A stable bis(methylene)-λ<sup>4</sup>-selane with a >CSeC< bond containing Se(<scp>iv</scp>)
作者:K. Sugamata、Y. Urao、M. Minoura
DOI:10.1039/c9cc04121d
日期:——
Bis(methylene)-λ4-selane 1, which represents a new class of heteroallenes, was synthesized and isolated as a stable purple crystalline solid. X-ray crystallographic analysis revealed a bent allene-type structure with pseudo C2v symmetry and a bent CSeC moiety that contains a 3-center-4-electron π-bond. The NMRspectrum of 1 shows compelling evidence for a slow rotation of the SeC moieties at room temperature
双(亚甲基)-λ 4 -selane 1,它代表了一类新的heteroallenes,合成并分离为稳定的紫色结晶固体。X射线晶体学分析显示具有假C 2v对称性的弯曲的艾伦型结构和包含3个中心4电子π键的弯曲的C Se C部分。的NMR谱1示出了令人信服的证据为硒的缓慢旋转在室温温度下部分。的77的硒NMR谱1包含硒(区域特性一个信号IV)的化合物。
Synthesis and Structure of a Stable Bis(methylene)-λ<sup>4</sup>
-sulfane
extraordinary stability. The molecular structure and electron‐density distribution of 1 were analyzed by single‐crystal X‐ray diffraction analysis, which revealed a bent C=S=C geometry with C=S=C π‐bonds. These results, combined with those of variable‐temperature NMR measurements and theoretical calculations suggest a slow rotation of the S=C moieties in 1, the stability and structure of which were further examined
双(亚甲基)-λ 4 -sulfane 1,一个> C = S = C <杂累接双键,获得从元素硫和包含空间要求的甲硅烷基的卡宾之间的反应的红色结晶固体。在大气条件下,甚至在高温下,1也表现出非凡的稳定性。通过单晶X射线衍射分析法分析了1的分子结构和电子密度分布,结果显示了弯曲的C = S = C几何结构和C = S = Cπ键的结构。这些结果与变温NMR测量结果和理论计算相结合,表明S = C部分在1中的旋转较慢。通过理论计算进一步研究了其稳定性和结构。
A Linear C=Ge=C Heteroallene with a Di‐coordinated Germanium Atom**
2-germapropadiene adopts a linear structure in solution and the solid state: It has a formally sp-hybridized central germaniumatom and two orthogonal C=Ge π-bonds. The linear geometry arises from the negative hyperconjugation of the bulky silyl substituents at the terminal carbon atoms. The germaniumatom is highly electrophilic and the allene-type character of the molecule is fully characterized and confirmed
contains multiple bonds between carbon and tellurium. This compound is the first example of bis(methylene)-λ4-tellane, which was synthesized and fully characterized using multinuclear NMR spectroscopy and X-ray crystallography. In the solid state, this λ4-tellane exhibits a bent allene structure for the C═Te═C moiety and unsaturated Te–C bonds. Interestingly, the allene-type structure is retained in the solution
Synthesis and Structural Analysis of Organic Cyclic Polyselenides Obtained from the Reaction of a Bissilylcarbenoid with Selenium
作者:Koh Sugamata、Teppei Asakawa、Mao Minoura
DOI:10.1002/ejic.202200780
日期:——
The synthesis and structural analysis of three organic cyclic polyselenides was accomplished by treating a bissilylcarbenoid with selenium. The tetraselenane, tetraselenolane, and the hexaselenepane can be synthesized selectively by controlling the reaction temperature and the stoichiometry of selenium.