Acid-Catalyzed Cross-Linking Reactions at Benzylic Sites in Flurence Monomers, Polymers, and Lignin

摘要

The acid-catalyzed polymerization of benzylic alcohol and fluoride functionality in monomeric and polymeric fluorenes was investigated in both organic and aqueous reaction media. Polymeric products are consistent with the generation of benzylic cations that participate in electrophilic aromatic substitution reactions. Similar reactions occurred in a water-insolube Kraft pine lignin, by treatment with aqueous aicd. The acid treatment produced 1-2 cross-links/100 carbons in the bipolymker and markedly decrased its solubility in organic solvents. The nature of the reactions with produced the insoluble biopolyer are inferred from soil stttke (CP/MAS )~13C NMR spectra.