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首页> 外文期刊>Dalton transactions: An international journal of inorganic chemistry >rho-Tolylimido rhenium(V) complexes with phenolate-based ligands: synthesis, X-ray studies and catalytic activity in oxidation with tert-butylhydroperoxide
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rho-Tolylimido rhenium(V) complexes with phenolate-based ligands: synthesis, X-ray studies and catalytic activity in oxidation with tert-butylhydroperoxide

机译:含酚盐基配体的rho-Tolylimido rh(V)配合物:合成,X射线研究和叔丁基过氧化氢氧化的催化活性

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摘要

The reactions of mer-[Re(rho-NTol)X-3(PPh3)(2)] (X = Cl, Br) with chelating phenolate-based ligands (2-(2-hydroxy-5-methylphenyl)benzotriazole (HL1), 2-(2-hydroxyphenyl)benzothiazole (HL2) or 2-(2-hydroxyphenyl)benzoxazole (HL3)) afforded a series of rho-tolylimido rhenium(V) complexes cis- or trans-(X,X)-[Re(rho-NTol)X-2(L)(PPh3)]center dot yMeCN (where X = Cl, Br; L = L-1, L-2, L-3 and y = 0-2) and [Re(rho-NTol)-X(L)(PPh3)(2)]Z center dot rho PPh3 (where X = Cl, Br; Z = ReO4, PF6; L = L-1, L-2, L-3 and rho = 0 or 1). The reported compounds were characterized by elemental analysis, FT-IR, NMR (H-1, C-13 and P-31) and X-ray crystallography. Interestingly, the halide ions of [Re(rho-NTol)Cl-2(L-1)(PPh3)]center dot MeCN (1) and [Re(rho-NTol)Cl-2(L-2)(PPh3)]center dot 2MeCN (3) are in cis relative dispositions, whereas the complexes [Re(rho-NTol)Br-2(L)(PPh3)] (L-1 for 2, L-2 for 4 and L-3 for 6) and [Re(rho-NTol)Cl-2(L-3)(PPh3)] (5) were found to be trans-(X,X) isomers. The compounds [Re(rho-NTol)X(L)(PPh3)(2)](PF6) (X = Cl, Br; L = L-1 and L-2) and [Re(rho-NTol)X(L-3)(PPh3)(2)](PF6)center dot PPh3 (X = Cl, Br) have been tested in oxidative catalysis. A few compounds exhibited very good catalytic properties in oxidation of alcohols with tert-BuOOH (TBHP) in acetonitrile solution at moderate temperatures. Complex [Re(rho-NTol)Cl(L-2)(PPh3)(2)]PF6 (13) is the catalyst of choice for oxidation of 1-phenylethanol to acetophenone (in 80% yield; turnover number attained 290 after 30 h) and cyclooctanol to cyclooctanone (in 88% yield). Notably lower activity has been found in the oxidation of alkanes with TBHP. Product distribution in the oxidation of methylcyclohexane indicates some steric hindrance around the reaction center.
机译:mer- [Re(rho-NTol)X-3(PPh3)(2)](X = Cl,Br)与螯合酚盐基配体(2-(2-羟基-5-甲基苯基)苯并三唑(HL1 ),2-(2-羟基苯基)苯并噻唑(HL2)或2-(2-羟基苯基)苯并恶唑(HL3))得到一系列的Rho-tolylimido en(V)络合物,顺式或反式(X,X)-[ Re(rho-NTol)X-2(L)(PPh3)]中心点yMeCN(其中X = Cl,Br; L = L-1,L-2,L-3和y = 0-2)和[Re (rho-NTol)-X(L)(PPh3)(2)] Z中心点rho PPh3(其中X = Cl,Br; Z = ReO4,PF6; L = L-1,L-2,L-3和rho = 0或1)。所报告的化合物通过元素分析,FT-IR,NMR(H-1,C-13和P-31)和X射线晶体学进行表征。有趣的是,[Re(rho-NTol)Cl-2(L-1)(PPh3)]中心点MeCN(1)和[Re(rho-NTol)Cl-2(L-2)(PPh3) ]中心点2MeCN(3)处于顺式相对位置,而络合物[Re(rho-NTol)Br-2(L)(PPh3)](L-1代表2,L-2代表4,L-3代表6)和[Re(rho-NTol)Cl-2(L-3)(PPh3)](5)被发现是反式-(X,X)异构体。化合物[Re(rho-NTol)X(L)(PPh3)(2)](PF6)(X = Cl,Br; L = L-1和L-2)和[Re(rho-NTol)X( L-3)(PPh3)(2)](PF6)中心点PPh3(X = Cl,Br)已在氧化催化中进行了测试。在适度的温度下,一些化合物在叔丁醇(TBHP)在乙腈溶液中的醇氧化中表现出非常好的催化性能。络合物[Re(rho-NTol)Cl(L-2)(PPh3)(2)] PF6(13)是1-苯基乙醇氧化为苯乙酮的选择催化剂(产率为80%; 30后达到290的营业额) h)和环辛醇制得环辛酮(产率88%)。在用TBHP氧化烷烃中发现明显较低的活性。甲基环己烷氧化反应中的产物分布表明反应中心周围存在一些空间位阻。

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