Keggin-type heteropolyacids have been used as catalyst for the selective oxidation of olefins to the corresponding epoxides in multiphase conditions (isooctane/Aliquat 336/water). Multiphase system allowed achieving a higher conversion (72%) and selectivity (70%) to epoxide than the corresponding homogeneous or biphasic systems in the presence of the same catalyst. Optimization of the multiphase system has been conducted considering reaction time, temperature, amount of the catalysts and quantity of the oxidant. The best-found reaction conditions were then employed for the selective epoxidation of several substrates. Interestingly, it was shown that, in the multiphase system, only an insignificant decomposition of hydrogen peroxide was observed.

Furthermore, an environmental assessment has been conducted comparing green metrics related to the homogenous, biphasic and multiphase systems herein investigated.

Keggin型杂多酸已被用作在多相条件下（异辛烷/ Aliquat 336 /水）将烯烃选择性氧化为相应环氧化物的催化剂。在相同的催化剂存在下，多相体系与相应的均相或双相体系相比，可以实现更高的转化率（72％）和选择性（70％）。考虑到反应时间，温度，催化剂量和氧化剂量，对多相系统进行了优化。然后采用最佳发现的反应条件对几种底物进行选择性环氧化。有趣的是，已表明在多相系统中，仅观察到了微不足道的过氧化氢分解。

此外，已经进行了环境评估，以比较与本文研究的同质，双相和多相系统有关的绿色指标。