationic species. In the experiment, the researchers used many compounds, for example, 2,5,8,11-Tetraoxadodecane (cas: 112-49-2Related Products of 112-49-2).
2,5,8,11-Tetraoxadodecane (cas: 112-49-2) belongs to ethers. Of all the functional groups, ethers are the least reactive ones. Ether bonds are quite stable towards bases, oxidizing agents and reducing agents. But on the other hand, ethers undergo cleavage by reaction with acids. Ethers are good solvents partly because they are not very reactive. Most ethers can be cleaved, however, by hydrobromic acid (HBr) to give alkyl bromides or by hydroiodic acid (HI) to give alkyl iodides.Related Products of 112-49-2
Referemce:
Ether – Wikipedia,
Ether | (C2H5)2O – PubChem