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Updated: Nov 2, 2025

Accessing Valuable Ligand Supports for Transition Metals: A Modified, Intermediate Scale Preparation of 1,2,3,4,5-Pentamethylcyclopentadiene
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Accessing Valuable Ligand Supports for Transition Metals: A Modified, Intermediate Scale Preparation of 1,2,3,4,5-Pentamethylcyclopentadiene

Published on: March 20, 2017

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超重サイクロプロペンの移行金属複合体:非デワー-チャット-ダンカンソン調整と容易なSiGe機能化

Paresh Kumar Majhi1, Michael Zimmer1, Bernd Morgenstern1

  • 1Krupp-Chair of General and Inorganic Chemistry, Saarland University, 66123 Saarbrücken, Germany.

Journal of the American Chemical Society
|June 9, 2021
PubMed
まとめ

研究者らは,新種のシリコン-ゲルマニウムサイクロプロペンを合成し,移行金属サイクロプロペンの複合体のより重い類型である. これらの化合物は,有機金属化学における結合に関する新しい洞察を提供します.

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The Diels–Alder reaction is an example of a thermal pericyclic reaction between a conjugated diene and an alkene or alkyne, commonly referred to as a dienophile. The reaction involves a concerted movement of six π electrons, four from the diene and two from the dienophile, forming an unsaturated six-membered ring. As a result, these reactions are classified as [4+2] cycloadditions.
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Cycloadditions are one of the most valuable and effective synthesis routes to form cyclic compounds. These are concerted pericyclic reactions between two unsaturated compounds resulting in a cyclic product with two new σ bonds formed at the expense of π bonds. The [4 + 2] cycloaddition, known as the Diels–Alder reaction, is the most common. The other example is a [2 + 2] cycloaddition.
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Thermal cycloadditions are reactions where the source of activation energy needed to initiate the reaction is provided in the form of heat. A typical example of a thermally-allowed cycloaddition is the Diels–Alder reaction, which is a [4 + 2] cycloaddition. In contrast, a [2 + 2] cycloaddition is thermally forbidden.
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