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首页> 外文期刊>Dalton transactions: An international journal of inorganic chemistry >Scandium bis(trimethylsilyl)methyl complexes revisited: extending the(45)Sc NMR chemical shift range and a new structural motif of Li[CH(SiMe3)(2)]
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Scandium bis(trimethylsilyl)methyl complexes revisited: extending the(45)Sc NMR chemical shift range and a new structural motif of Li[CH(SiMe3)(2)]

机译:钪(三甲基甲硅烷基)重新致密的甲基复合物:延伸(45)SC NMR化学换档范围和LI [CH(SIME3)(2)]的新结构基序。

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Depending on the molar ratio employed, the reaction of ScCl3(thf)(3)with Li[CH(SiMe3)(2)] afforded the bis and tris(alkyl) ate complexes [Sc{CH(SiMe3)(2)}(2)(mu-Cl)(2)Li(thf)(2)](2)and Sc[CH(SiMe3)(2)](3)(mu-Cl)Li(thf)(3), respectively, in moderate yields. Treatment of these mixed alkyl/chlorido complexes with MeLi gave the mixed alkyl complexes [Sc{CH(SiMe3)(2)}(2)(mu-Me)(2)Li(thf)(2)](2)and Sc[CH(SiMe3)(2)](3)(mu-Me)Li(thf)(3). Aiming at homoleptic {Sc[CH(SiMe3)(2)](3)} both of the mixed [CH(SiMe3)(2)]/Me complexes were treated with AlMe3. Although LiAlMe(4)separation occurred, aluminium complex Al[CH(SiMe3)(2)]Me-2(thf) was the only isolable crystalline complex. Ate complexes [Sc{CH(SiMe3)(2)}(2)(mu-Me)(2)Li(thf)(2)](2)and [Sc(CH2SiMe3)(4)][Li(thf)(4)] revealed the maximum downfield(45)Sc NMR chemical shifts of 888.0 and 933.4 ppm, respectively, reported to date. The synthesis of putative {Sc[CH(SiMe3)(2)](3)} was also attemptedviathe aryloxide route applying complexes Sc(OC(6)H(2)tBu(2)-2,6-Me-4)(3)and [Sc(OC(6)H(3)iPr(2)-2,6)(3)](2)along with Li[CH(SiMe3)(2)] but the outcome was inconclusive. Instead, a cyclic octamer was found for Li[CH(SiMe3)(2)] in the solid state.
机译:取决于所用摩尔比,SCCL3(THF)(3)与Li [CH(SIME3)(2)]的反应得到了双和三(烷基)ATE复合物[SC {CH(SIME3)(2)}( 2)(MU-CL)(2)Li(THF)(2)](2)和SC [CH(SIME3)(2)](3)(MU-CL)LI(THF)(3),以适度的产量。用MELI处理这些混合烷基/氯通络合物,得到混合烷基复合物[SC {CH(SIME3)(2)}(2)(2)(2)Li(THF)(2)](2)和SC [CH(SIME3)(2)](3)(MU-ME)LI(THF)(3)。瞄准{SC [CH(SCE3)(2)](3)}混合的[CH(SIME3)] / ME复合物与ALME3处理。虽然LiAlme(4)分离发生,但铝络合物Al [Ch(Sime3)(2)] Me-2(THF)是唯一可分离的结晶复合物。 ATE复合物[SC {CH(SIME3)(2)}(2)(2)(2)LI(THF)(2)](2)和[SC(CH2SIME3)(4)] [LI(THF) (4)]迄今为止,分别揭示了888.0和933.4 ppm的最大下场(45)SC NMR化学位移。推定{SC [CH(SIME3)(2)](3)}的合成也是催化络合物SC(OC(6)H(2)TBU(2)-2,6-ME-4)的芳氧化物途径( 3)和[Sc(OC(6)H(3)IPR(2)-2,6)(3)](2)以及Li [Ch(Sime3)(2)],但结果不确定。相反,在固态中发现循环八次循环八羟寡克[CH(SIME3)(2)]。

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