Dioxomolybdenum(VI) Complexes with Salicylamide Ligands: Synthesis, Structure, and Catalysis in the Epoxidation of Olefins under Eco‐Friendly Conditions
作者:Cosimo Annese、Daniela Caputo、Lucia D'Accolti、Caterina Fusco、Angelo Nacci、Andrea Rossin、Giulia Tuci、Giuliano Giambastiani
DOI:10.1002/ejic.201801096
日期:2019.1.17
in MoO2(R1R2SaAm)2 complexes 2a‐e, which were characterized through elemental analysis, IR, 1H‐ and 13C NMR, ESI‐HRMS, and XRD (for 2a,b,e). All complexes are active catalysts in the solvent‐free epoxidation of cis‐cyclooctene with tert‐butyl hydroperoxide in decane (TBHPdec), showing high turnover frequencies (TOF 1890 h–1 for 2b) at 1 % loading. Using aqueous TBHP (TBHPaq) or H2O2, selectivity to cyclooctene
五种水杨酰胺[ R1 R2 SaAmH; R 1,R 2 = N-取代基:n Bu,H(1a); t Bu,H(1b); n Oc,H(1c);Bn,H(1d); 和n Bu,n Bu(1e)]成功地与二氧钼片段配位,产生MoO 2(R1 R2 SaAm)2配合物2a-e,通过元素分析,IR,1 H-和13进行表征C NMR,ESI-HRMS和XRD(对于2a,b,e)。所有配合物都是顺式环辛烯与叔丁基氢过氧化物在癸烷中的无溶剂环氧化的活性催化剂(TBHPdec),在1%的负载下显示出高周转频率(TOF 1890 h –1对于2b)。使用TBHP(TBHPaq)或H 2 O 2水溶液,对环辛烯氧化物的选择性始终为100%,尽管反应更缓慢。在图2c / TBHPaq系统,它显示最佳TOF(1070ħ -1)在0.25%装载和75℃,允许的定量转化反将-2-辛烯转化成环氧化物,而对于1-辛烯,