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Oxidation of Alkenes: Syn Dihydroxylation with Osmium Tetraoxide02:44

Oxidation of Alkenes: Syn Dihydroxylation with Osmium Tetraoxide

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Alkenes are converted to 1,2-diols or glycols through a process called dihydroxylation. It involves the addition of two hydroxyl groups across the double bond with two different stereochemical approaches, namely anti and syn. Dihydroxylation using osmium tetroxide progresses with syn stereochemistry.
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Electron Paramagnetic Resonance (EPR) Spectroscopy: Organic Radicals01:17

Electron Paramagnetic Resonance (EPR) Spectroscopy: Organic Radicals

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Ideally, an unpaired electron shows a single peak in the EPR spectrum due to the transition between the two spin energy states. However, coupling interactions can occur between the spins of the unpaired electron and any neighboring spin-active nuclei. This hyperfine coupling results in hyperfine splitting, where the EPR signal is split into multiplets. The signals split into 2nI + 1 peaks, where n is the number of equivalent nuclei and I is the nuclear spin. These splitting patterns provide...
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Crystal Field Theory - Tetrahedral and Square Planar Complexes02:46

Crystal Field Theory - Tetrahedral and Square Planar Complexes

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Tetrahedral Complexes
Crystal field theory (CFT) is applicable to molecules in geometries other than octahedral. In octahedral complexes, the lobes of the dx2−y2 and dz2 orbitals point directly at the ligands. For tetrahedral complexes, the d orbitals remain in place, but with only four ligands located between the axes. None of the orbitals points directly at the tetrahedral ligands. However, the dx2−y2 and dz2 orbitals (along the Cartesian axes) overlap with the ligands less than the dxy,...
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E2 Reaction: Stereochemistry and Regiochemistry02:43

E2 Reaction: Stereochemistry and Regiochemistry

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Elimination reactions of alkyl halides can yield one or more alkenes depending on the specific regiochemical and stereochemical considerations. While the regiochemistry of the reaction governs the location of the double bond in the product, the stereochemical requirements often influence the geometry.
When a substrate with two different β hydrogens undergoes an E2 elimination, the presence of a strong base can yield two regioisomeric alkenes. The more-substituted alkene is the major...
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Photochemical Electrocyclic Reactions: Stereochemistry01:26

Photochemical Electrocyclic Reactions: Stereochemistry

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The absorption of UV–visible light by conjugated systems causes the promotion of an electron from the ground state to the excited state. Consequently, photochemical electrocyclic reactions proceed via the excited-state HOMO rather than the ground-state HOMO. Since the ground- and excited-state HOMOs have different symmetries, the stereochemical outcome of electrocyclic reactions depends on the mode of activation; i.e., thermal or photochemical.
Selection Rules: Photochemical Activation
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Regioselectivity of Electrophilic Additions-Peroxide Effect02:35

Regioselectivity of Electrophilic Additions-Peroxide Effect

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In the presence of organic peroxides, the addition of hydrogen bromide to an alkene yields the isomer that is not predicted by Markovnikov’s rule. For example, the addition of hydrogen bromide to 2-methylpropene in the presence of peroxides gives 1-bromo-2-methylpropane. This addition reaction proceeds via a free radical mechanism, which reverses the regioselectivity. The free radical reaction mechanism involves three stages: initiation, propagation, and termination.
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Catalytic Reactions at Amine-Stabilized and Ligand-Free Platinum Nanoparticles Supported on Titania During Hydrogenation of Alkenes and Aldehydes
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一个外球两电子试剂的试剂.

Hershel Jude1, Jeanette A Krause Bauer, William B Connick

  • 1Department of Chemistry, University of Cincinnati, Cincinnati, Ohio 45221-0172, USA.

Journal of the American Chemical Society
|March 20, 2003
PubMed
概括
此摘要是机器生成的。

这项研究引入了一种新的复合物,具有独特的联结体结构. 这种设计能够在 (II) 和 (IV) 状态之间轻松进行两电子氧化还原循环,推进合作的外球电子转移试剂的开发.

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科学领域:

  • 无机化学 无机化学
  • 有机金属化学 有机金属化学
  • 电化学 电化学 电化学

背景情况:

  • 设计高效的电子转移试剂对于催化和材料科学至关重要.
  • 复合物因其氧化还原特性而被广泛研究.
  • 外球电子转移机制需要特定的连接体环境.

研究的目的:

  • 展示设计合作的外球双电子试剂的策略.
  • 合成和表征一种新的 (II) 复合物,具有独特的型联结体.
  • 为了研究合成复合物的电化学行为和氧化还原能力.

主要方法:

  • 一种新的 (II) 复合物的合成,[Pt (tpy) (pip2NCN) ][BF4].
  • 复合物的质子化形成[Pt(tpy) ((pip2NCNH2) ]][PF6]3.3.
  • 使用1H NMR光谱学和X射线晶体学进行结构性表征.
  • 通过循环电压计进行电化学分析.

主要成果:

  • 新的 (II) 复合体,[Pt (tpy) (pip2NCN) ][BF4],已经成功地准备好.
  • 质子化产生了一个稳定的 (II) 复合体,具有明显的连接体协调模式.
  • 循环电压测量揭示了两个可逆的单电子还原波和一个几乎可逆的双电子氧化波.
  • 该复合物促进了Pt (II) 和Pt (IV) 氧化状态之间轻松的相互转换.

结论:

  • 复合物的不寻常的连接体结构稳定了多个氧化状态.
  • 这种设计策略是有效的,用于创建合作的外球两电子试剂.
  • 这些发现为开发新的电催化系统和氧化还原活性材料打开了道路.