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Related Experiment Videos

Reduction of bis

Horacek1, Stepnicka, Gyepes

  • 1J. Heyrovsky Institute of Physical Chemistry, Academy of Sciences of the Czech Republic, Prague.

Chemistry (Weinheim an Der Bergstrasse, Germany)
|August 12, 2000
PubMed
Summary
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Titanocene dichlorides with pendant alkenyl groups undergo magnesium reduction to form titanacyclopentanes via oxidative coupling. Acidolysis of these titanacycles yields ansa-titanocene dichlorides, with double bond positions influenced by pendant group structure.

Area of Science:

  • Organometallic Chemistry
  • Titanium Chemistry
  • Catalysis

Background:

  • Titanocene dichlorides are versatile organometallic compounds with diverse applications.
  • Pendant alkenyl groups on titanocene complexes offer sites for unique chemical transformations.
  • Understanding the reactivity of titanocene intermediates is crucial for developing new synthetic methodologies.

Purpose of the Study:

  • To investigate the reductive coupling of titanocene dichlorides bearing pendant omega-alkenyl groups.
  • To characterize the resulting titanacyclopentane intermediates and their subsequent reactions.
  • To explore the influence of pendant group structure on the stereochemistry and reactivity of the products.

Main Methods:

  • Reduction of titanocene dichlorides using magnesium in tetrahydrofuran.

Related Experiment Videos

  • Isolation and characterization of titanacyclopentane products using spectroscopic techniques.
  • Acidolysis of titanacyclopentanes with HCl to form ansa-titanocene dichlorides.

    • Main Results:

    • Oxidative coupling of pendant alkenyl groups afforded titanacyclopentanes.
    • Titanacyclopentanes reacted with PbCl2 to regenerate starting materials or isomers.
    • Acidolysis yielded ansa-titanocene dichlorides with varying degrees of unsaturation in the bridging chain.

    Conclusions:

    • The reduction of titanocene dichlorides provides a route to titanacyclopentanes.
    • The structure of the pendant group dictates the outcome of the acidolysis reaction, including double bond isomerization.
    • This study highlights the synthetic utility of titanocene complexes in constructing complex organotitanium structures.