取代苯酚中共振增强的分子内氢键

根据晶体结构资料，计算了59个邻位取代苯酚中分子内氢键的几何．在STO－3G水平上计算了一些分子中原子部分电荷．结果表明，酚基氧与苯环上碳之间的键长，酚基上氢原子的部分电荷，酚基所在位置处的苯环环内角与取代苯酚的酸常数pKa均有近似线性关系，当邻位上存在硝基或羰基时，内氢键由于共振而得到显著的增强，据此可说明这一类酚的显著酸性     

微波照射合成不对称1，4－二氢吡啶的研究

微波照射合成不对称１，４－二氢吡啶的研究张雅文，沈宗旋，潘备，杨海康，陆新华，陆澄容（苏州大学化学系苏州２１５００６）关键词缩合，二氢吡啶，微波Ｈａｎｔｚｓｃｈ合成是制备１，４－二氢吡啶的经典方法。这一合成的改进方法之一是３－氨基巴豆酸酯与醛和乙酰乙...     

新的桥联二氨基镱(II)配合物[{Me2Si(NPh)2Yb(THF)2}(m3-Cl)(m4-Cl){Li(THF)}2]2·2THF的合成及结构

无水YbCl₃与等当量的Li₂Me₂Si(NPh)₂在四氢呋喃中反应，生成了相应的镱(III)氯化物1 [{Me₂Si(NPh)₂Yb}(m2-Cl)(TMEDA)]₂·3PhMe （TMEDA = 四甲基乙二胺）。原位形成的配合物1经Na-K合金还原，高产率地得到了一个新的、分子中有四个LiCl络合的桥联二氨基镱(II)配合物2 [{Me₂Si(NPh)₂Yb(THF)₂}(m3-Cl)(m4-Cl){Li(THF)}2]2·2THF。这两个配合物经过X-射线的结构表征证实均为二聚体。配合物1中两个镱原子经氯桥连接成一个扭曲的八面体。配合物2中两个[Me₂Si(NPh)₂Yb(THF)₂](m3-Cl)[Li(THF)]₂结构单元经两个m4-Cl原子连接成一个“椅式”骨架。     

β-亚磺酰基-N,N-二正丁基丙酰胺的合成研究

利用过氧化氢氧化β-硫烷基-N,N-二正丁基丙酰胺合成了6个未见文献报道的β-亚磺酰基-N,N-二正丁基丙酰胺,并对产物进行了红外、氢核磁、质谱和元素分析等表征.最后用β-亚磺酰基-N,N-二正丁基丙酰胺进行了硝酸介质中萃取稀土离子的研究.     

A Novel Divalent Ytterbium Complex Supported by a Bridged Diamide Ligand： Synthesis and Structure of [{Me2Si（NPh ）2Yb（THF）2}（μ3-CI）（μ4-CI）{Li（TH F） }2]2·2THF

The reaction of anhydrous YbCl3 with 1 equiv, of Li2Me2Si（NPh）2 in THF, after workup, yielded a ytterbium（Ⅲ） chloride [{Me2Si（NPh）2Yb}（μ2-CI）（TMEDA）]2·3PhMe （1） （TMEDA=tetramethylethanediamine）. The same reaction followed by treatment with Na-K alloy afforded a new ytterbium（H） complex supported by a bridged diamide with four coordinated LiC1 molecules, [{Me2Si（NPh）2Yb（THF）2}（μ3-CI）（μ4-CI）{Li（THF）}2]2·2THF （2） in high yield. Both complexes were structurally characterized by X-ray analysis to be dimers. Complex 1 was a chlorine-bridged dimer with ytterbium in a distorted octahedral geometry. In complex 2 two [Me2Si（NPh）2Yb（THF）2]- （μ3-CI）[Li（THF）]2 moieties were connected with each other by two μ4-CI bridges to form a ＂chair-form＂ framework.     

α-亚磺酰基-N,N-二取代酰胺的简便合成

合成了6个未见文献报道的α-亚磺酰基-N，N-二取代酰胺，比较了使用各种氧化剂将α-烷硫基-N，N-二取代酰胺氧化成目标分子的条件，从而提供了一条简捷的合成路线。     

Cooperative C-H…O H-bonds in ''Bay Area'' and Crystal Structure of 1-(4-Methylphenyl)- 3-(4-methoxyphenyl)-2-propene-1-one

The title compound (C17H16O2, Mr = 252.30) crystallizes in the monoclinic system, space group P21/c with a = 11.5763(14), b = 11.0321(11), c = 11.5094(13) (A),β = 114.581(3)°, V= 1336.7(3) (A)3, Z = 4, Dc = 1.254 g/cm3, μ(MoKa) = 0.081 cm-1 and F(000) = 536.00. The final R and wR are 0.0527 and 0.1285, respectively for 3058 observed reflections (I ＞ 2σ(I)). In the title molecule, two phenyl rings are rotated oppositely with respect to the central part C(1)-C(2)=C(3)- C(4) (plane 3) and the dihedral angle between them is 14.8°. The phenone O(1) atom deviates from plane 3 by 0.291(A). In the crystal the molecules form H-bond chains of R21(6) and R21 (5) types similar crystals are also presented.