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相关概念视频

Organic Compounds03:02

Organic Compounds

All living things are formed mostly of carbon compounds called organic compounds. The category of organic compounds includes both natural and synthetic compounds that contain carbon. Although a single, precise definition has yet to be identified by the chemistry community, most agree that a defining trait of organic molecules is the presence of carbon as the principal element, bonded to hydrogen and other carbon atoms. However, some carbon-containing compounds such as carbonates, cyanides, and...
Exceptions to the Octet Rule02:55

Exceptions to the Octet Rule

Many covalent molecules have central atoms that do not have eight electrons in their Lewis structures. These molecules fall into three categories:
Hybridization of Atomic Orbitals II03:35

Hybridization of Atomic Orbitals II

sp3d and sp3d 2 Hybridization
Chirality at Nitrogen, Phosphorus, and Sulfur02:30

Chirality at Nitrogen, Phosphorus, and Sulfur

Chirality is most prevalent in carbon-based tetrahedral compounds, but this important facet of molecular symmetry extends to sp3-hybridized nitrogen, phosphorus and sulfur centers, including trivalent molecules with lone pairs. Here, the lone pair behaves as a functional group in addition to the other three substituents to form an analogous tetrahedral center that can be chiral.
A consequence of chirality is the need for enantiomeric resolution. While this is theoretically possible for all...
¹³C NMR: Distortionless Enhancement by Polarization Transfer (DEPT)01:20

¹³C NMR: Distortionless Enhancement by Polarization Transfer (DEPT)

When proton-coupled carbon-13 spectra are simplified by a broadband proton decoupling technique, structural information about the coupled protons is lost. Distortionless enhancement by polarization transfer (DEPT) is a technique that provides information on the number of hydrogens attached to each carbon in a molecule. While the DEPT experiment utilizes complex pulse sequences, the pulse delay and flip angle are specifically manipulated. The resulting signals have different phases depending on...
Nomenclature of Aromatic Compounds with Multiple Substituents01:11

Nomenclature of Aromatic Compounds with Multiple Substituents

When more than one substituent is present on the benzene ring, the IUPAC nomenclature depends on the number of substituents present.
For disubstituted benzene derivatives, with two groups attached to the benzene ring, three constitutional isomers are possible. For example, consider dimethyl benzene, often called xylene, where the second methyl group can be substituted at the second, third, or fourth carbon. The relative position of the substituents is represented by prefixes ortho, meta, or...

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相关实验视频

Updated: Jul 10, 2026

Synthesis of Nine-atom Deltahedral Zintl Ions of Germanium and their Functionalization with Organic Groups
08:15

Synthesis of Nine-atom Deltahedral Zintl Ions of Germanium and their Functionalization with Organic Groups

Published on: February 11, 2012

八二烯和十二二三烯.

Jun Lu1, Jiajia Zhang, Xianfeng Shen

  • 1Department of Chemistry, Princeton University, Princeton, New Jersey 08544, USA.

Journal of the American Chemical Society
|July 4, 2002
PubMed
概括

研究人员合成了八二烯和两种新型四二二聚合物,包括一个高度拥挤的二二三. X射线结晶学揭示了独特的结构,其中二甲三烯与溶酸盐形成通道结构.

科学领域:

  • 有机化学 有机化学
  • 材料科学 材料科学 材料科学
  • 晶体学 晶体学是指结晶学.

背景情况:

  • 甲是具有独特反应性的应变基因.
  • 合成高度替代的多环芳 (PAH) 提出了重大挑战.
  • 了解二元的结构多样性对于探索新的化学空间至关重要.

研究的目的:

  • 为了合成和描述四乙的新型二次体.
  • 研究高度拥挤的多环芳的结构性质.
  • 探索具有新型PAH结构的纳入化合物的形成.

主要方法:

  • 3,4,5,6-tetraphenylanthranilic 酸的二化,以形成八二烯.
  • 从商业前体中合成1,2,3,4,5,6,7,8-八烯.
  • 四乙与八乙二甲二甲二甲二甲二甲二甲二甲二甲二甲二甲二甲二甲二甲二甲二甲二甲二甲二甲三甲二甲二甲二甲二甲二甲二甲二甲二甲三甲二甲二甲二甲二甲二甲三甲二甲二甲二甲二甲二甲二甲二甲二甲二甲二甲二甲二甲二甲二甲二甲二甲二甲二甲二甲二甲二甲三甲二甲二甲二甲二甲二甲二甲二甲二甲二甲二甲二甲二甲二甲二甲二甲二甲二甲二甲二甲二甲二甲二甲二甲二甲二甲三甲二甲二甲二甲二甲二甲二甲二甲二甲二甲二甲二甲二甲二甲二甲二甲二甲二甲二甲二甲二甲二甲二甲二甲二甲二甲二甲二甲二甲二甲二甲二甲二甲二甲二甲二甲二甲二甲二甲二甲二甲二甲二
  • 合成化合物和溶酸盐的结构确定X射线晶体学.

主要成果:

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Synthesis of Antiviral Tetrahydrocarbazole Derivatives by Photochemical and Acid-catalyzed C-H Functionalization via Intermediate Peroxides (CHIPS)
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Synthesis of Antiviral Tetrahydrocarbazole Derivatives by Photochemical and Acid-catalyzed C-H Functionalization via Intermediate Peroxides (CHIPS)

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Modification and Functionalization of the Guanidine Group by Tailor-made Precursors

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Published on: February 11, 2012

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  • 八乙烯是四乙的预期二聚体,以低产量合成.
  • 一个异常的二元体,1,2,3,8,9,10-hexaphenyldibenzo[fg,op]naphthacene,一个形的PAH,被确定和结构性特征.
  • 合成了最拥挤的三基衍生物,1,2,3,4,5,6,7,8,13,14,15,16-多德基三基.
  • 二甲三烯非烯溶酸盐的X射线结构揭示了一种含的道结构,单位细胞中含的比例超过50%.

结论:

  • 四乙二聚体的合成表明了多样化的反应途径.
  • 新型PAHs的结构特征扩展了分子架构的知识.
  • 纳入化合物的形成突出了复杂有机框架的宿主-客人化学的潜力.