Guaiacyl group

Oniki, T. and Takahama, U. (1997). Free radicals produced by the oxidation of compounds containing syringyl and guaiacyl groups. Mokuzai Gakkaishi, 43(6), 493 98. 

Sodium periodate specifically oxidizes guaiacyl groups to quinones. Hydrogen and sodium peroxides in alkali are also somewhat selective in oxidizing lignin and destroy chromophoric groups such as quinones and carbonyl functions while also degrading only aromatic units with free phenolic hydroxyls to dibasic acids. 

FIGURE 15.9 Oxidation of guaiacyl groups to c>-quinonoid structures by manganese... 

Laurent E, Delmon B. Study of the hydrodeoxygenation of carbonyl, carboxylic and guaiacyl groups over sulfided CoMo/(-Al203) and NiMo/(-Al203) catalysts. I. Catalytic reaction schemes. Appl. Catal. A 1994 109 77. 

Polyacylhydrazone (Scheme ) derivatives having guaiacyl groups in the repeating unit were synthesized using vanillin and dibromoalkane as starting materials. When... 

Scheme 6 Scheme of polyethers having 4-hydroxyphenyl or guaiacyl groups... 

Polybenzalazine having guaiacyl groups in each repeating unit was prepared (Scheme 9). The obtained polymer was not soluble in dioxane, DMSO, DMF, m-cresol or chloroform. Melting temperature was observed at 205°C in a DSC heating curve (lO°Cmin ). was ca. 300°C. Polybenzalazine is a stable crystalline polymer [118, 119]. 

FIGURE 6.9. Overall structure of lignin. Major functional groups aliphatic OH, phenolic OH, methoxyl, carbonyl and guaiacyl groups. 

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