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Abstract <p>For the first time, a noncatalytic transesterification reaction (alcoholysis) of bornyl acetate in commercial fir needle essential oil (FNEO) is carried out using supercritical lower alcohols: methanol, ethanol, and isopropanol. Only the use of methanol is shown to ensure high conversion and selectivity of the reaction. For example, at 350°C after 1 h of the reaction in an autoclave reactor, 93% selectivity for borneol with 90% conversion of bornyl acetate is achieved. A further increase in the reaction time leads to a decrease in selectivity for borneol due to an unexpected increase in the concentration of camphor.</p>

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Supercritical Alcoholysis of Bornyl Acetate in Fir Needle Essential Oil for Borneol Production

  • 期刊论文

  • 发表日期：

    2025年12月1日

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  • A. M. Chibiryaev,
  • I. V. Kozhevnikov,
  • O. N. Martyanov

摘要

Abstract

For the first time, a noncatalytic transesterification reaction (alcoholysis) of bornyl acetate in commercial fir needle essential oil (FNEO) is carried out using supercritical lower alcohols: methanol, ethanol, and isopropanol. Only the use of methanol is shown to ensure high conversion and selectivity of the reaction. For example, at 350°C after 1 h of the reaction in an autoclave reactor, 93% selectivity for borneol with 90% conversion of bornyl acetate is achieved. A further increase in the reaction time leads to a decrease in selectivity for borneol due to an unexpected increase in the concentration of camphor.