Acid-Catalyzed Transesterification for Preparation of Long-Chain Alkenyl Acetate Insect Sex Pheromones

Introduction: Long-chain alkenyl acetates are the key components of insect sex pheromones. This study explores the synthesis of these pheromones via ethyl acetate esterification of long-chain alkenyl alcohols, providing an efficient route for pest control applications. Method: Acid-catalyzed esterification was carried out. (Z)-Hexadec-11-1-ol (Z11-16OH) was esterified with ethyl acetate to synthesize (Z)-hexadec-11-en-1-yl acetate (Z11-16OAc) using various acid catalysts. Results: After optimization, 20% hydrochloric acid was found to be the best catalyst, enabling efficient reactions at 80°C for 3 h. A 1 kg scale reaction yielded Z11-16OAc in 77% yield. The optimized conditions were also successfully applied to synthesize other alkenyl acetates from different long-chain alkenyl alcohols, all with yields over 80%. Conclusion: This method offers significant advantages for the synthesis of long-chain alkenyl acetate insect sex pheromones, including easy purification and readily available starting materials. conclusion: This method offers significant advantages for the industrial production of long-chain alkenyl acetate insect sex pheromones, including mild reaction conditions, readily available starting materials, and exceptionally low cost.