Activation behavior of 4-AcNH-TEMPO by ClO2 for selective oxidation of cellulose in DMAc/LiCl system
Source abstract
Abstract
Abstract The cellulose catalytic oxidation system mainly comprises of inorganic ion-based oxidants. Hence, the selective oxidation of C6−primary hydroxyls (C6-OH) of cellulose, catalyzed by piperidine free radicals, was limited to the homogeneous cellulosic system containing protic solvents or heterogeneous system. In this work, use of the catalytic system containing 4-acetamido-2,2,6,6-tetramethylpiperidine 1-oxyl (4-AcNH-TEMPO) was extended to the cellulosic solution in N, N-dimethylacetamide (DMAc) and combined with chlorine dioxide. Results showed that the carboxyl content was 0.832 mmol/g. Meanwhile, the degree of polymerization decreased slightly from 900 to 489. This study provides an effective route for the homogeneous selective oxidation of primary hydroxyl groups in cellulose and explored its oxidation mechanism in DMAc solvent. Furthermore, studies showed that the reactive chlorine species- ClO•, Cl•, and ClO2 played a crucial role in the oxidation process. The methodology developed here displayed great potential to be utilized to various biomolecules in aprotic solvents homogeneous system based on 4-AcNH-TEMPO as oxidation catalysts.
Source: openaire · Quality: candidate unverified · Source record ↗
Research context
OpenAlex topics: Advanced Cellulose Research Studies · Enzyme-mediated dye degradation · Lignin and Wood Chemistry
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
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