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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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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...
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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...
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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...
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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.
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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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Reversible haptotropic shift in zirconocene-hexapentaene complexes.

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
Summary

Low-valent zirconocene complexes react with hexapentaenes to form zirconacyclopentynes and eta2-pi-coordinated complexes. Interconversion between these species and proposed isocyanide insertion mechanisms were observed.

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Area of Science:

  • Organometallic Chemistry
  • Zirconium Chemistry
  • Organic Synthesis

Background:

  • Low-valent zirconocene complexes are versatile reagents in organic synthesis.
  • Hexapentaenes are unique unsaturated hydrocarbons with potential for diverse reactivity.
  • Understanding the coordination chemistry of zirconocene with polyenes is crucial for developing new synthetic methodologies.

Purpose of the Study:

  • To investigate the reaction of low-valent zirconocene species with 1,1,6,6-tetraalkyl-1,2,3,4,5-hexapentaenes.
  • To characterize the resulting organozirconium complexes and explore their interconversion.
  • To elucidate the mechanism of isocyanide insertion into zirconacyclopentynes.

Main Methods:

  • Reaction of low-valent zirconocene complexes with tetraalkyl-hexapentaenes.
  • Spectroscopic characterization (NMR, X-ray crystallography) of the formed complexes.
  • Mechanistic studies including observation of haptotropic interconversion and proposed intermediates.

Main Results:

  • Formation of both 1-zirconacyclopent-3-ynes and eta2-pi-coordinated complexes, dependent on alkyl groups and ligands.
  • Observation of haptotropic interconversion between the two types of zirconocene complexes.
  • Proposal of a mechanism for double isocyanide insertion involving an eta2-pi-complex intermediate.

Conclusions:

  • The reaction of low-valent zirconocenes with hexapentaenes yields distinct organozirconium species.
  • Haptotropic rearrangements play a key role in the interconversion of these complexes.
  • A plausible mechanism for isocyanide insertion into zirconacyclopentynes has been proposed, highlighting the role of eta2-pi-complex intermediates.