Guaiacol demethoxylation catalyzed by Re2O7 in ethanol

Investigating the mechanism of the flavor formation in Sichuan sun vinegar based on flavor-orientation and metagenomics

“…The concentration of volatile phenol compounds (phenol, 2-methoxy-, phenol, 2-methoxy-4-methyl-, and phenol, 4-ethyl-2-methoxy-) may be related to yeast ( du Plessis et al, 2021 ). Furthermore, 2,4-bis(1,1-dimethylethyl)-phenol is most likely the product of guaiacol deoxyalkylation ( Yan et al, 2020 ). With the exception of 4-methyl pyrazine, the remaining pyrazines, furans, and sulfur compounds may be formed by complex reactions, such as the Maillard reaction, Strecker degradation, and lipid oxidation ( Jia et al, 2019 ; Yang et al, 2020 ).…”

Selective demethylation reactions of biomass-derived aromatic ether polymers for bio-based lignin chemicals

“…135 Rhenium oxide (Re 2 O 7 ) converted guaiacol into phenol and alkyl phenols at 280-320 °C in ethanol as a (hydrogen donor) solvent under an inert gaseous atmosphere. 136 Bimetallic RuRe catalyst supported on carbon showed considerably higher activity for HDO; after 4 hours of treatment at 240 °C under 20 bar of H 2 almost all the guaiacol was converted into cyclohexane. 137 When water was added to the reaction mixture using a ReS 2 /SiO 2 catalyst the conversion of guaiacol was significantly lower.…”

Advanced progress of rhenium (Re)-based electrode materials in electrocatalytic hydrogen evolution: a review

“…As we know, Re is a multiple-valence element, and Re-based oxides exist in multifarious types including rhenium heptoxide (Re 2 O 7 ), rhenium dioxide (ReO 2 ), rhenium trioxide (ReO 3 ), rhenium trioxide (Re 2 O 3 ), rhenium oxide (Re 2 O), etc. 73,74 Generally, the overpotential of metal oxides is high towards the electrocatalytic HER, resulting in these catalysts being rarely studied. According to relevant reports, ReO 3 has electrocatalytic HER performance due to the metal-like electric conductivity.…”