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The forest products industry has a very important role in the development toward a sustainable, biobased society. However, many fungi that deteriorate the main structural components of wood, such as cellulose, hemicellulose and lignin, are able to cause decay in standing trees, leading to significant losses in forest output due to impacts on biomass production. Trametes versicolor (L.: Fr) Pilát is a fungus able to attack the trees by saprotrophic and parasitic life strategies, causing white-rot of wood species, a serious problem for the industry that is focused on wood and its uses. The objectives of the work were the synthesis of organotin(IV) carboxylate of a natural product (ent-kaurenoic acid), characterization of the structures and anti-fungal evaluation against T. versicolor, as a contribution of new alternatives for the wood preservation. The synthesis of organotin(IV) complexes derived from the diterpene tetracyclic ent-kaur-16-en-19-oic acid (ent-kaurenoic acid, KA) gave three new complexes potentially active against T. versicolor. The complexes were characterized by FTIR and NMR spectroscopy. The biological activity was evaluated by a gel dilution method with superficialplate inoculation, using 60 and 120 μg/mL concentration, for the KA and the three organotin(IV) complexes. A considerably higher bioactivity was observed to the 120 μg/mL concentration, and for the complex with greater molecular weight.

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SYNTHESIS AND CHARACTERIZATION OF THREE ORGANOTIN(IV) CARBOXYLATE OF ENT-KAURENOIC ACID: ANTIFUNGAL ACTIVITY AGAINST TRAMETES VERSICOLOR (L.: FR) PILÀT