Cation-Exchanged Montmorillonite (M<sup><i>n</i>+</sup>-Mont)-Catalyzed Prins Reaction
作者:Jun-ichi Tateiwa、Keiji Hashimoto、Takayoshi Yamauchi、Sakae Uemura
DOI:10.1246/bcsj.69.2361
日期:1996.8
The Prins reaction of styrenes with paraformaldehyde or 1,3,5-trioxane in toluene in the presence of cation-exchanged montmorillonite (Mn+-mont), which worked as a Brønsted acid catalyst, at 80 °C produced 4-aryl-1,3-dioxanes selectively in up to 99% isolated yield with a turnover number of up to 5.9 × 102. Among the examined 21 Mn+-monts, Ce3+- and Fe3+-monts were revealed to be quite effective. Regeneration of the catalyst was confirmed with the Ce3+-mont, which could be effectively recycled at least three times. Many lanthanide metal ion-exchanged montmorillonites (Ln3+-monts) were prepared and characterized by X-ray powder diffraction (XRD) and temperature-programmed desorption of ammonia gas (NH3-TPD) methods.
在甲苯中,使用阳离子交换蒙脱石(Mn+-mont)作为布朗斯台德酸催化剂,在80°C下,苯乙烯与三聚甲醛或1,3,5-三氧六环进行普林斯反应,能够选择性地生成4-芳基-1,3-二氧六环,最高分离收率达99%,转化数高达5.9×102。在考察的21种Mn+-mont中,铈(III)和铁(III)蒙脱石显示出较高的效果。催化剂的再生性通过铈(III)蒙脱石得到证实,它至少可以有效地循环使用三次。许多镧系金属离子交换的蒙脱石(Ln3+-monts)通过X射线粉末衍射(XRD)和程序升温氨气脱附(NH3-TPD)方法制备并表征。