Síntese de substâncias atrativas a pragas do algodoeiro - Heliothis virescens (Fabricius, 1781) e Spodoptera frugiperda (J. E. Smith, 1797)

Abstract

The culture of cotton has great representativeness in agribusiness and for the economy of Brazil. However, the presence of pests such as Heliothis virescens and Spodoptera frugiperda on the plantations has caused constant damage to producers in Brazil and worldwide. The control of these pests is usually done with the application of pesticides, but due to their potential toxicity to health, new control methods are being sought, such as the use of pheromones. These are natural substances used in intraspecific species communication. For H. virescens, studies indicate that the unsaturated aldehydes Z-11-hexadecenal and Z-9-hexadecenal are part of the pheromonal mixture that can be used to control this pest. As for S. frugiperda, Z-9-tetradecenila acetate and Z-11-hexadecenila acetate are compounds identified as components of the pheromonal mixture of this pest. The objective of this work was to synthesize compounds identified as pheromones of H. virescens and S. frugiperda. The synthetic route used was based on the retrosynthesis of the molecules, from this, 6-step synthetic routes were proposed for each of the 4 compounds. The synthetic pathway used were quite efficient, with the products being satisfactorily obtained.