2.3-Dioxo-1.4-diphenyl-piperazin | 858850-94-9

• 分子结构分类: 有机化合物 - 有机杂环化合物 - 吲哚及其衍生物
• 英文名称: 2.3-Dioxo-1.4-diphenyl-piperazin
• 英文别名: 1,4-diphenyl-piperazine-2,3-dione；1,4-Diphenyl-piperazin-2,3-dion；1,4-Diphenylpiperazine-2,3-dione
• CAS: 858850-94-9
• 化学式: C₁₆H₁₄N₂O₂
• 分子量: 266.299
• InChiKey: XWIFUJNTMQSVHU-UHFFFAOYSA-N

物化性质

• 熔点：
  263-265 °C(Solv: ethanol (64-17-5))
• 沸点：
  405.8±28.0 °C(Predicted)
• 密度：
  1.268±0.06 g/cm3(Predicted)

计算性质

• 辛醇/水分配系数(LogP)：
  2.5
• 重原子数：
  20
• 可旋转键数：
  2
• 环数：
  3.0
• sp3杂化的碳原子比例：
  0.12
• 拓扑面积：
  40.6
• 氢给体数：
  0
• 氢受体数：
  2

反应信息

• 作为反应物：
  描述：

  2.3-Dioxo-1.4-diphenyl-piperazin 在 劳森试剂 作用下， 以 甲苯 为溶剂， 生成
  参考文献：
  名称：

  卤素键介导的自由基反应：哌嗪基二硫代草酰胺配体在二碘存在下的意外行为

  摘要：

  N , N'-二烷基哌嗪-2,3-二硫酮（R 2 pipdt）被认为是一类六原子环状二硫代草酰胺配体，对贵金属阳离子和二碘等软电子受体具有独特的电荷转移供体特性。现在，后一种相互作用更好地描述为卤素键合。在与二碘的反应中，R 2 pipdt 出乎意料地提供了相应的三碘化物盐，与其他二硫代草酰胺不同，其通常获得配体·nI 2卤素键合加合物。在本文中，我们报告了一项实验和理论相结合的研究，可以阐明所引用产品的性质以及这些配体不可预测行为背后的原因。具体来说，对一系列合成获得的 R 2 pipdt (R = Me, Pr, Bz)/I 3盐进行低温单晶 X 射线衍射测量，并辅以中子衍射实验，能够通过实验突出显示[R 2 pipdtH] +连二硫酸部分上带有 -S–H 键的阳离子。不同的是，当R = Ph时，获得由配体的分子内缩合反应产生的苯并噻唑鎓阳离子。基于密度泛函理论（DFT）计算，提出了一

  DOI：

  10.1021/acs.inorgchem.2c02340
• 作为产物：
  描述：

  1,4-diphenylpiperazin-2-one 在 铬酸 、 溶剂黄146 作用下， 生成 2.3-Dioxo-1.4-diphenyl-piperazin
  参考文献：
  名称：

  Bischoff; Nastvogel, Chemische Berichte, 1890, vol. 23, p. 2026

  摘要：

  DOI：

文献信息

• Crown architecture in Quercus petraea and Q. robur: the fate of buds and shoots in relation to age, position and environmental perturbation
  作者：G.H. Bicl-Sorlin

  DOI：10.1093/forestry/73.4.331

  日期：2000.4.1

  Shoot and bud dynamics of peripheral crown portions of mature pedunculate and sessile oak trees ( Quercus robur L., Q. petraea (Matt.) Liebl.) were monitored over almost three vegetation periods. The formation and shedding of buds and extension units (eus) was mapped in the form of simplified drawings. Branches were additionally subjected to manipulative treatments simulating herbivore (defoliation at different times, loss of certain bud types) and abiotic damage (artificial acid rain) and the effects on branch architecture analysed. Branch characteristics, such as branching order and age structure, had a large influence on the growth and dynamics of peripheral branch portions, even greater than that of the manipulative treatments, with the exception of spring defoliation and shoot tip removal, which led to increased shoot shedding. In order to quantify the observed changes in crown structure with time, new measures were introduced: the shedding ratio corresponds to the number of shed eus divided by the total number of eus present and produced since a given starting point. The vitality ratio was defined as the total number of eus produced in 1 year, divided by the total number of eus shed during the same time. The vitality ratio could thus be – on a small scale – the quantitative measure of Roloff's vitality classes (Roloff, 1987, 1988, 1989).

  成熟的白栎（Quercus robur L.）和山栎（Q. petraea (Matt.) Liebl.）树木周边树冠部分的抽枝和芽动态在近三个生长季内进行了监测。芽的形成和脱落以及延伸单位（eu）的变化以简化的图形形式进行了记录。枝条还受到模拟 herbivore（在不同时间进行的落叶、某些芽类型的丧失）和非生物损伤（人工酸雨）的操作性处理，并分析了对枝条结构的影响。枝条特征，如分枝顺序和年龄结构，对周边枝条部分的生长和动态有很大影响，甚至超过了操作性处理的影响，春季落叶和顶芽去除除外，这两者导致了芽的脱落增加。为了定量观察到的树冠结构随时间变化的新措施被提出：脱落比率对应于脱落的eu数量与自给定起点以来存在和产生的eu总数的比值。活力比率被定义为在1年内产生的eu总数除以同一时间内脱落的eu总数。因此，活力比率可以在小范围内作为Roloff的活力等级的定量衡量标准（Roloff, 1987, 1988, 1989）。
• Catalyst system for enhanced stereo-specificity of olefin polymerization and method for producing olefin polymer
  申请人：Formosa Plastics Corporation, USA

  公开号：US10822438B2

  公开（公告）日：2020-11-03

  Disclosed are a catalyst component for olefin polymerization comprising titanium, magnesium, a halogen, internal donors, in combination with a silane and oxalic acid diamides of the following formula: An olefin polymerization catalyst system consisting of the solid catalyst component, an organoaluminum compound, and an optional external electron donor compound is also disclosed. Employment of both oxalic acid diamides and silane component in the presence of internal electron donors as an elements of solid Ziegler-Natta type catalyst composition enhances stereo-specificity while maintaining excellent catalyst activity and hydrogen response, in which the modified catalyst composition produces polypropylene with good productivity and higher stereo-specificity than catalyst composition without such modification.

  本发明公开了一种用于烯烃聚合的催化剂组分，该组分由钛、镁、卤素、内部供体与硅烷和下式草酸二酰胺组成： 还公开了一种烯烃聚合催化剂体系，由固体催化剂组分、有机铝化合物和任选的外部电子供体化合物组成。在内部电子供体存在的情况下，同时使用草酸二酰胺和硅烷组分作为固体齐格勒-纳塔型催化剂组合物的元素，可提高立体特异性，同时保持优异的催化剂活性和氢响应，与未进行此类改性的催化剂组合物相比，改性催化剂组合物生产的聚丙烯具有良好的生产率和更高的立体特异性。
• Complementation of Biotransformations with Chemical C–H Oxidation: Copper-Catalyzed Oxidation of Tertiary Amines in Complex Pharmaceuticals
  作者：Julien Genovino、Stephan Lütz、Dalibor Sames、B. Barry Touré

  DOI：10.1021/ja405471h

  日期：2013.8.21

  The isolation, quantitation, and characterization of drug metabolites in biological fluids remain challenging. Rapid access to oxidized drugs could facilitate metabolite identification and enable early pharmacology and toxicity studies. Herein, we compared biotransformations to classical and new chemical C-H oxidation methods using oxcarbazepine, naproxen, and an early compound hit (phthalazine 1). These studies illustrated the low preparative efficacy of biotransformations and the inability of chemical methods to oxidize complex pharmaceuticals. We also disclose an aerobic catalytic protocole (CuI/air) to oxidize tertiary amines and benzylic CH's in drugs. The reaction tolerates a broad range of functionalities and displays a high level of chemoselectivity, which is not generally explained by the strength of the C-H bonds but by the individual structural chemotype. This study represents a first step toward establishing a chemical toolkit (chemotransformations) that can selectively oxidize C-H bonds in complex pharmaceuticals and rapidly deliver drug metabolites.
• Bischoff; Nastvogel, Chemische Berichte, 1889, vol. 22, p. 1805
  作者：Bischoff、Nastvogel

  DOI：——

  日期：——
• Bischoff; Trapesonzjanz, Chemische Berichte, 1892, vol. 25, p. 2932
  作者：Bischoff、Trapesonzjanz

  DOI：——

  日期：——