Abstract Isomerization of β-pinene epoxide to perillyl alcohol using several materials based on titanium and molybdenum is reported. The metals were incorporated on SBA-15, MCM-41 and SiO 2 supports by incipient wetness impregnation and characterized by XRD, atomic absorption, BET, Raman spectroscopy, diffuse reflectance UV–Vis spectroscopy, TPD-NH 3 and 29 Si NMR. After metal incorporation, crystallinity and surface area of both MCM-41 and SBA-15 decreased. UV–Vis and Raman also revealed the presence of MoO 3 species and no presence of TiO 2 . In addition, Ti materials showed less amount of acid sites than catalysts containing Mo. Synthesis of perillyl alcohol from β-pinene epoxide was affected by the content of acid sites; Mo/SBA-15 catalyst was more active than Mo/MCM-41 and Mo/SiO 2 supported materials. Over Mo/SBA-15 a complete β-pinene epoxide conversion and perillyl alcohol selectivity of 63% were obtained at 1 h of reaction, results that are similar to the best activity reported up to now; Mo/SBA-15 can be recycled at least six times without any appreciable loss of conversion nor selectivity. Finally, a reaction pathway is proposed based on experimental information, explaining the exclusive formation of perillyl alcohol from β-pinene epoxide. Graphical Abstract

中文翻译：

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β-蒎烯环氧化物在钛和钼负载催化剂上选择性合成紫苏醇

摘要 报道了使用几种基于钛和钼的材料将 β-蒎烯环氧化物异构化为紫苏醇。通过初湿浸渍将金属结合在 SBA-15、MCM-41 和 SiO 2 载体上，并通过 XRD、原子吸收、BET、拉曼光谱、漫反射 UV-Vis 光谱、TPD-NH 3 和 29 Si NMR 表征。加入金属后，MCM-41 和 SBA-15 的结晶度和表面积均降低。UV-Vis 和拉曼也揭示了 MoO 3 物种的存在和 TiO 2 的不存在。此外，Ti材料比含Mo的催化剂显示出较少的酸位点。β-蒎烯环氧化物合成紫苏醇受酸位点含量的影响；Mo/SBA-15 催化剂比 Mo/MCM-41 和 Mo/SiO 2 负载材料更具活性。在 Mo/SBA-15 上，在反应 1 小时时获得了完全的 β-蒎烯环氧化物转化率和 63% 的紫苏醇选择性，结果与迄今为止报道的最佳活性相似；Mo/SBA-15 可以循环使用至少六次，而没有任何明显的转化率和选择性损失。最后，基于实验信息提出了反应途径，解释了β-蒎烯环氧化物独家形成紫苏醇。图形概要 解释了从 β-蒎烯环氧化物独家形成紫苏醇。图形概要 解释了从 β-蒎烯环氧化物独家形成紫苏醇。图形概要