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首页> 外文期刊>Dalton transactions: An international journal of inorganic chemistry >OCO and NCO chelated derivatives of heavier group 15 elements. Study on possibility of cyclization reaction via intramolecular ether bond cleavage
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OCO and NCO chelated derivatives of heavier group 15 elements. Study on possibility of cyclization reaction via intramolecular ether bond cleavage

机译:OCO和NCO螯合的重15类元素衍生物。通过分子内醚键裂解进行环化反应的可能性的研究

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A set of four pincer ligands, either the OCO type ligands L~(1-3) [2,6-(ROCH_2)_2C_6H_3]~-, where R = Me (L~1), mesityl (L~2), t-Bu (L~3) or novel NCO ligand [2-(Me_2NCH_2)-6-(t-BuOCH _2)C_6H_3]~- was studied. The reaction of L~4Li with PCl_3 resulted in isolation of [2-(OCH _2)-6-(Me_2NCH_2)C_6H_3]PCl (1) as a result of intramolecular ether bond cleavage and elimination of t-BuCl. The conversion between the organolithium compounds L~(1,2,4)Li and AsCl_3 led to the desired chlorides, i.e. (L~1) _2AsCl (2), L~2AsCl_2 (3), L~4AsCl _2 (5), but an analogous reaction using the L~3Li compound gave [2-(OCH_2)-6-(t-BuOCH_2)C_6H_3]AsCl (4) as a result of intramolecular cyclization. The organoantimony chloride L~3SbCl_2 was shown to undergo very slow cyclization in CDCl_3 again via elimination of t-BuCl giving [2-(OCH _2)-6-(t-BuOCH_2)C_6H_3]SbCl (6) and it was demonstrated that this reaction may be accelerated by preparation of L ~3Sb(Cl)(OTf) (7) with more Lewis acidic central atom. On the contrary, both antimony derivatives of the NCO ligand L~4, not only the chloride L~4SbCl_2 (8) but also the ionic pair containing highly Lewis acidic cation [L~4SbCl]~+[CB _(11)H_(12)]~- (9), are stable without any indication for etheral bond cleavage. The situation is rather similar in the case of organobismuth derivatives of L~4, which allowed isolation of compounds L~4BiCl_2 (10), L~4Bi(Cl)(OTf) (11) and [L ~4BiCl]~+[CB_(11)H_(12)]~- (12). All studied compounds were characterized by the help of ~1H and ~(13)C NMR spectroscopy, ESI mass spectrometry, elemental analysis and (except 1) by single-crystal X-ray diffraction.
机译:一组四个钳式配体,即OCO型配体L〜(1-3)[2,6-(ROCH_2)_2C_6H_3]〜-,其中R = Me(L〜1),mesityl(L〜2),t研究了-Bu(L〜3)或新型NCO配体[2-(Me_2NCH_2)-6-(t-BuOCH _2)C_6H_3]〜-。 L〜4Li与PCl_3的反应由于分子内醚键的裂解和t-BuCl的消除而导致了[2-(OCH _2)-6-(Me_2NCH_2)C_6H_3] PC1(1)的分离。有机锂化合物L〜(1,2,4)Li和AsCl_3之间的转化产生所需的氯化物,即(L〜1)_2AsCl(2),L〜2AsCl_2(3),L〜4AsCl _2(5),但是,由于分子内环化,使用L〜3Li化合物进行的类似反应得到了[2-(OCH_2)-6-(t-BuOCH_2)C_6H_3] AsCl(4)。通过消除t-BuCl得到[2-(OCH _2)-6-(t-BuOCH_2)C_6H_3] SbCl(6),证明有机锑氯化物L〜3SbCl_2再次在CDCl_3中经历非常缓慢的环化。可以通过制备带有更多路易斯酸性中心原子的L〜3Sb(Cl)(OTf)(7)来加速反应。相反,NCO配体L〜4的两种锑衍生物,不仅氯化物L〜4SbCl_2(8),而且还包含高度路易斯酸阳离子[L〜4SbCl]〜+ [CB _(11)H_( 12)]〜-(9)稳定,没有任何醚键断裂的迹象。对于L〜4的有机铋衍生物,情况相当相似,可以分离出化合物L〜4BiCl_2(10),L〜4Bi(Cl)(OTf)(11)和[L〜4BiCl]〜+ [CB_ (11)H_(12)]〜-(12)。所有研究的化合物均通过〜1H和〜(13)C NMR光谱,ESI质谱,元素分析和(除1外)单晶X射线衍射表征。

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