The reaction between 3,4-dichloroaniline and vanillic, syringic and protocatechuic acids was investigated in the presence of a laccase isolated from the fungus Rhizoctoniapraticola. The aniline alone was not oxidized by the laccase, but if incubated with the phenolic acids and the laccase, cross-linking took place. Particularly the protocatechuic acid and syringic acid reacted with 3,4-dichloroaniline, and cross-linked dimers were isolated as main products.

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