Syntheses, Structures, and Reactivities of Homometallic Rare-Earth-Metal Multimethyl Methylidene and Oxo Complexes

Syntheses, Structures, and Reactivities of Homometallic Rare-Earth-Metal Multimethyl Methylidene and Oxo Complexes
复制标题

同质金属稀土金属多甲基亚甲基和氧配合物的合成、结构和反应性。

DOI:
10.1002/chem.201002670
复制
发表时间:
2011-01-01
影响因子:
4.3
通讯作者:
Zhou, Xigeng
Zhou, Xigeng
中科院分区:
化学2区
文献类型:
--
作者:
Hong, Jianquan;Zhang, Lixin;Zhou, Xigeng

文献摘要

被引文献

相似文献

非溶剂化的三核均四稀土金属多甲基亚甲基配合物[{(NCN)Ln(mu(2)-CH 3)}(3)(mu(3)-CH 3)(mu(3)-CH 2)](NCN=L=[PhC{NC6H4(iPr-2,6)(2)}(2)](-); Ln=Sc(2a),Lu(2b))的合成方法是在室温下用2当量的AlMe 3与[(L)Ln{CH_2C_6 H_4 N(CH_3)(2)-o}(2)](Ln=Sc(1a),Lu(1b))反应。1与3当量的AlMe_3反应,得到了三核异金属配合物[(L)Ln(AlMe_4)(2)](Ln=Sc(3a),Lu(3b))。有趣的是,2也可以通过3在THF/甲苯中重结晶产生,从而表明THF分子也可以诱导2的C-H键活化。2与1当量酮反应,以高产率得到三核同金属氧代三甲基配合物[{(L)Ln-(mu(2)-CH 3)}(3)(mu(3)-CH 3)(mu(3)-O)](Ln=Sc-(4a),Lu(4 b))。配合物4 b与1当量的环己酮反应得到甲基提取产物[{(L)Lu(mu(2)-CH 3)}(3)(mu(3)-OC 6 H9)(mu(3)-O)](5 b),而4 b与苯乙酮反应形成插入产物[{(L)Lu(mu(2)-CH 3)}(3){mu(3)-OCPh(CH 3)(2)}(mu(3)-O)](6 b)。配合物4a在相同条件下对酮呈惰性。所有这些新的配合物都通过元素分析、核磁共振谱和X射线衍射测定进行了表征。
Unsolvated, trinuclear, homometallic, rare-earth-metal multimethyl methylidene complexes [{(NCN)Ln(mu(2)-CH3)}(3)(mu(3)-CH3)(mu(3)-CH2)] (NCN=L=[PhC{NC6H4(iPr-2,6)(2)}(2)](-); Ln=Sc (2a), Lu (2b)) have been synthesized by treatment of [(L)Ln{CH2C6H4N(CH3)(2)-o}(2)] (Ln=Sc (1a), Lu (1b)) with two equivalents of AlMe3 in toluene at ambient temperature in good yields. Treatment of 1 with three equivalents of AlMe3 gives the heterometallic trinuclear complexes [(L)Ln (AlMe4)(2)] (Ln=Sc (3a), Lu (3b)) in good yields. Interestingly, 2 can also be generated by recrystallization of 3 in THF/toluene, thereby indicating that the THF molecule can also induce C-H bond activation of 2. Reaction of 2 with one equivalent of ketones affords the trinuclear homometallic oxo trimethyl complexes [{(L)Ln-(mu(2)-CH3)}(3)(mu(3)-CH3)(mu(3)-O)] (Ln=Sc-(4a), Lu(4b)) in high yields. Complex 4b reacts with one equivalent of cyclohexanone to give the methyl abstraction product [{(L)Lu(mu(2)-CH3)}(3)(mu(3)-OC6H9)(mu(3)-O)] (5b), whereas reaction of 4b with acetophenone forms the insertion product [{(L)Lu(mu(2)-CH3)}(3){mu(3)-OCPh(CH3)(2)}(mu(3)-O)] (6b). Complex 4a is inert to ketone under the same conditions. All these new complexes have been characterized by elemental analysis, NMR spectroscopy, and confirmed by X-ray diffraction determination.