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Palladium N-Heterocyclic Carbene Complexes: Synthesis from Benzimidazolium Salts and Catalytic Activity in Carbon-carbon Bond-forming Reactions
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1D-3D Coordination Polymers Based on M4Cu4‑Phenylsilsesquioxane (M = K, Rb, Cs) Cages: Synthesis, Structure, and

Grigorii S Astakhov1, Alexander V Bachinskiy2, Victor N Khrustalev2,3

  • 1Key Lab of Colloid and Interface Chemistry, Ministry of Education, School of Chemistry and Chemical Engineering, Shandong University, Jinan, Shandong 250100, China.

ACS Omega
|May 18, 2026
PubMed

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Valence Bond Theory

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Isomerism in Complexes
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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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