A new halide-free efficient reaction-controlled phase-transfer catalyst based on silicotungstate of [(C<sub>18</sub>H<sub>37</sub>)<sub>2</sub>(CH<sub>3</sub>)<sub>2</sub>N]<sub>3</sub>[SiO<sub>4</sub>H(WO<sub>5</sub>)<sub>3</sub>] for olefin epoxidation, oxidation of sulfides and alcohols with hydrogen peroxide
The oxidation of various alkenes (such as linear terminalolefins, internal olefins, cyclic olefins and unactivated alkenes) to epoxides, sulfides to sulfoxides and sulfones, alcohols to carbonyl compounds, are successfully catalyzed by this recyclable and environmentally benign catalyst using H2O2 as oxidant and ethyl acetate as solvent. This catalyst is not only capable of catalyzing homogeneous oxidation
开发了一种基于[[C 18 H 37)2(CH 3)2 N] 3 [SiO 4 H(WO 5)3 ]的硅钨酸盐的新型反应控制相转移催化剂。该催化剂是用硅作为杂原子,其是该组成为:季铵heteropolyoxotungstates的先前报道的反应控制的相转移催化剂不同的新的杂多化合物[π-C 5 H ^ 5 N(CH 2)15 CH 3 ] 3 [PW 4 O 16]和[π-C 5 H ^ 5 N(CH 2)15 CH 3 ] 3 [PW 4 ø 32 ]与磷作为杂原子。通过使用H 2 O 2,这种可回收利用且对环境无害的催化剂成功地将各种烯烃(例如直链末端烯烃,内烯烃,环状烯烃和未活化的烯烃)氧化成环氧化物,将硫化物氧化成亚砜和砜,将醇氧化成羰基化合物。作为氧化剂,乙酸乙酯作为溶剂。该催化剂不仅能够催化具有独特的反应控制相转移特性的有机底物的均相氧化,而且避免使用有毒溶剂。反应后催化剂易于