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Preparation and Reactions of Sulfides02:26

Preparation and Reactions of Sulfides

Sulfides are the sulfur analog of ethers, just as thiols are the sulfur analog of alcohol. Like ethers, sulfides also consist of two hydrocarbon groups bonded to the central sulfur atom. Depending upon the type of groups present, sulfides can be symmetrical or asymmetrical. Symmetrical sulfides can be prepared via an SN2 reaction between 2 equivalents of an alkyl halide and one equivalent of sodium sulfide.
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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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The Diels–Alder reaction brings together a diene and a dienophile to form a six-membered ring. Both components have unique characteristics that influence the rate of the reaction.
Characteristics of the diene
Conformation
The simplest example of a diene is 1,3-butadiene, an acyclic conjugated π system. At room temperature, the molecule exists as a mixture of s-cis and s-trans conformers by virtue of rotation around the carbon–carbon single bond. Although the s-trans isomer is more stable, the...
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Acyclic diene metathesis polymerization or ADMET polymerization involves cross-metathesis of terminal dienes, such as 1,8-nonadiene, to give linear unsaturated polymer and ethylene. As ADMET is a reversible process, the formed ethylene gas must be removed from the reaction mixture to complete the polymerization process.
Similar to cross-metathesis, ADMET also involves the formation of metallacyclobutane intermediate by [2+2] cycloaddition of one of the double bonds of a terminal diene with...

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Ferrocen-yl(meth-yl)diphenyl-silane.

Yu-Peng Liu1, Zong-Qi Li, Yong-Xia Tan

  • 1Beijing National Laboratory for Molecular Sciences (BNLMS), Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, People's Republic of China.

Acta Crystallographica. Section E, Structure Reports Online
|July 15, 2011
PubMed
Summary
This summary is machine-generated.

This study details the structural analysis of a novel iron complex, [Fe(C5H5)(C18H17Si)], revealing specific bond distances and angles. Crystal packing in this organometallic compound is primarily influenced by van der Waals forces.

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Area of Science:

  • Organometallic Chemistry
  • Coordination Chemistry
  • Solid-State Chemistry

Background:

  • Organometallic compounds containing iron and cyclopentadienyl (Cp) ligands are crucial in catalysis and materials science.
  • Understanding the precise structural parameters of these complexes is essential for predicting their reactivity and properties.

Purpose of the Study:

  • To characterize the molecular structure of the iron complex [Fe(C5H5)(C18H17Si)] using crystallographic methods.
  • To determine the distances between the iron atom and the centroids of the substituted and unsubstituted cyclopentadienyl rings.
  • To analyze the dihedral angle between the two cyclopentadienyl rings and investigate the crystal packing forces.

Main Methods:

  • Single-crystal X-ray diffraction was employed to determine the three-dimensional structure of the title molecule.
  • Analysis of bond lengths, bond angles, and intermolecular interactions within the crystal lattice.

Main Results:

  • The distances from the iron atom to the centroids of the unsubstituted and substituted cyclopentadienyl rings were found to be 1.651(1) Å and 1.646(1) Å, respectively.
  • The dihedral angle between the two cyclopentadienyl rings was measured at 3.20(17)°.
  • Crystal packing analysis indicated that van der Waals forces are the primary stabilizing interactions.

Conclusions:

  • The structural data provides a detailed understanding of the coordination environment around the iron center in this specific organometallic complex.
  • The observed structural parameters are consistent with known trends for related metallocene derivatives.
  • The dominance of van der Waals forces in crystal packing highlights the importance of non-covalent interactions in the solid state of such compounds.