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Aldol Condensation vs Claisen Condensation01:33

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Aldol condensation is an acid or base-catalyzed condensation between aldehydes or ketones to give an α,ꞵ-unsaturated carbonyl compound. A base-promoted condensation between ester molecules to produce a ꞵ-ketoester is known as the Claisen condensation. In the presence of a base, both reactions involve deprotonation of the acidic α hydrogen to produce the corresponding enolates. The nucleophilic enolates attack their respective nonenolized carbonyl compound forming a tetrahedral...
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Cyanohydrins are compounds that contain –CN and –OH groups on the same carbon atom. They are formed by the nucleophilic addition of the cyanide ions to the carbonyl group. Cyanide ions are highly basic and nucleophilic and can be generated from HCN under aqueous conditions. However, since HCN is a weak acid, the number of cyanide ions generated is very small. Hence, a small amount of base or KCN/NaCN is added to HCN to increase the concentration of the cyanide ions in the reaction...
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Benzaldehyde, like formaldehyde, lacks an α hydrogen and cannot enolize to form an enolate. Hence, the reaction of benzaldehyde with a ketone in the presence of an aqueous base forms a single crossed product. This reaction is referred to as Claisen–Schmidt condensation.
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A second monoclinic polymorph of ferrocenecarboxaldehyde.

Jamal Lasri1, Yaseen A Almehmadi1,2, Naser E Eltayeb1,3

  • 1Department of Chemistry Rabigh College of Science and Arts King Abdulaziz University,Jeddah 21589 Saudi Arabia.

Acta Crystallographica. Section E, Crystallographic Communications
|April 9, 2026
PubMed
Summary
This summary is machine-generated.

This study details the crystal structure of a ferrocenecarboxaldehyde polymorph, revealing distinct molecular arrangements and intermolecular interactions like hydrogen bonding and pi-pi stacking that influence crystal packing.

Keywords:
Hirshfeld surfacecrystal structureferrocenecarboxaldehydehydrogen bondπ-stacking

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Area of Science:

  • Organometallic Chemistry
  • Crystallography
  • Solid-State Chemistry

Background:

  • Ferrocenecarboxaldehyde is an organometallic compound with potential applications in materials science.
  • Polymorphism in ferrocenecarboxaldehyde can lead to different physical and chemical properties.
  • Understanding crystal packing is crucial for predicting material behavior.

Purpose of the Study:

  • To characterize a novel polymorph of ferrocenecarboxaldehyde, designated as compound (I).
  • To elucidate the crystal structure, including molecular conformation and intermolecular interactions.
  • To compare the crystal packing of this polymorph with previously reported forms.

Main Methods:

  • Single-crystal X-ray diffraction was used to determine the crystal structure of compound (I).
  • Analysis of bond lengths, bond angles, and intermolecular interactions (hydrogen bonds, π-π stacking, C-H⋯π interactions).
  • Hirshfeld surface analysis was employed to quantify the contributions of different interactions to crystal packing.

Main Results:

  • Compound (I) crystallizes in the P21 space group with two independent ferrocenecarboxaldehyde molecules in the asymmetric unit.
  • Significant differences in C-O bond lengths and O-C-C bond angles were observed between the two independent molecules.
  • The crystal structure is stabilized by C-H⋯O hydrogen bonds, π-π stacking, and C-H⋯π(ring) interactions.
  • Hirshfeld surface analysis revealed H⋯H, H⋯C/C⋯H, and H⋯O/O⋯H interactions as dominant contributors to crystal packing.

Conclusions:

  • The characterized polymorph exhibits unique crystallographic features compared to previously known forms.
  • Intermolecular interactions play a significant role in the consolidation of the crystal lattice.
  • The crystal packing is efficient, with minimal void space, indicating a stable solid-state structure.