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[3,3] Sigmatropic Rearrangement of 1,5-Dienes: Cope Rearrangement01:21

[3,3] Sigmatropic Rearrangement of 1,5-Dienes: Cope Rearrangement

3.5K
The Cope rearrangement is classified as a [3,3] sigmatropic shift in 1,5-dienes, leading to a more stable, isomeric 1,5-diene. The reaction involves a concerted movement of six electrons, four from two π bonds and two from a σ bond, via an energetically favorable chair-like transition state.
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Thermal Sigmatropic Reactions: Overview01:16

Thermal Sigmatropic Reactions: Overview

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Sigmatropic rearrangements are a class of pericyclic reactions in which a σ bond migrates from one part of a π system to another. These are intramolecular rearrangements where the total number of σ and π bonds remain unchanged.
Sigmatropic shifts are classified based on an order term [i, j ], where i and j indicate the number of atoms across which each end of the σ bond migrates. Below are examples of a [3,3] sigmatropic shift in 1,5-hexadiene, referred...
2.6K
Colors and Magnetism03:02

Colors and Magnetism

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Color in Coordination Complexes
When atoms or molecules absorb light at the proper frequency, their electrons are excited to higher-energy orbitals. For many main group atoms and molecules, the absorbed photons are in the ultraviolet range of the electromagnetic spectrum, which cannot be detected by the human eye. For coordination compounds, the energy difference between the d orbitals often allows photons in the visible range to be absorbed and emitted, which is seen as colors by the human...
14.2K
Woodward–Hoffmann Selection Rules and Microscopic Reversibility01:34

Woodward–Hoffmann Selection Rules and Microscopic Reversibility

4.1K
Electrocyclic reactions, cycloadditions, and sigmatropic rearrangements are concerted pericyclic reactions that proceed via a cyclic transition state. These reactions are stereospecific and regioselective. The stereochemistry of the products depends on the symmetry characteristics of the interacting orbitals and the reaction conditions. Accordingly, pericyclic reactions are classified as either symmetry-allowed or symmetry-forbidden. Woodward and Hoffmann presented the selection criteria for...
4.1K
Thermal and Photochemical Electrocyclic Reactions: Overview01:26

Thermal and Photochemical Electrocyclic Reactions: Overview

3.1K
Electrocyclic reactions are reversible reactions. They involve an intramolecular cyclization or ring-opening of a conjugated polyene. Shown below are two examples of electrocyclic reactions. In the first reaction, the formation of the cyclic product is favored. In contrast, in the second reaction, ring-opening is favored due to the high ring strain associated with cyclobutene formation.
3.1K
Thermal Electrocyclic Reactions: Stereochemistry01:17

Thermal Electrocyclic Reactions: Stereochemistry

2.6K
The stereochemistry of electrocyclic reactions is strongly influenced by the orbital symmetry of the polyene HOMO. Under thermal conditions, the reaction proceeds via the ground-state HOMO.
Selection Rules: Thermal Activation
Conjugated systems containing an even number of π-electron pairs undergo a conrotatory ring closure. For example, thermal electrocyclization of (2E,4E)-2,4-hexadiene, a conjugated diene containing two π-electron pairs, gives trans-3,4-dimethylcyclobutene.
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Author Spotlight: Functionalizing Metal-Organic Frameworks: Advancements, Challenges, and the Power of Post-Synthetic Ligand Exchange
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ジルコノセン-ヘクサペンタエンの複合体における可逆ハプトトロピクシフト

Noriyuki Suzuki1, Daisuke Hashizume, Hajime Yoshida

  • 1Advanced Technology Support Division, RIKEN Advanced Science Institute, 2-1 Hirosawa, Wako-shi, Saitama 351-0198, Japan.

Journal of the American Chemical Society
|November 5, 2008
PubMed
まとめ

低価値ジルコノセンの複合体はヘキサペンタエンと反応してジルコナサイクロペンチンとエタ2-ピ-調整複合体を形成する. これらの種間の相互変換と,提案されたイソシアニド挿入メカニズムが観察されました.

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Line Shape Analysis of Dynamic NMR Spectra for Characterizing Coordination Sphere Rearrangements at a Chiral Rhenium Polyhydride Complex
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科学分野:

  • 有機金属化学 有機金属化学
  • ジルコニア化学 ジルコニア化学
  • オーガニック・シンセシス オーガニック・シンセシス

背景:

  • 低値ジルコノコーセンの複合体は,有機合成における多用途の反応剤である.
  • ヘキサペンタエンは,多様な反応性を持つ可能性のあるユニークな不飽和炭化水素です.
  • ジルコノコーセンのポリエネとの連携化学を理解することは,新しい合成方法論の開発に不可欠です.

研究 の 目的:

  • 1,1,6,6-テトラアルキル-1,2,3,4,5-ヘキサペンタエンの低値ジルコノセンの種の反応を調査する.
  • その結果生じるオーガノジルコニウム複合体を特徴付け,その相互変換を調査する.
  • ジルコナサイクロペンチネスにアイソシアニドを挿入するメカニズムを解明する.

主な方法:

  • 低値ジルコノコーセンの複合体とテトラアルキル-ヘキサペンタエンの反応.
  • 形成された複合体のスペクトル学的特徴付け (NMR,X線結晶学).
  • ハプトトロピック相互変換と提案された中間物質の観察を含むメカニズム研究.

主要な成果:

  • アルキル基とリガンドに依存する,1-ジルコナサイクロペン-3-イネとエタ2-ピ-調整複合体の形成.
  • 2種類のジルコノセーン複合体間のハプトトロピック相互変換の観察.
  • Eta2-pi複合体の中間物質を含む二重イソシアニド挿入のためのメカニズムの提案.

結論:

  • 低値ジルコノセノとヘキサペンタエンの反応により,異なるオルガノジルコニウム種が生じる.
  • ハプトロプ的再配置は,これらの複合体の相互変換において重要な役割を果たします.
  • ジルコナcyclopentynesにイソシアニドの挿入のための合理的なメカニズムが提案されており,eta2-pi-複合体の中間物質の役割を強調しています.