Highly Selective Epoxidation of Cycloaliphatic Alkenes with Aqueous Hydrogen Peroxide Catalyzed by [PO<sub>4</sub>{WO(O<sub>2</sub>)<sub>2</sub>}<sub>4</sub>]<sup>3−</sup>/Imidazole
作者:Keigo Kamata、Kosei Sugahara、Ryo Ishimoto、Susumu Nojima、Motoya Okazaki、Takaya Matsumoto、Noritaka Mizuno
DOI:10.1002/cctc.201402268
日期:2014.8
peroxotungstate, THA3[PO4WO(O2)2}4] (I, THA=tetra‐n‐hexylammonium), could act as an efficient catalyst for epoxidation of cycloaliphatic alkenes with 30 % aqueous hydrogen peroxide (H2O2). Compound I showed higher catalytic activity and selectivity to epoxide than other tungstates. By using the I/imidazole system, various kinds of cycloaliphatic alkenes could be highly selectively converted into the
在咪唑作为添加剂的情况下,含磷的四核过氧钨酸盐THA 3 [PO 4 WO(O 2)2 } 4 ](I,THA = tetra- n- hexylammonium)可以作为一种有效的催化剂用30%的过氧化氢水溶液(H 2 O 2)对脂环族烯烃进行环氧化。与其他钨酸盐相比,化合物I显示出更高的催化活性和对环氧化物的选择性。通过使用我在咪唑体系中,几乎在化学计量的条件下,各种脂环族烯烃都可以高选择性地高度选择性地转化为酸敏感的环氧化物,包括工业上重要的二环氧化合物。的1 H NMR光谱表明,咪唑将工作不仅作为质子受体也可作为路易斯碱,以显着抑制环氧化物的酸催化的开环。