中文题名: | 手性联芳香二胺衍生的新型Cu(II)、Ag(I)金属络合物的合成、结构及其在不对称反应中的应用研究 |
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保密级别: | 公开 |
学科代码: | 070303 |
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学生类型: | 硕士 |
学位: | 理学硕士 |
学位年度: | 2011 |
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研究方向: | 金属有机化学 |
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提交日期: | 2011-04-15 |
答辩日期: | 2011-04-15 |
外文题名: | Synthesis, Structure and Catalytic Activity of New Silver(I) and Copper(II) Complexes with Chiral Biaryldiamine-Based Ligands |
中文摘要: |
本论文以手性1,1’-联萘-2,2’-二胺和2,2’-二氨基-6,6’-二甲基-1,1’-联苯为原料合成了4个C1对称性和6个C2对称性的配体。这些手性配体可与后过渡金属化合物CuX2 (X = Cl, ClO4)和AgX (X = NO3, PF6, OTf)反应生成相应的Cu(II)、Ag(I)金属络合物。配体的刚性在Ag(I)络合物的形成过程中起着非常重要的作用。如刚性较小的手性N3-配体(S)-3、(R)-6和(R)-7与0.5当量的AgX反应得到双配体4个N配位的单核金属络合物,而刚性较大的手性N3-配体(R)-8与0.5当量的AgX反应却得到双配体2个N配位的单核金属络合物。刚性N4-配体(R)-9、(S)-11、(S)-13和(R)-15与等当量的AgX反应生成双核双螺旋金属络合物,而柔性N4-配体(R)-10和(S)-12与等当量的AgX反应却得到单核单螺旋金属络合物。手性N3-配体(S)-3、N4-配体(S)-12或(S)-13与等当量的CuX2反应都生成了单配体单核金属络合物。全文所得的10个配体和35个手性金属络合物通过了各种光谱鉴定和元素分析测试,其中1个配体和20个金属络合物的结构还通过了X-单晶衍射证实。手性Ag(I)络合物可用于催化芳香醛的不对称烯丙基化反应,而Cu(II)络合物可用于催化芳香醛的不对称Henry反应。Ag(I)、Cu(II)络合物在这两种反应中分别显示了较好的催化活性,但立体选择性一般。
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外文摘要: |
Four C1-symmetric and six C2-symmetric ligands have been designed and successfully prepared from chiral 1,1’-binaphthyl-2,2’-diamine and 2,2’-diamino-6,6’-dimethyl-1,1’-biphenyl. A series of chiral Ag(I) and Cu(II) complexes have been prepared from the reaction between these ligands and AgX (X = NO3, PF6, OTf) or CuX2 (X = Cl, ClO4), respectively, in good yields. The rigidity of the ligand plays an important role in the Ag(I) complex formation. For example, treatment of chiral N3-ligands (S)-3, (R)-6 and (R)-7 with half equiv of AgX gives the chiral bis-ligated four-coordinated Ag(I) complexes, while ligand (R)-8 affords the two-coordinated Ag(I) complexes. Reaction of AgX with 1 equiv of chiral N4-ligands (R)-9, (S)-11, (S)-13 or (R)-15 gives the chiral, binuclear double helicate Ag(I) complexes, while chiral mononuclear single helicate Ag(I) complexes are obtained with N4-ligands (R)-10 and (S)-12. Treatment of either N3-ligand (S)-3 or N4-ligand (S)-12 or (S)-13 with 1 equiv of CuX2 gives the mono-ligated Cu(II) complexes. All the ligands and complexes have been characterized by various spectroscopic techniques and elemental analyses, and twenty-one of the complexes have been further confirmed by X-ray diffraction analyses. The chiral Ag(I) complexes are active catalysts for asymmetric allylation reaction, and the chiral Cu(II) complexes are active catalysts for asymmetric Henry reaction (nitroaldol reaction), but their enantioselectivities are moderate.
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参考文献总数: | 60 |
馆藏号: | 硕070303/1102 |
开放日期: | 2011-04-15 |